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P8010-034 exam Dumps Source : Tealeaf Technical Mastery Test v1

Test Code : P8010-034
Test cognomen : Tealeaf Technical Mastery Test v1
Vendor cognomen : IBM
: 38 existent Questions

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IBM Tealeaf Technical Mastery Test

IBM to tender DB2 Mastery examination - 2 | killexams.com existent Questions and Pass4sure dumps

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IBM particulars Channel Plans For Netezza statistics Warehouse appliances | killexams.com existent Questions and Pass4sure dumps

records warehouse appliances

The circulation will supply resellers with a number of sales, advertising and marketing and technical components that IBM talked about will compose it more convenient to market and sell Netezza methods. IBM is too providing new financing options to channel companions who resell the Netezza home equipment, together with zero-p.c financing and versatile saturate options for valued clientele.

while Netezza generally offered its information warehouse appliances direct to purchasers, IBM has had its eye on the channel for promoting Netezza items considering it got the enterprise in November for $1.7 billion. at the Netezza person conference in June IBM executives unveiled a companion recruitment application for Netezza and referred to they call the channel to account for 50 percent of Netezza earnings within four years.

"business analytics goes mainstream and IBM's goal is to arm its companions with the preempt skills and wait on to aid their valued clientele retract erudition of this fashion," referred to Arvind Krishna, typical manager of IBM suggestions management, in an announcement. "These &#ninety one;new&#ninety three; components are geared to compose it effortless for their companions to quickly infuse Netezza into their enterprise mannequin."

IBM has identified business analytics as considered one of its strategic initiatives and has forecast that company analytics and optimization products and features will generate $sixteen billion in annual income for the business by means of 2015.

Netezza's techniques are according to IBM's BladeCenter servers.

Channel partners requisite to exist licensed to resell IBM products that foster below the software value Plus (SVP) program. Authorization necessities include having at the least two personnel who've handed a technical mastery exam and one who has passed a revenue mastery exam.

Resellers who qualify for the SVP application are eligible for co-advertising money for lead generation and other market planning counsel. IBM too offers companions a handicap bootcamp where personnel can train on how to install, manage and preserve Netezza programs. And SVP-member resellers can convey earnings prospects into IBM Innovation centers to examine-force Netezza products.

starting Oct. 1 the Netezza products too will foster under IBM's software value Incentive application, which gives economic rewards for companions who determine and develop revenue alternatives, but execute not necessarily address product fulfillment.

On the financing facet partners can present zero-p.c financing through IBM international Financing to credit-qualified purchasers for Netezza purchases. too accessible is 24- and 36-month financing with alternatives that let purchasers in shape payments to anticipated money flows.

And partners can lease a Netezza system for 24 months to rush inside their personal facts facilities for demonstration, construction, testing and training purposes, IBM said.

Charlotte, N.C.-based mostly solutions company and IBM companion Fuzzy Logix, which supplies predictive analytics utility and capabilities to shoppers, "will exercise these components from IBM to ascertain international business alternatives and bring larger expense capabilities to their shoppers," stated COO Mike Upchurch, in an announcement.


IBM pursuits commercial enterprise BYOD with MobileFirst | killexams.com existent Questions and Pass4sure dumps

commercial enterprise mobility is turning into a huge deal and IBM is itching to prove that it exist on the case.

The IT items and features colossal today debuted its MobileFirst portfolio and pledged to double the company's investments in cellular this year. MobileFirst encompasses a suite of cell offerings that huge Blue is gathering under the MobileFirst umbrella. They include cellular equipment administration, analytics and cellular developer outreach and sheperd in partnership with AT&T.

The goal, based on Robert LeBlanc, senior vp of IBM middleware application, is to shepherd the bring your own machine (BYOD) circulate into an era of enterprise-enabled mobility. "thus far, cell computing has been dominated by means of discussions of recent smartphones, working methods, games and apps. however businesses occupy yet to faucet into the capabilities of mobile enterprise," he said in a company observation.

If iOS and Android smartphones and tablets just relish the iPad aren’t already an integral piece of the ordinary workday, they soon might be, says IBM.

https://o1.qnsr.com/log/p.gif?;n=203;c=204660774;s=9478;x=7936;f=201812281339040;u=j;z=TIMESTAMP;a=20403972;e=i

LeBlanc brought, "As these devices spin into ingrained in every thing that they do, agencies are actually in the palms of their customers' palms. IBM MobileFirst is designed to compose the transformation to fitting a cell enterprise a reality."

In aid of that imaginative and prescient, IBM unveiled a unified solutions set, deliverable by the exercise of the cloud or as managed capabilities, to assist enterprises combine mobility into their IT setups and business methods.

IBM's newly-introduced cellular slate includes updates to IBM Worklight, the cell applications platform that the business acquired closing year. elements include solitary signal-on for diverse purposes and a new Rational scrutinize at various Workbench beta for mobile app trying out.

On the cell equipment management (MDM) front, IBM announced multiplied equipment sheperd and security updates for Endpoint manager. A refreshed edition of AppScan provides vulnerability testing for iOS apps.

IBM is counting on tech from yet another acquisition, Tealeaf, for cell analytics. The company plans to expand its Tealeaf CX cell visual analytics product to deliver organizations a window into mobile behaviors.

functions additionally play a huge role. MobileFirst course and Design services are anchored by course of IBM Interactive, the business's new mobile Maturity model assessment carrier and new mobile Workshops to assist customers speed up their tasks. when it comes to establishing and managing cellular environments, IBM is enlisting the better community Infrastructure services for cell, mobile enterprise functions for Managed Mobility and mobile application Platform administration instruments.

Recognizing that builders can compose or smash a cell ecosystem, the company has cast a partnership with AT&T that allows for coders to integrate features relish speech focus and quick funds by course of IBM Worklight and AT&T's cloud APIs. IBM is additionally pouring technical documentation into on-line supplies developerWorks and CodeRally.

Pedro Hernandez is a contributing editor at InternetNews.com, the information provider of the IT business piece community, the community for know-how experts. keep him on Twitter @ecoINSITE.

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    Declassified documents tender a new perspective on Yuri Gagarin’s flight | killexams.com existent questions and Pass4sure dumps

      Gagarin launch

    The launch of Vostok on April 12, 1961. A declassified document offers new information on what happened during Gagarin’s flight.

    by Asif SiddiqiMonday, October 12, 2015 Bookmark and Share

    As anyone who has done research on the topic knows, there’s an abundance of bewildering information about the Soviet space program, both in print and especially online. During the cold War, Westerners generally had itsy-bitsy to travel on, but enterprising professional sleuths chipped away at the edifice of secrecy, thus bringing to light many of its darkest secrets. The conclude of the cold War brought a deluge of information on the program, most of it filtered through Russian journalists who were superb at tracking down veterans willing to talk. The result was a kindly of revisionist history, a history concerned with “what really happened” rather than “what they thought happened.”

    Despite sum this quite impressive work, the principal challenge of doing Soviet space history has always been the problem of archival research. How execute you travel about digging into archives in Moscow to procure at the documents, as one is able to execute (for example) with the American space program?

    With Russian openness, a huge market opened up in the US and Europe for writers (mostly professional historians or journalists) to step in and produce an unending stream of books on arcane aspects of the program. This strand has been further enriched by academics—mostly professional historians of modern Russia—who occupy looked at the affluent cultural detritus of the Soviet space program. There’s a lot of this stuff out there, and some of it is very good, shedding light on the cultural significance of the Soviet space program as well as mapping how Russian culture has cultivate an interest in space exploration for well over a hundred years. (For those interested, I moderated a very arresting discussion on Soviet space culture a yoke of years ago on the Russian History Blog.)

    Gagarin launch

    Gagarin being led to his spaceship at the top of the gantry by Oleg Ivanovsky who was the “lead” (production) designer of the Vostok spaceship.

    Despite sum this quite impressive work, the principal challenge of doing Soviet space history has always been the problem of archival research. How execute you travel about digging into archives in Moscow to procure at the documents, as one is able to execute (for example) with the American space program? Since the early 1990s, it has actually been viable to visit archives in Moscow and procure access to Party and government documents at various condition archives. It’s not easy, but it can exist done and there are many academics, both professors and graduate students, who routinely execute research at Russian archives on a huge array of topics related to Soviet history. I myself occupy been in Moscow many times (including for months at a time) working at various archives for my engage on the pre-Sputnik history of the Soviet space program.

    Of course, as with any archival document, one has to occupy a captious eye and contextualize, evaluate, and weigh any document by drawing from other sources. Nevertheless, the availability of archival documents on the Soviet space program has been both a boon and source of confusion. Russian archival authorities, for example, published several collections of primary source documents in 2011 on the early days of the space program (all in Russian) which are now commercially available (I’ve written brief summaries of some of them in this NASA Newsletter, pp. 19–24) but at the selfsame time, there is undoubtedly some selection jaundice in what has been included and what has been omitted. Selection jaundice is, of course, a problem with any published collection of archival documents but the Russian ones foster with their own peculiar set of problems.

    It was in this context that I was in Moscow this past summer and spent a month digging through archives on a non-space related engage project (actually on the history of scientists and engineers who worked in the Stalinist Gulag). I had a few days left at the conclude and went digging for space-related documents. At the Russian condition Archive of the Economy (RGAE), one can find thousands of fleshy binders containing records of the grim-sounding Military-Industrial Commission, the carcass that managed Soviet military R&D and production during much of the cold War. These folders are heavy, dusty, and for the most part, no one has looked at them since they were originally consequence away by archivists. The richness of materials is quite astonishing. Over the past few years, I occupy organize and collected an huge amount of material on the space program and related fields. These include: plans and schedules for their interplanetary program; minute lists of technical materials from the American aerospace industry coveted by Soviet industrial managers; documents complaining that secrecy at Baikonur (the site from where the Soviets launched their satellites and cosmonauts) was not strict enough; abandoned anti-satellite projects; and documents on their massive N-1 Moon program.

    Gagarin launch

    Ivanovsky helping Gagarin procure settled in his ship.

    In this catalog of riches, in June of this year, I ran across a document on the historic flight of famed cosmonaut Yuri Gagarin, who on April 12, 1961, became the first human being in space. The document sheds new light on that historical flight, revealing the huge risks involved in that mission. Gagarin’s Vostok flight, of course, has been quite amply documented, in print and online (with quite a nice recent biography in English by Andrew Jenks). I myself published a lengthy account, based largely on official mission documents (released in 1991), in one my earlier books, Challenge to Apollo: The Soviet Union and the Space Race, 1945–1974. However, documents occupy continued to trickle out on the flight in the past decade, and while nothing that has been declassified fundamentally shifts their perception of the mission, the Russian declassifications from 2011 occupy clarified much about the flight. The document that I organize too provides confirmation of certain aspects of the flight, which is sum the more essential given the proliferation of Gagarin collusion websites (especially in Russian) which are effortless to find with a Google search. Many websites will command you that Gagarin was not the first human in space, that there were earlier “lost cosmonauts,” and, most sensationally, that his untimely death in 1968 was piece of some nefarious Communist Party plan.

    The document underscores what has often been overlooked by casual historians—that the flight of Gagarin’s Vostok was fundamentally embedded in a military environment. His spaceship was actually an offshoot variant of a new spy satellite (“Zenit”), not, as many often claim, that the spy satellite was the offshoot of the human variant.

    The text of my document was remarkably somber in tone, very much in line with Soviet bureaucratic norms. Its title a literal description of its contents: “On the Results of the Launch of the ‘Vostok’ Space Ship with a Human on Board and on Plans for Future work on Launches of the ‘Vostok’ Space Ship.” What was this? It was the official summary report—classified “Top Secret”—on Gagarin’s mission prepared by designers for the highest levels of the Soviet government. This five-page summary report, produced on May 9, 1961, less than a month after Gagarin’s flight, briefly compiled sum that engineers knew about the flight. How did Gagarin do? How well did his spaceship perform? What can they execute next?

    For a start, they can cashier the notion that Gagarin was not well during the flight. The authors of the document note that “Cosmonaut Major Yu. A. Gagarin normally bore the effects of sum the factors accompanying the insertion of [his] ship into orbit, the space flight, and the recrudesce to Earth, maintaining replete working aptitude during the flight and fully completed the flight assignment and program of observation.”

    The document underscores what has often been overlooked by casual historians—that the flight of Gagarin’s Vostok was fundamentally embedded in a military environment. His spaceship was actually an offshoot variant of a new spy satellite (“Zenit”), not, as many often claim, that the spy satellite was the offshoot of the human variant. Engineers basically took out the cameras from the spy satellite, added life support, an ejection seat, and redundancies, and rigged the spacecraft for a human being. Besides the document’s observation about a “program of observation,” they procure an definite confirmation of the military significance of Gagarin’s flight in the next sentence, when the authors note that the flight has “opened up new prospects in the mastery of cosmic space and the exercise of these objects for the interests of defense.”

    Gagarin launch

    The “USSR” insignia was not originally on Gagarin’s helmet but was painted on on the morning of his flight.

    Despite the obvious note of self-congratulation about the flight (“all systems ensuring the insertion into orbit, flight in orbit, and recrudesce of the recrudesce module and the cosmonaut [back] to Earth, worked normally”) the document notes there were numerous “basic shortcomings” during the preparation and implementation of the mission. Going through these they procure a rare and peculiar glimpse into the cold War Soviet space program and its functioning in a climate of lofty stakes and incredibly lofty risk.

    We find from the document that during the preparation of two precursor missions with dogs in March 1961, and then in manufacturing Gagarin’s actual vehicle, at least 70 anomalies were detected in instruments on the vehicle. Yet, still, the flight went ahead!

    Second, the “air conditioning” (basically, the life support system on Vostok) “did not fully correspond to the [design] requirements,” meaning that life support was essentially operating at its limits for Gagarin.

    We too know that there were a few other “anomalies” (in NASA parlance) that marred the mission, including one that potentially could occupy killed Gagarin.

    Third, the “portable emergency reserve” (in Russian, known as NAZ for nosimyy avariynyy zapas), a package used by cosmonauts to survive (for about three extra days) in case of landing in an unexpected area, was insufficiently debugged, especially for emergency splashdowns, which was certainly a possibility. In fact, the document notes that after being ejected from his capsule after his solitary orbit, when Gagarin was parachuting down, “the cable connected to the [portable emergency reserve] snapped,” basically depriving him of these supplies. In other words, if he had actually landed course off target, he would occupy had to survive without any supplies.

    Fourth, a key valve in an engine (known variously as the 8D719, RD-0109, or RO-7) on two upper stages was assembled incorrectly at the factory, which, the document notes, “could occupy led to a premature shutdown of the engine and [failure] of orbital insertion of the [spaceship].” One imagines the outcome for Gagarin if that had happened. The best case scenario was an unscheduled landing, perhaps in eastern Siberia, on the initial portion of the orbital ground track. The worst case, given sum the unknowns, was a fatality. In fact, as I picture below, this particular valve and its operation during orbital insertion did consequence Gagarin’s life in solemn jeopardy, but not in the course one might expect.

    Fifth, the short-wave mode for the voice radio-communication system (known as “Zarya”) basically did not “provide for prevalent communications during flight of the cosmonaut with ground communication stations,” which explains the repeated complaints by both the ground and Gagarin of difficulty in hearing each other, not to mention the destitute quality of the audio that has been released by Russian archivists.1 Yet, Gagarin recorded some vivid impressions of his time in orbit on a tape recorder in existent time. (“The flight is proceeding marvelously. The emotion of weightlessness is no problem, I feel fine… At the edge of the Earth, at the edge of the horizon, there’s such a shapely blue halo that becomes darker the farther it is from the Earth…”)

    Sixth, one of the two onboard radar sensors (known as “Rubin”), which helped the ground track the coordinates of the spaceship, did not work during Gagarin’s flight. This meant that tracking data during the mission was spotty at best.

    Finally, the spaceship’s main data recorder (a kindly of “black box”) known as “Mir-V1” did not work during reentry and landing due to “unsound assembly” at the factory. This meant that much captious data on the final portion of Gagarin’s mission was simply never recorded, making troubleshooting after the mission that much harder.

    document cover

    Front page of the document organize at an archive in Moscow reporting on the results of Gagarin's flight to government leaders.

    We too know that there were a few other “anomalies” (in NASA parlance) that marred the mission, including one that potentially could occupy killed Gagarin. During launch into orbit, the upper stage engine worked longer (the faulty valve!) than it should have, putting Gagarin in a much higher orbit than planned—the apogee of the orbit was 327 kilometers instead of 230 kilometers. This meant that in case the retrorocket system failed, Gagarin’s ship would not naturally putrefy after a week or so, or even after ten days—the absolute confine of resources in the ship. It would instead reenter after 30 days, by which time Gagarin would certainly exist dead, having exhausted sum the air inside. In other words, either the retrorocket worked, or Gagarin was a departed man.

    In his postflight report, he remembered, “I waited for separation. There was no separation.”

    During the actual flight, as soon as orbital insertion occurred, a timer known as Granit-5V activated. Precisely 67 minutes later, this timer sent a signal to fire the retrorocket engine (known as the S5.4) which, basically, did its job and deorbited Gagarin. In retrospect, that the retrorocket engine fired as it was intended to execute is not terribly surprising given that it was one of the most ground-tested elements of the entire spaceship—17 out of 18 ground firings before the launch were successful. An arresting aside to sum this is that during the entire time he was in space, Gagarin had no concept he was in the wrong orbit.

    A much bigger problem occurred when, having ignited, the retrorocket engine stopped firing after 44 seconds, one second before the planned shutdown time due to another faulty valve. That one second meant that Gagarin would land 300 kilometers short of the planned target point. The want of a proper shutdown too meant that some remaining propellant from the retro-engine (as well as residual gas from the gas bottles of the attitude control system) consequence Gagarin’s ship in an uncontrolled spin (of about 30° per second). Gagarin, as affable as always, reported on this in his later postflight report as a “corps de ballet” as the spaceship madly spun around. He remembered that it was “head, then feet, head, then feet, rotating rapidly. Everything was spinning around. Now I descry Africa… next the horizon, then the sky… I was wondering what was going on.”

    The problem, however, was much more solemn than anyone could occupy anticipated, for the unexpected spin disrupted the internal program that would occupy immediately (four to eight seconds after engine shutdown) led to separation of the two modules that made up the Vostok spaceship: the spherical descent module carrying Gagarin, and the conical instrument module, which lacked a heat shield but ideally would burn up separately far from Gagarin’s capsule. In his postflight report, he remembered, “I waited for separation. There was no separation.” Instead, shackled to each other, the two objects began to enter the atmosphere as one. This was highly dangerous, for parts of the module not designed to survive reentry could occupy easily impacted and blown through Gagarin’s capsule. Fortunately for Gagarin, about ten minutes later, the two parts of Vostok separated, at an altitude of about 150–170 kilometers above the Mediterranean. That was lower than usual, but soundless lofty enough that Gagarin’s capsule was unharmed. And even then sum was not safe. For a few seconds, a wiring harness kept the two modules connected, in a wild dance, separating only when four steel strips attaching the harness came off.

    After experiencing about 10–12 g’s during reentry, Gagarin, once in the atmosphere, ejected from his capsule at an altitude of approximately seven kilometers. However, he soon discovered that once his primary great parachute deployed, the reserve parachute, slightly smaller than the primary one, too partially deployed. Fortunately, descending with one fully deployed parachute and one partial one—a recipe for cataclysm in a worst case scenario—did not adversely finger his descent. Gagarin was, however, busy with other problems: for six minutes, as he descended, he struggled to open a respiration valve on his spacesuit to wait on him breathe atmospheric air. His life was not in danger but it must occupy been extremely uncomfortable for a few tense minutes. Luckily, null the worse for the wear, he parachuted down safely at 1053 Moscow Time (not at 1055, as thought for decades).

    he many problems that Gagarin faced on his mission were not necessarily due to destitute design or tainted engineering, I would argue, but instead a combination of expedition and destitute workmanship on the factory floor. I would quarrel that the Vostok design was in fact excellent engineering if they define “excellent engineering” as too being incredibly robust.

    What does this sum mean? Gagarin was an incredibly lucky man to occupy foster out of this unhurt and alive. In rushing to accomplish a human spaceflight in the race with the US, Soviet engineers pushed the border of acceptable risk to its limits. Fortunately for Soviet planners everything went well. Sure, some of this was due to luck. Things that could occupy gone wrong didn’t. But some of it was too the undeniably robust design of the Vostok spaceship itself. Its relatively simple and elegant design was intended first and foremost to procure a person into orbit and back as quickly and reliably as possible. The Soviets, for example, bypassed a slightly more intricate blunt, truncated cone design (such as used on NASA’s Mercury spacecraft) in favor of a simple sphere capable of ballistic reentry into the Earth’s atmosphere.

    The many problems that Gagarin faced on his mission were not necessarily due to destitute design or tainted engineering, I would argue, but instead a combination of expedition and destitute workmanship on the factory floor. respect that the Vostok spacecraft consisted of 241 vacuum tubes, more than 6,000 transistors, 56 electric motors, and about 800 relays and switches connected by about 15 kilometers of cable. In addition, there were 880 plug connectors, each (on average) having 850 contact points. A total of 123 organizations, including 36 factories, contributed parts to the entire Vostok system. Despite redundancy in a great number of systems, human-rating such a spacecraft with absolute self-confidence was practically impossible. Yet, the course that Soviet engineers designed the system, it was meant to operate even at the blurry edges where parameters were pushed to the max. It is because of this that I would quarrel that the Vostok design was in fact excellent engineering if they define “excellent engineering” as too being incredibly robust.

    The problem with Vostok was not the design itself but that it was insufficiently tested. There were too many bugs in the system that could occupy been eliminated in a slower testing program. But the frantic pace of the “space race” ensured that you had to sacrifice thorough ground testing in favor of debugging the technology in space. This means that you automatically expand the risk to human subjects on board spaceships. Extended ground testing versus flight testing is a tough call for mission managers, and depending on the urgency (as in Apollo 8, for example), you sometimes execute something on the mission that you haven’t really tested on the ground—or can’t test at all.

    What sum this tells us is that while “good engineering” has some objective measures for evaluation, they too requisite to interpolate context into the equation. The question is not simply, “Will it procure the job done?” The question is, “Will it procure the job done, on time, and even if lots of things travel wrong?” And in Gagarin’s case, the respond was obviously “yes.” Regardless of sum the troubles on his mission, he will always exist the first human being in space. You can’t retract that away.

    Endnote
  • Basically, UHF communications with Gagarin were maintained from the second he entered the capsule to about 23 minutes after launch. After that, they switched to short-wave, from various ground stations. But Novosibirsk and Alma-Ata received no word from Gagarin, while Khabarovsk maintained two-way communication for only four minutes (from 09:53 to 09:57 Moscow Time), and Moscow for a minute or so (beginning 10:13 Moscow Time).
  • General References
  • “On the Results of the Launch of the ‘Vostok’ Space Ship with a Human on Board and on Plans for Future work on Launches of the ‘Vostok’ Space Ship” (May 9, 1961) [in Russian], Russian condition Archive of the Economy (RGAE), fond 298, opis’ 1, delo 2057, ll. 249-253.
  • Asif A. Siddiqi, Challenge to Apollo: The Soviet Union and the Space Race, 1945–1974 (Washington, DC: NASA History Office, 2000).
  • L. V. Uspenskaya, ed., Chelovek. Korabl’. Kosmos: sbornik dokumentov i materialov k 50-letiyu poleta v kosmos Yu. A. Gagarina (Moscow: Novyy khronograf, 2011).

  • Key Takeaway Points and Lessons scholarly from QCon London 2015 | killexams.com existent questions and Pass4sure dumps

    Now in its ninth consecutive year, QCon London 2015 featured thought-provoking and engaging keynotes from "Eloquent Ruby” author Russ Olsen, Cobalt Advisors managing colleague Enyo Kumahor, Principal Software Engineer, Google Infrastructure John Wilkes, and Netflix Insight Engineering Manager Roy Rapoport.

    This was the largest London QCon yet with 1,200 team leads, architects, and project managers attending 120 technical sessions across 19 concurrent tracks and 13 in-depth tutorials. Attendees had near instant access to video from nearly sum of the sessions.

    This article summarizes the key takeaways and highlights from QCon London 2015 as blogged and tweeted by attendees. Over the course of the coming months, InfoQ will exist publishing most of the conference sessions online, including video interviews that were recorded by the InfoQ editorial team.  The publishing schedule can exist organize on the QCon London web site. You can too descry numerous photos of QCon on Flickr.

    Training

    Keynotes

    Tracks and Talks

    Architecture Improvements

    Architectures You've Always Wondered About

    Big Data Frameworks, Architectures, and Data Science

    Devops and Continuous Delivery: Code Beyond the Dev Team

    Docker, Containers and Application Portability

    Engineering Culture

    Evolving Agile

    HTML And JS Today

    Internet of Things

    Java - Not departed Yet

    Modern CS in the existent World

    Product Mastery

    Reactive Architecture

    Taming Microservices

    Taming Mobile

    The travel Language

    Sponsored Solutions Track

    Opinions about QCon

    Takeaways

    Conclusion

    Design & Implementation of Microservices

    by James Lewis

    Twitter feedback on this training session included:

    @fotuzlab: Experimentation is the key #qconlondon #microservices http://t.co/CLUI5HWabz

    Java 8 Lambda Expressions & Streams

    by Raoul-Gabriel Urma

    Twitter feedback on this training session included:

    @dsommerville_nw: Impressed with lambdas and course references in #java8 so far - far less boilerplate and MUCH more readable. #qconlondon

    Cluster Management at Google

    by John Wilkes

    Will Hamill attended this keynote:

    John Wilkes … got straight into the examples of starting up services on Google’s internal cloud. birth with a simple ‘hello world’ service, John then created a cluster configuration request for 10,000 instances.

    10,000 was the number picked because this is the default maximum in a ‘cell’, a unit of management of clusters. Only 9993 were actually started as some had failed, or more commonly some machines had been taken down for OS upgrades (a rolling scheduled process), or for various other reasons the exact upper confine was not reached, but closely enough to exist dependable and at this scale you start to procure an appreciation for how inevitable and continuous failures will exist in piece of the network. John gave us stats collected that witness that on a 2000 machine cluster, you can anticipate to occupy > 10 crashes per day.

    This appreciation leads to having more design discussions about reliability; about what happens if something fails while doing maintenance or upgrades, as resilience and fault tolerance are initially more desirable than focusing design application on speed - as at these resource levels animal compel can compose up for speed in the short term. John too repeated the remark that they should “treat servers relish cattle, not pets”, as while your evolution laptop is likely to exist treated relish a precious snowflake, the machines you deploy upon can exist automatically created and destroyed much more easily. When the jobs/services you are developing occupy to tolerate faults in this way, it means that migrating tasks from one machine to another is departed simple: exterminate it and start up a new one elsewhere….

    All of this deployment management, metering, reallocation, live experimentation and such is only available to the teams because Google has made such an investment in monitoring. John impressed the significance upon the audience: “If you are not monitoring it, it is out of control”. …

    As demonstrated during the keynote, everything in Google internally runs on containers. Seeing the upcoming schedule, John said of Docker “we don’t exercise it internally, as they occupy their own system, but they really relish it”. Google occupy too published the Kubernetes project, a implement for managing clusters of containerised applications that looks really interesting. Asked about when the utility of Kubernetes kicks in, John replied “If you’re going to execute one or two or three containers just exercise Docker. Kubernetes helps you manage things if you occupy hundreds.” …

    John ended the keynote by summarising with a call for incremental improvement, proverb that the likelihood for success and edifice momentum is much higher than a big-bang project: “roofshot is better than moonshot”. John left us with three points to finish:

  • Resilience is more essential than performance
  • It’s okay to exercise other people’s stuff, don’t execute it sum yourself
  • Do more monitoring
  • Twitter feedback on this keynote included:

    @Helenislovely: #qconlondon "we want their developers to exist productive not jump through authorization hoops" sounds superb @google

    @andyhedges: At google devs can spin up their code on up to 10,000 nodes without permission. They want their devs to exist productive #qconlondon

    @alblue: So Google's internal system for scheduling is called The Borg and they occupy a bunch of borglets #QConLondon http://t.co/G3q2jbqY34

    @adrianmouat: The understanding things scrutinize relish they work from the outside is because they assume they don't work on the inside John Wilkes (google) #qconlondon

    @mylenereiners: John Wilkes (#Google ): of course they execute not work. Things crash sum the time. (...) that's OK. #qconlondon

    @rvedotrc: For a service running on 2,000 machines (say, Google Calendar), 10 machine failures per day is normal, and fine – John Wilkes #qconlondon

    @rvedotrc: Servers are cattle; you don’t custody if you lose one. Your laptop is a pet.– John Wilkes, Google #qconlondon

    @rvedotrc: “When Michael Jackson died, they thought it was a denial of service attack.”John Wilkes, Google #qconlondon

    @floydmarinescu: Google mixes production apps (gmail) and batch jobs on the selfsame machines for cost efficiency #qconlondon http://t.co/gzm6VPsjh2

    @scottwambler: execute you understand sum of the trade offs associated with a given strategy? Or just focused on how it affects you? #qconlondon

    @rvedotrc: existent data is noisy. Live with it.”– John Wilkes, Google #qconlondon

    @rvedotrc: Experiments [on live] are OK, provided you occupy a superb course of stopping them in a speed and rolling back”– John Wilkes, Google #qconlondon

    @andyp1per: Exposing mechanisms [to users] is delicate - John Wilkes #qconlondon

    @pzfreo: #qconlondon nice distinction between slo (objectives

    @bruntonspall: If you are not monitoring it, it *is* out of control #qconlondon

    @hnzekto: John Wilkes: "70% of their resources are spent in application monitoring." @Google Cluster Management #qconlondon

    @rvedotrc: Everything at Google runs in a container – including their VMs.”John Wilkes #qconlondon

    @pzfreo: Not tidings but confirmed. Google starts 2 billion containers a week #qconlondon

    @ludovicianul: internally they don't exercise Docker, externally it turns out to exist a superb thing - John Wilkens, Google. #qconlondon

    @csanchez: John Wilkes: "you shouldn't exercise Kubernetes in production until v1, which should exist released in 1-2 months" #qconlondon

    Netflix Built Its Own Monitoring System - and Why You Probably Shouldn't

    by Roy Rapoport

    Pere Villega attended this session:

    His talk revolved around the NIH issue that affects many companies. If you occupy a problem,you should respect some questions first:

  • are you the first person to occupy this issue?
  • are you the first to custody about it given your constraints: relevance to business, your scale, etc
  • are you certain about the above answers?
  • In some cases you may really exist the first and you may requisite to build your own solution. But most of the time that is not lawful as solutions, either paid or free, exist.

    In the end, NIH is about trust: they don't confidence other people's code, their product, their organisation, or that they will retract superb custody of us as a customer. Even past performance of a 3rd party in other domains may stir the poise towards edifice their own solution.

    If the decision is to build your own product, that's ok.

    Will Hamill attended this keynote:

    Roy started with describing Netflix’s culture, which is too aptly minute in CEO Reed Hasting’s now illustrious ‘Culture Deck’ which you should definitely read. Netflix optimises their organisation to expand the speed of innovation by fostering a culture of liberty and responsibility. Netflix occupy an inherent anti-process jaundice that tends to weed out suboptimal procedures; if it doesn’t work it will exist corrected or abandoned.

    Roy discussed ‘Not Invented Here’, recommending that when you occupy a problem to decipher in your organisation, you should examine if you are the first to occupy it. Most times you are not the first to occupy that issue which means there is superb news: there are already things out there to wait on that you can use….

    NIH often boils down to ‘not invented by us, an organisation that they can trust’. A few reasons why they wouldn’t confidence them are that they don’t confidence the technical credentials; they occupy been warned away from them by people they execute trust; they don’t confidence that the other organisation has their best interests in intellect (for example, they’re selling us something).

    Occasionally, NIH is caused by CV-driven development. Roy argues that this is not always bad, as there is value in learning, there is value in improving the reputation of the company by creating a new product especially if you open-source the result, and value in keeping the developers jubilant in working on something challenging. …

    Roy discussed one course for mitigating this when using OSS; forking the project and merging contributions back into it. Roy too talked about composability of the components within your solution: respect whether you may want to supersede any of these with other people’s work in order to enhance the system. This would require a superb separation of responsibilities across parts of the system to retract handicap of such a plug-and-play approach….

    Wrapping up, Roy said that when addressing NIH issues, dig in and find out which reasons are actually essential to you. Find out if it’s really a technical decision, and if there is any course you can mitigate the consequence while soundless meeting the needs.

    Twitter feedback on this keynote included:

    @csanchez: Netflix "we hire really smart engineers and remain the heck out of their way" @royrapoport #qconlondon http://t.co/sAEgdPH0mm

    @trisha_gee: Process should exist descriptive not prescriptive - it should picture what you already do, not command you how to execute it @royrapoport #qconlondon

    @rvedotrc: “You added the config [by convention]. then magic would happen. Not necessarily the magic you wanted though.” @royrapoport #qconlondon

    @danielbryantuk: Magic would happen, although often not the magic you wanted @royrapoport on home-grown software solutions at #qconlondon

    @scottejames: Eventual consistency as a paradigm can ( should ) exist applied to architecture decisions. #qconlondon

    @danielbryantuk: No one is going to build a monolith without creating it from a progression of components, right? @royrapoport at #qconlondon

    @csanchez: Netflix: sustain unexcited and build it yourself @royropoport #qconlondon http://t.co/4Kjg4aJSWO

    @danielbryantuk: Allowing developers to build stuff they want can exist superb for morale and hiring. Just exist limpid when doing it @royrapoport #qconlondon

    @trisha_gee: Making developers jubilant is a superb Thing. You might want to let them innovate @royrapoport at #qconlondon

    @csanchez: Netflix monitoring processes 1.2 billion data points per minute @royrapoport #qconlondon

    Software evolution Tales from the Continent

    by Enyo Kumahor

    Will Hamill attended this keynote:

    Enyo took to the stage for the closing keynote to give us an insight into some of the different challenges and opportunities that are encountered in Africa in software development. This was a really arresting session, giving a completely different view to how to enhance people’s lives with technology than the measure software company style of talks that filled the ease of the conference.

    Enyo described with graphs and maps how Africa is considered a mobile-first and mobile-only continent. Mobile penetration is lofty with the mediocre person having more than one phone [though it is likely a featurephone] in contrast to a very low uptake of wired broadband internet access, which is typically only prevalent in coastal areas where internet fiber connections relate the continent.

    Voice content and SMS based services are more popular, forming the majority of traffic on mobile networks, with data exercise very low. Interestingly, Enyo answered a question from the audience about low smartphone uptake and didn’t give the “smartphones cost a lot up front” respond I judge most people (myself included) were expecting. Smartphones cost more initially but cost a lot to operate, as they must exist charged every night. Not every person has on-demand access to dependable power, so charging would require going to somewhere a diesel generator is being operated. The cost of fuel has gone up considerably in recent years so this is prohibitively expensive….

    Enyo stated that it was most essential to exercise design thinking to procure the captious context for how the software was actually to exist used in order to decipher the existent problem. One of the side effects of being a developing continent means that few constraints to new systems already exist in this respect - Enyo elicited an “oooh” from the attendees as she deployed the line “we don’t occupy legacy code on the continent”!

    Twitter feedback on this keynote included:

    @peter_pilgrim: Crikey! A massive opening in #Africa where it is not uncommon to own 2 mobiles for each network #QConLondon http://t.co/FDio5Wc3Mg

    @annashipman: Left pic is the *two* Internet cables servicing the entire of Africa in 2009. Fascinating talk by @enyok #qconlondon http://t.co/A37dWB7L0f

    @shanehastie: #qconlondon @enyok handicap of edifice software in Africa - no legacy code, sum solutions are new

    @shanehastie: #qconlondon @enyok Africa has manpower - technology shouldn't supersede jobs it should support them.

    @shanehastie: #qconlondon @enyok Software needs to enable a zero cost service, no barrier to entry.

    @danielbryantuk: Understanding local context is key when developing software. Superb evening keynote about software dev in Africa by @enyok at #qconlondon

    To the Moon

    by Russ Olsen

    Quinten Krijger attended this keynote:

    The kick-off key note “To the Moon” was given by Russ Olsen. In a very entertaining and energetic course he reviewed the Apollo project. He started at the 1959, when the Western world was plagued by protests and awe because of the cold War. At this time, Russia was ahead in the space race and had produced the first picture of the far side of the Moon. The reaction of president Kennedy was to declare the goal of landing on the Moon before 1970. Russ Olsen took a chronological approach though the Apollo project, reflecting often on how difficult this actually was.

    Some nice things I will remember from this story.

    - The software driving the Eagle that landed was developed by a woman named Margaret Hamilton. Designing the first program that needed to execute multiple things at once and should exist able to react to unexpected situations, Olsen states that she invented the term “Software Engineering” to picture the realm of programming at an unprecedented flush of complexity, where human lives were on line.

    - Although the space race was itself a piece of the cold War, the side consequence of it was a hopeful subject. When the landing actually took place, the sense of exhilaration was enormous.

    - Very small faults can occupy life-threatening implication. As an example: the air lock not being completely vented when the pod was released from the ship that was at that time already orbiting the moon led to about a 0.1% dissimilarity in speed. The result was that Armstrong and Aldrin had to literally retract last-minute measures to avoid landing on a very unfriendly piece of Moon. A superb lesson for programmers!….

    Aim for the moon. It’s in the nature of an engineer to execute so.

    Tracks and Talks

    An Architect’s World View

    by Colin Garlick

    Will Hamill attended this session:

    Colin began his talk by outlining the structure of the architectural world view he wanted to describe: values leading to principles which are implemented by practices. The analogy given was how the agile manifesto states core values, and is backed by more specific principles and then implemented with particular practices. So without getting as prescriptive as practices, Colin told us about the values that he thought a conscientious architect should occupy and the principles they inform.

    The values of an architect as Colin describes them are as follows: the customers of the architect are both the business and IT; an architect is interested in the titanic picture (conceptual integrity, as Fred Brooks puts it); leadership and humility - specifically being an enabler of the system rather than the boss; teamwork and an understanding of the types of people involved in the team and their needs (Myers-Briggs given here as an illustration of differences between different archetypes of persons); and finally the integrity and consistency to warrant the confidence invested in the architect to deliver….

    Simplicity is an essential principle, ensuring that the models created, documents generated etc are done for a specific audience and purpose rather than for their own sakes. Injecting patterns into solutions adds complexity rather than simplicity - less is more. …

    The next principle Colin talked about was just-in-time design. Delayed decisions are made with more erudition about the situation. Deferring decisions to the terminal responsible second allows us to investigate and try and storm the assumptions they would make. …

    ‘Deliver working solutions’ was Colin’s next principle. …

    An architect should too sustain learning; using retrospectives, lessons scholarly sessions and the likes to find out how the architecture or design you proposed actually fared in the existent world. Find out what happened when the decisions you made and plans you set were actually carried out by teams, and how the implementation panned out in reality….

    Quality should exist a main consideration of the work of an architect - planning for testing and verification of the assumptions is important. An architecture that does not respect testability is usually not a superb architecture. Know when ‘good enough’ occurs for your work, and try to attain this balancing point in ensuring you occupy built in enough quality and not over-egged the pudding.

    Managing change and complexity was Colin’s final principle. … anticipate that your architecture will requisite to change as they find out more about the problem domain. Don’t try and preclude change or preempt future needs, but create systems where changing your approach or throwing away parts of the architecture can exist done if needed.

    Twitter feedback on this session included:

    @lamb0: Architecture should exist simple and grounded in values that people can buy into #qconlondon @ColinGarlick

    @piotrbetkier: Any bright fool can compose things more complex, it takes a genius to execute the opposite. At #qconlondon on talk about designing architecture

    @marekasf: Antipattern: Ivory Tower Architecture @ColinGarlick #qconlondon

    Evolutionary Architecture and Micro-services - a Match Enabled by Continuous Delivery

    by Rebecca Parsons

    Will Hamill attended this session:

    Microservices … tend to exist smaller than SOA services …, smaller, and focused around solitary business capabilities instead of technologies. Microservices requisite to exist independently deployable as they change at different rates, require itsy-bitsy centralised management, and sequester tech choices internally from the other services that depend upon it. Microservices are often described as having smart endpoints but mute pipes. Another very common factor is the want of (what I call) the BandwagonDB - the solitary monster database that sum The Data lives in; microservices are often responsible for their own data and sharing access or reporting is done via APIs.

    More granular services become smaller and chattier but larger services are more inflexible and can suffer from complexity and coupling, so getting the size preempt is tricky. The implications of pursuing a microservice based approach are heavily weighted towards the operations side: independently scalable implies worthy investment into deployment automation and continuous delivery; monitoring for services is crucial; it is impossible to affect that service failures will not happen; eventual consistency in data needs properly addressed. …

    Decomposing the monolith: respect DDD bounded contexts to wait on split responsibilities and business capabilities. judge about what the consumers for the service requisite - and if there is no consumer, then perhaps there is no requisite for that service? Consumer driven contracts for services can too shape client tests for the interfaces. …

    Evolutionary architecture is derived from evolvability of the system as a first class concern during its design. Tolerate and anticipate change rather than attempting to call the future and lock in requirements that don’t exist yet. Being awake of Conway’s Law, they can try and design their teams to reflect how they intend the architecture - in particular arranging teams around the services to create for business capabilities.

    Microservices is clearly a spicy topic right now, but requires discipline, insight into the problem domain and above sum is no silver bullet.

    Quinten Krijger attended this session:

    A nice concept here was the “Reverse Conway’s Law”. While intuitive and on some occasions actual piece of their strategy consultancy, this was the first I heard it defined as such. Conway’s Law in short states that organisation structures will exist reflected in the architecture of the software that the organisation develops. For example, a company without a DevOps culture (meaning that operations is a separate team) that tries to implement a microservice architecture, will probably conclude up with many components that are strongly coupled on an operational flush that can’t exist deployed separately. The “Reverse Conway’s Law” then, is to create software in the course you would relish the organisation to be. You will requisite to exist conscious of the many pitfalls of Conway’s Law itself, but when done correctly this can exist a superb course to induce organisational changes.

    Implementing Continuous Delivery: Adjusting Your Architecture

    by Rachel Laycock

    Will Hamill attended this session:

    Rachel began by describing the scenario when she was brought into a client site and given a require by a customer exec “We want Continuous Delivery”. From working with the client and understanding their environment Rachel’s response was “you can’t occupy CD” - not a satisfying respond for an exec who wants to procure to value. When working with the client and their intricate codebase, Rachel came across a lot of the aspects of “you must exist this tall to ride” barriers to entry of a microservices architecture and implementing CD. Three of the main things she scholarly were the implications of Conway’s Law, the significance of keeping things simple, and evolving the architecture….

    The ‘big ball of mud’ architecture often results because expediency in releasing the system is focused over a cleanly and evolvable design. More code is added as more features are rushed out the door, increasing technical debt as no slack exists to preserve or help quality as they travel along. titanic coupling problems betide in the codebase and the components in the design are pulled tighter together as this happens, which leads to inflexibility in operation. …

    Rachel describes the throe of software architecture as dealing with the tension between striving for low coupling and lofty cohesion. Attempting to mitigate this on the titanic ball of mud systems means identifying the seams and interfaces between areas of different behaviour and writing tests around those boundaries to allow us to safely separate the components from each other. Rachel too described the Strangler Pattern to inaugurate replacing parts of the older system and redirecting functionality to newer, cleaner components.

    Rachel then went on to dispute the aspects of a microservice architecture that can mitigate against these issues. … Things to watch out for when pitiful to microservices include distributed transactions and an understanding of the domain (as services should split along domain boundaries and not technical ones). Rachel says that they don’t requisite to microservice-ify everything; that maturity and competence in continuous delivery is an essential pre-requisite, and that automation and nearby collaboration with operations are very essential to wait on manage the overheads of going from solitary monolith deployments to deploying, operating and maintaining many services.

    Rachel finished off her talk with calling for an appreciation of evolvability in system architectures. You don’t requisite to design for Google scale now, but you should design for the aptitude to exist changed. Architecture of the system is the things about it that are hard to change. The parts these are usually correspond to -ilities and bigger decisions made that can’t exist unmade cheaply or quickly; to identify where these decisions are you requisite to exist talking to the customer about their scale, security, business needs, and future direction. Creating an architecture where components can evolve separately, with less constraint to change, is more essential than trying to call an unknown future. Areas which requisite to change most often are likely to mask the most complexity. Putting more accent on the testability of these areas and treating the testability as a top flush requirement of the architecture will result in a higher quality system.

    Twitter feedback on this session included:

    @paulacwalter: Flexibility of organisation is key for efficient design. Otherwise it's very hard to compose changes where needed @rachellaycock #qconlondon

    @AndrewGorton: Software architecture represents the tension between coupling and cohesion @rachellaycock #qconlondon

    @randyshoup: Yesterday's best exercise is tomorrow's anti-pattern @rachellaycock #qconlondon

    @randyshoup: Hope is not a design pattern @mtnygard via @rachellaycock #qconlondon

    Small Is Beautiful

    by Kevlin Henney

    Yan Cui attended this session:

    Kevlin has plenty of well-applied, mem­o­rable quotes, start­ing with this one:

    Sus­tain­able devel­op­ment is devel­op­ment that meets the needs of the present with­out com­pro­mis­ing the abil­ity of future gen­er­a­tions to meet their own needs. - the report of the Brundt­land Commission

    when applied to soft­ware devel­op­ment, my inter­pre­ta­tion of it is : “don’t retract on more tech­ni­cal debt than you can rea­son­ably pay back in the future in favour of short-term gains”….

    On the other extreme of the spec­trum, you occupy peo­ple who are so con­cerned about future needs they conclude up com­pletely over-engineering their solu­tion to cope with this uncer­tainty and conclude up with projects that are delayed or worse, never delivered.

    You should judge of soft­ware as prod­ucts, not projects. If soft­ware are projects then they should occupy well-defined conclude state, but most often, soft­ware execute not occupy well-defined conclude state, but rather evolved con­tin­u­ously for as long as it remains desir­able and purposeful….

    Cre­ativ­ity needs a bound­ary. With­out any bound­aries, a painter might exist lost if you just examine him to “draw a pic­ture”, and would you cre­ate any­thing more than a “hello, world!” appli­ca­tion if asked to just “write a program”? …

    Kevlin too pointed out another superb point – the more time you disburse work­ing on a project, the more the endow­ment consequence kicks in and they become less inclined to change. …

    Twitter feedback on this session included:

    @JanSabbe: Best course to deal with legacy code? Beer. #qconlondon

    @adrianmouat: 'This legacy system is really small and comprehensible' - things people don't yell @KevlinHenney at #qconlondon

    @alblue: “It hit the deadline — at some considerable speed judging by the fallout” — @KevlinHenney at #QConLondon

    @camassey: Software is executable fiction -@KevlinHenney #qconlondon http://t.co/pK9mLdPqca

    @camassey: Coding styles, if practiced by enough people, *are your architecture*. @KevlinHenney #qconlondon

    @camassey: For any activity, there is an preempt scale. @KevlinHenney #qconlondon

    @camassey: If you are striving for beauty or elegance, *constraints are necessary*. You requisite a boundary. @KevlinHenney #qconlondon

    @jgrodziski: Softwares execute NOT occupy economies of scale @KevlinHenney #qconlondon small software is cheaper http://t.co/BxxAv0VuGD

    @daverog: Unlike milk, software gets more expensive, per unit, in larger quantities (diseconomies of scale) @KevlinHenney #qconlondon

    @camassey: Trees nicely picture a neatly decomposed structure. Except that the existent world is intricate @KevlinHenney #qconlondon http://t.co/78vg0eefM9

    @camassey: They design & staff-up teams at the start of the project. When they are the *most* unlettered about its requirements. @KevlinHenney #qconlondon

    Treat Your Code as a Crime Scene

    by Adam Tornhill

    Ben Basson attended this session:

    Adam quickly introduced the concept of Geographical Profiling - a criminal investigative course used to wait on narrow down the likely zone where a serial offender may live or work, based on the location where the related crimes were committed. I very much savor the concept that bugs are essentially "code crimes" and that they may exist able to leverage data in such a course as to zero-in on troublesome areas in this way.

    Of course, to execute this they can't just scrutinize at the code in its current state, they must draw upon revision history and statistics from version control, and then analyse and present this data in a useful manner. Adam introduced a number of potential visualisations, including the intriguing Code City, where lines of code are represented in the height of the generated buildings.

    Adam goes on to intimate that the code quality of an individual source file is inversely related to the number of programmers that occupy worked on a source file (the theory being that more people procure involved in troublesome areas as they occupy to exist touched more often), and that while there are lots of measures of complexity, the number of lines is in most cases a pretty superb indicator.

    The final suggestion from Adam was that in addition to analysing code in this way, it would exist arresting to experiment with more proactive warnings or monitoring - letting developers know when they're about to work on particularly intricate or commonly edited code (i.e. here exist dragons). He too suggested that version control tools could implement Amazon-style recommendations; "other developers that worked on file A too worked on file B", which sounds relish a worthy idea.

    Yan Cui attended this session:

    Many stud­ies occupy showed that they disburse most of their time mak­ing changes or fix­ing bugs, which always start with under­stand­ing what the code does. They should there­fore they opti­mize for that.

    A com­mon prob­lem they countenance in today’s world is that soft­ware is pro­duced by many devel­op­ers across many teams, and no one has a holis­tic view of how the entire looks.

    When it comes to mea­sur­ing com­plex­ity, both lines-of-code and  cyclo­matic com­plex­ity are use­ful met­rics to con­sider even though nei­ther pro­vide a replete pic­ture of what we’re up against. They are use­ful because they suitable nicely with their main con­straint as devel­op­ers — their work­ing memory.

    Adam shows us how tech­niques from foren­sic psy­chol­ogy can exist applied in soft­ware, specif­i­cally the prac­tice of geo­graph­i­cal offender pro­fil­ing. …

    Using tools such as CodeCity you can lay down the geog­ra­phy for your code which reflect their complexity…. Adam too showed how you can track com­plex­ity of spicy spots over time and exercise them to project into the future with Com­plex­ity Trend analysis….

    Tem­po­ral Cou­pling – by analysing your com­mit his­tory, you can find source files that are changed together in com­mits to iden­tify depen­den­cies (phys­i­cal cou­pling), as well as ‘copy-and-paste’ code (log­i­cal coupling)….

    By show­ing the num­ber of com­mits each devel­oper makes on a source file you can iden­tify the knowl­edge own­ers of that piece of your codebase. …In the per­fect world, sum knowl­edge own­ers for a com­po­nent (source files for one project, for instance) would exist con­cen­trated within a team, which shows that the respon­si­bil­ity of that com­po­nent is well defined and aligns with the orga­ni­za­tional structure.

    Twitter feedback on this session included:

    @ignazw: Code as a crime scene. Pretty cool! There's a lot of crime info in your software control system. #qconlondon http://t.co/EQQVEQ7OOt

    @willhamill: But the change took ages because DBAs are where Change Requests travel to die - @AdamTornhill at #qconlondon

    @danielbryantuk: Adding extra software evolution teams to a project increases communication channels @AdamTornhill at #qconlondon http://t.co/fEnD918NHq

    Building a Modern Microservices Architecture at Gilt: the Essentials

    by Yoni Goldberg

    Will Hamill attended this session:

    Yoni described how Gilt made three main architectural changes to their application: pitiful the application platform to the JVM (primarily Scala) for perceived platform maturity, the stability & concurrency benefits and the garbage collection; refactored the solitary Postgres database into dedicated data stores for different parts of the application; and began splitting the monolith up by behaviours, which Yoni called entering “the era of macro and micro services”.

    Initially splitting the application into a small number of services met the majority of the scaling needs but most of the developer throe was not solved: the new services became almost monolithic due to size and internal complexity and soundless the codebases had itsy-bitsy ‘ownership’ and integration and deploys were painful.

    The team at Gilt then doubled-down on the microservices approach, reducing the scope of individual services and empowering the teams as the owners of the service responsible for the deployment and focusing on continuous delivery as a means of streamlining the releases. APIs used for the microservices to communicate with each other were defined by an ‘API design committee’ in each team and documentation generated using Swagger. The front conclude was decomposed into a larger number of Play and Scala applications responsible for different sections of the website. For example, the search pages, product pages, checkout and so on are sum served by different apps….

    Data ownership was devolved to the teams operating the services, and each team chose the best solution for storing their data. Managing databases, a schema evolution manager independent from the service code was responsible for DB changes, deploying updates as tar files to exist applied to the database. Fix-forward was the approach taken to DB migration, with no rollbacks.

    Yoni too described the concept of ‘mid tier microservices’ which exist to aggregate multiple calls to many fine grained services (for illustration a ‘customer’ mid-tier service aggregating calls across half a dozen or more specific ‘customer account’ or ‘customer profile’ ilk services) to cache, decorate and collect results needed by other depending services.

    Pere Villega attended this session:

    Yoni Goldberg, Lead Software Engineer at Gilt, explained the Gilt moved from a Ruby monolith to a Microservices approach. The understanding was that Gilt operates a model of flash sales with massive spikes, and adding certain vendor caused cascading errors across the site. To fix the issues they moved to JVM, started what he calls a macro/micro services era and used dedicated data stores.

    During the process they realised the new services where semi-monoliths, not fixing sum of the issues, so they kept working until they reduced the scope of the services (both for back-end and front-end, they occupy multiple webapps for UI), which in spin facilitated deployment and rollbacks.

    Currently they occupy 300 services in production, and their data demonstrate a very arresting pattern: once they had in Place sum the right tools such a team could travel from creation to deployment of a new service (a basic placeholder) in around 10 minutes, the productivity and the number of services increased a lot….

    Something that has facilitated the adoption of Microservices has been a well defined API. Yoni argues that a well defined API solves issues relish discoverability, documentation and internal adoption. Tools relish Swagger facilitate this.

    An issue associated to having so many Microservices that is not mentioned often is that the network ends up acting as a bottleneck, due to the amount of calls generated. Their solution is to create mid-tier Microservices, which are a ribald API that hides multiple small services from the request. Your application just calls an endpoint and that, in turn, does several calls. This reduces the load, even more if you exercise caching….

    Gilt too uses micro-databases, that is, every Microservice has its own database, they are not shared across services. This means the service owns everything: API, data, behaviour. No conflicts between services due to shared databases.

    Finally, they don't counsel teams of less than 30 people to travel into Microservices due to the manpower needed.

    Rebuilding Atlas -- Advertising at Scale at Facebook

    by Jason McHugh

    Twitter feedback on this session included:

    @charleshumble: Time spent on mobile in the US surpassed time spent watching TV. Just mobile. #qconlondon

    @charleshumble: Facebook Atlas uses Presto extensively. Useful when you requisite a relational model and can't easily Shard #qconlondon https://t.co/imrxOi9MPn

    @ignazw: So Facebook aquired Atlas for 100 M$ ... http://t.co/NO9ZCqguoV via @forbes #qconlondon

    Scaling Uber's Real-time Market Platform

    by Matt Ranney

    Leo Simons attended this session:

    My favorite talk of the day is from Matt Ranney, who talks about uber's existent time challenges. It's a pretty quirky talk about a pretty quirky architecture. The shape of uber's problem is a bit different from a lot of other titanic architectures, and so Uber are doing various arresting things really differently. For example, they scholarly that when failing over a data center, uber stores the energetic trip data on the driver's phone, and when that phone gets routed to the new data center, it's tasked to re-upload that data to the new data center. This means they procure to avoid expensive cross-data headquarters replication for the spicy data. They too learn that Uber is being a superb open source national and open sourcing various arresting bits; I'm definitely going to exist studying some of that!

    Yan Cui attended this session:

    Uber’s ser­vices are writ­ten in a mix­ture of Node.js, Python, Java and Go, whilst a entire blend of data­bases are used – Post­greSQL, Redis, MySQL and Riak….

    In order to scale their ser­vices, Uber went with an approach of build­ing state­ful ser­vices using Node.js. In addi­tion, they too intro­duced a cus­tom RPC pro­to­col called ring­pop, which is based on the SWIM paper. Ring­pop too runs on its own TChan­nel mul­ti­plex­ing and fram­ing protocol….

    For Uber, avail­abil­ity is of para­mount impor­tance, as the cost of switch­ing to com­peti­tor is low.

    Twitter feedback on this session included:

    @randyshoup: Never underestimate the power of developer enthusiasm @mranney @Uber #qconlondon

    @csanchez: Uber's dispatch system is written in NodeJS. DBs used: Redis, Postgres, MySQL, Riak,… @mranney #qconlondon

    @glynn_bird: Uber talk their AP data layer: "we always favour availability because the user will switch to a competitor if we're down" #qconlondon

    @markgibaud: In NodeJS, tchannel [Uber's custom RPC protocol] is 20x faster than HTTP - @mranney at #qconlondon

    @csanchez: Uber availability: everything retriable, killable, crash only (no graceful stops) even databases @mranney #qconlondon http://t.co/1ro9il6tLs

    @vwggolf3: #qconlondon Uber fails over data centers by using condition & data stored in colleague phones

    @FZammit: Uber using mobile app as a failover mechanism #developers #qconlondon

    @randyshoup: @Uber fails over between data centers by having driver apps regularly replay their state. Clever! @mranney #qconlondon

    @colmg: Everything is retryable, everything is killable at Uber - @mranney #qconlondon @aolireland

    Service Architectures at Scale: Lessons from Google and eBay

    by Randy Shoup

    Yan Cui attended this session:

    At Google, there has never been a top-down design approach to build­ing sys­tems, but rather an evo­lu­tion­ary process using nat­ural selec­tion – ser­vices sur­vive  by jus­ti­fy­ing their exis­tence through usage or they are dep­re­cated….

    Ser­vices are built from bottom-up but you can soundless conclude up with clean, limpid sep­a­ra­tion of concerns.

    At Google, there are no “archi­tect” roles, nor is there a cen­tral approval process for tech­nol­ogy deci­sions. Most tech­nol­ogy deci­sions are made within the team, so they’re empow­ered to compose the deci­sions that are best for them and their service. …

    Even with­out the pres­ence of a cen­tral­ized con­trol body, Google proved that it’s soundless pos­si­ble to achieved stan­dard­iza­tion across the organization.

    Within Google, com­mu­ni­ca­tion meth­ods (e.g.. net­work pro­to­col, data for­mat, struc­tured course of express­ing inter­face, etc.) as well as com­mon infra­struc­ture (source con­trol, mon­i­tor­ing, alert­ing, etc.) are stan­dard­ized by encour­age­ment rather than enforcement. …

    Whilst the sur­face areas of ser­vices are stan­dard­ized, the inter­nals of the ser­vices are not, leav­ing devel­op­ers to choose:

  • pro­gram­ming lan­guage (C++, Go, Python or Java)
  • frame­works
  • per­sis­tence mechanisms…
  • If it proves to exist suc­cess­ful then it’s extracted out and gen­er­al­ized as a ser­vice of its own with a new team formed around it. Many pop­u­lar ser­vices today sum started life this course – Gmail, App Engine and BigTable to cognomen a few….

    As the owner of a ser­vice, your pri­mary focus should exist the needs of your clients, and to meet their needs at min­i­mum cost and effort. This includes lever­ag­ing com­mon tools, infra­struc­tures and exist­ing ser­vice as well as automat­ing as much as possible.

    The ser­vice owner should occupy end-to-end own­er­ship, and the mantra should exist “You build it, you rush it”.

    The teams should occupy auton­omy to choose the right tech­nol­ogy and exist held respon­si­ble for the results of those choices.

    Twitter feedback on this session included:

    @ignazw: great companies change their architecture regularly #ebay #twitter #amazon #qconlondon http://t.co/DZAjSMPCYY

    @AlibertiLuca: #qconlondon why is Google so relish a flash ?? Simple :) http://t.co/ZZIRW9fwTu

    @jabley: 'At Google, most technology decisions are made locally rather than globally. Better decisions made in the field.' – @randyshoup #qconlondon

    @charleshumble: No architect role at Google. No central approval for technology decisions. eBay did occupy architecture review board @randyshoup #qconlondon

    @grantjforrester: “Standards become standards by being better than the alternative” @randyshoup #qconlondon

    @jgrodziski: In a develope service ecosystem, they standardize the arc of the graph, not the nodes #qconlondon @randyshoup

    @charleshumble: Every service at Google is either deprecated or not ready yet. Google engineering proverb. @randyshoup #qconlondon

    @solsila: On establishing standards: compose it really effortless to execute the right thing and really hard to execute the wrong thing. @randyshoup #google #qconlondon

    @a_alissa: #qconlondon google does not enforce standards, each team can exercise any programing language and libs they want#empowering_teams

    @djmcglade: Microservice - the word is relatively new, the concept is relatively develope @randyshoup #qconlondon

    @charleshumble: Teams should exist no larger than can exist fed by two great pizzas. @randyshoup #qconlondon

    @jabley: superb exercise of economic incentives to align service teams at Google. saturate downstream teams to grow more considerate customers. #qconlondon

    @jgrodziski: Risk of code change is nonlinear in the size of the change @randyshoup #qconlondon

    @charleshumble: Every code submission is reviewed at Google. #qconlondon

    @charleshumble: You can occupy too much alerting but you can't occupy too much monitoring @randyshoup #qconlondon

    Evolving a Data System

    by Simon Metson

    Twitter feedback on this session included:

    @paulacwalter: choose a realistic problem, not "We requisite to fix sum of their IT in the next six months. Here's a L20 note. travel execute it." @drsm79 #qconlondon

    @paulacwalter: It's not rocket science. Identify a problem (this is the hardest part), build a solution, evaluate it and repeat. #qconlondon @drsm79

    @paulacwalter: Evolving Data services. The apropos problems are not technical. How are they going to talk to each other and participate data? @drsm79 #qconlondon

    Continuous Delivery: Tools, Collaboration, and Conway's Law

    by Matthew Skelton

    Twitter feedback on this session included:

    @dsommerville_nw: Conway's Law (and the Inverse Conway Maneuver) becoming a recurrent theme at #qconlondon

    @DevOpsGuys: Bring people with you, treasure current skills #qconlondon #devops

    @DevOpsGuys: Optimise globally across the teams that requisite to collaborate #qconlondon #devops

    @camassey: Silos exist across environments as well as roles. Don't optimise your pipeline for just one environment! @matthewpskelton #qconlondon

    @Idris_Ahmed251: More dev teams solves nothing. Adds coupling with people's work, causes merge problems! (Conway's Law) #qconlondon http://t.co/oBPJ70WcQV

    @camassey: Conway's law has HUGE implications for org architecture, if you want particular software architectures @matthewpskelton #qconlondon

    @marekasf: microservices are relish children: they're small, cute and the more the better "@DevOpsGuys #qconlondon @camassey http://t.co/IMRaoVaBeO ”

    @julianghionoiu: The organisation's topology should closely resemble the application's architecture. #qconlondon http://t.co/h8aVdjxn7k

    @neilisfragile: Hadn't considered that implement option not only to promote collaboration, but too to discourage certain interactions #qconlondon @matthewpskelton

    Delivering Gov.Uk: Devops for the Nation

    by Anna Shipman

    Ben Basson attended this session:

    The things about the talk that I organize arresting were:

    1. There is a well-maintained operations manual to wait on people support the live services, so if someone is on-call and doesn't know a particular zone that well, they can draw on a wealth of information - or write that information for the next person once the problem has been investigated and resolved. This is clearly a superb concept that sum companies should really occupy in place.

    2. Deployment to production is managed by the requirement to occupy custody of a stuffed toy badger in order to deploy. I don't know if it's an intentional spoof of the Government's policy on culling badgers, but I couldn't wait on but chuckle slightly at the irony. It seems a itsy-bitsy silly, but I can descry the merit, especially as…

    3. Developers can deploy from their own laptops - a stark contrast to the customary Government process of using dedicated, locked-down machines with direct VPN access to data centers.

    Twitter feedback on this session included:

    @matthewpskelton: .@annashipman "#DevOps is a *culture* where developers and operations people work together" #qconlondon http://t.co/70FxG0lOz0

    @rvedotrc: Allowing the developers to deploy using their own hardware, not locked-down gov hardware, was a titanic win says @annashipman #qconlondon

    @rvedotrc: Heartbleed announced at 10pm, patched by 2am, deployments done from home, just because devs cared - @annashipman #qconlondon

    @rvedotrc: “Are you certain the deployment process will work?”“Well, they occupy done over 1000 of them already”- epic from @annashipman #qconlondon

    @matthewpskelton: .@annashipman "Technology choices at @gdsteam are *not* top-down" < +1 chosen by team in collaboration #qconlondon

    @danielbryantuk: exercise what technology you like, as you're going to exist supporting it in production paraphrasing @annashipman on GDS DevOps at #qconlondon

    @matthewpskelton: .@annashipman "I could not bring @BadgerOfDeploy with me today because that would discontinue deployments!" #qconlondon http://t.co/pOfdf9bzd7

    @matthewpskelton: .@annashipman "The most essential implement they occupy is their Ops Manual" "It's a vital document" < +1 #qconlondon

    @peter_pilgrim: GOV.UK now puts their operational service manual online on GitHub. "Document everything for people who are new to it." #qconlondon #in

    @camassey: How to bring in #DevOps: Document sum The Things -@annashipman #qconlondon http://t.co/elPCYQeGCR

    @camassey: #DevOps has implications for everything - inc. hiring, leaving, and (obviously) team trust. @annashipman #qconlondon http://t.co/qJBRcRv43E

    @phuturespace: #qconlondon. worthy talk by @annashipman. worthy to descry a practical successful application of DevOps.

    @matthewpskelton: .@annashipman "I execute not descry architecture as Command & Control, but instead to wait on the teams and then procure out of their way" #qconlondon

    Devops and the requisite for Speed

    by Stephen Thair

    Twitter feedback on this session included:

    @lamb0: If you don't engage HR and Finance, then you will fail to adopt devops, it’s a mindset and organisational model #qconlondon @TheOpsMgr

    Making Continuous Delivery work for You: The Songkick Experience

    by Amy Phillips

    Twitter feedback on this session included:

    @rvedotrc: “If you procure 4 people to scrutinize at code for 2 hours before release, I guarantee you, you *will* find a bug” - @ItJustBroke #qconlondon

    @matthewpskelton: .@ItJustBroke "Adding more developers did not compose things faster" #qconlondon http://t.co/fSDHEGx2IC

    @matthewpskelton: Release processes requisite flexibility and risk assessment - @ItJustBroke #qconlondon http://t.co/AHgug7UZDs

    @rvedotrc: “Features add no value until your users are using them” – the controversy for relish a flash turnaround, by @ItJustBroke #qconlondon

    @matthewpskelton: .@ItJustBroke "We asked the business to wait on define the acceptance tests" +1 parallel pipeline stages #qconlondon http://t.co/XDzf4pN0Fn

    @rvedotrc: “Limiting their automated Selenium acceptance tests to around 5 minutes, gives us the flush of assurance they need” – @ItJustBroke #qconlondon

    @rvedotrc: Identify the biggest problem with your process. Fix it. Repeat.Using problems to drive positive change.– @ItJustBroke #qconlondon

    Docker Clustering - Batteries Included

    by Jessie Frazelle

    Will Hamill attended this session:

    Docker supports clustering of containers OOTB with Swarm which serves the measure Docker API and allows transparent scaling to multiple hosts. If Swarm isn’t your bag, LibContainer which is too written in travel can exist used, and LxC containers are now supported as well.

    Service discovery is too provided OOTB with Docker, though it can exist configured to exercise etcd, consul or zookeeper instead. For scheduling, bin packing is provided OOTB and there is too a autochthonous option, with Mesos currently on the way.

    Jessie then gave a demo of using Docker with Swarm to define clusters of containers and manage them on the CLI. Regular Docker commands for individual container management work with Swarm, and too Swarm adds a number of commands for provisioning clusters, joining containers to clusters and the relish with simplicity: docker pull swarm,docker rush --rm swarm create and docker rush -r swarm join….

    Wrapping up, Jessie outlined the future direction of Swarm; rescheduling policies, further backend drivers for OOTB management functionality, support for Mesos, cluster leader elections and more & faster integration with new Docker features.

    motwin attended this session:

    A new implement in the Docker ecosystem: Swarm, which is a cluster management system for Docker containers.

    This is a autochthonous clustering system for Docker with:

  • native discovery of containers (and optional feature based on either etcd, consul or Zookeeper)
  • schedulers (bin-packing and random which are autochthonous support and soon Mesos)
  • constraints management
  • affinity management
  • Docker, Data & Extensions

    by Luke Marsden

    motwin attended this session:

    Fig alias now Docker Compose enables composition at the host level. For instance, if you occupy an application deployable on a servlet container that needs a database, you may choose in a microservices approach to exercise one Docker container for your servlet container and one for your database. But you requisite to deploy and rush these containers in the right order (the database first and then the servlet container), links these two containers to each others, setup the endpoints / ports and so on…

    Flocker can exist seen as the companion of Fig. In addition of a Fig yaml configuration file, Flocker needs a second yaml file that describes the topology of your Docker containers cluster: you picture on which node each of your Docker container has to exist installed. The description of the Docker container being hold by the Fig file.

    A second issue addressed by Flocker is the migration of a Docker container from one node to another node. Let’s yell you occupy a database wrapped in a container. To persist the data stored in the database, you can exercise Docker volumes that enables to persist data outside the container in the filesystem of the host. What happens if, for one understanding or another, you wish to migrate the database from one node to another? Flocker does the job: it can migrate a such container from one node to another. …

    Another miss of Docker is a plugins / extension mechanism. right now, it’s hard to glue some tools based on Docker (for instance, Weave and Flocker).Powerstrip may circumvent this issue. It’s an open-source project which direct to rapidly prototype extensions to Docker and enables to glue them. …

    What I occupy scholarly is too that using Docker volumes leads a coupling between the Docker container and its host. Hence, you can occupy issues when it handles to migrate a such container to another host.

    Docker vs Paas: May the Best Container Win

    by Paula Kennedy & Colin Humphreys

    Will Hamill attended this session:

    This talk was about discussing the dissimilarity in needs which may lead you to choose Docker over PaaS - obviously a straight comparison of one versus the other would exist illogical, so the two tried to point out the areas where one approach is stronger than the other. PaaS can easily handle multiple application instances and can occupy autoscaling rules defined; Docker does exactly and only what you configure it to do. PaaS can feature shared services such as health checking of tenant applications, centralised log aggregation, etc; Docker does not quest to provide this and you would requisite to create it yourself.

    Docker is more about the basics - letting you rush your application in a lightweight containerised environment and pitiful or creating new instances of that container rather than value-adding features relish PaaS now tends to be. Docker focuses on customisability and control in ways that you cannot control on PaaS. Docker container provisioning is much faster than instantiating a new virtual machine on IaaS.

    Colin and Paula argued each other down to an agreement: PaaS is likely to exist better for relish a flash iteration of a basic application, and Docker is likely better for control and more specific needs such as database management. Colin recommended that PaaS exist considered more for apps following the12 Factor principles, and containers with storage volumes used for stateful micro-services….

    Overall I was convinced that the controversy comes down again to whether you want to give up control of low flush concerns in order to profit from paying for more hands-off deployments and scalability, and if you can live with the lock-in that PaaS tends to imply. It depends - on your particular environment constraints :).

    motwin attended this session:

    Colin and Paula accord that there is Place for both PAAS and containers:

  • if your micro-services require to suitable the 12 factors, then a stateless PAAS can exist your holy graal
  • if your micro-services didn’t require to suitable the 12 factors, then Docker containers with volumes management can execute the job
  • How to Train Your Docker Cloud

    by Andrew Kennedy

    motwin attended this session:

    Clocker is a Docker containers cloud manager that can deploy applications described in the Brooklyn blueprint format. It can deploy the application on containers of several nodes and across multi-hosts. Clocker seems to occupy lots of features:

  • autonomics: scaling policies that can exist driven by sensors, cluster resizing
  • health room: to ensure resources availability (cpu, memory, etc.)
  • container management: with Docker images catalog, support of Docker files, creation of images automatically
  • placement and provisioning: on demand, with several viable placements strategies (random, CPU, memory, geography, and so on)
  • network management: with network creation, IP pool control, Docker ports forwarding for debug purposes, pluggable network providers (Weave,Kubernetes, libswarm), network virtualization
  • Securing "Platform as a Service" with Docker and Weave

    by David Pollak

    Will Hamill attended this session:

    David Pollack, the creator of Lift, began his talk about securing PaaS stating he believes that security skills require a different mentality to most developers, and understanding of more granular responsibilities. David said that he wanted to try and hire more replaceable people rather than creating esoteric tech experts (for obvious business reasons) so he preferred more widely understood and adopted technologies for securing his platforms - Docker and IP tables being better collectively understood than JVM Security Manager, in David’s example. David too praised Docker’s ease of use, providing a declarative format for configuration instead of relying upon Perl scripts and raw LxC containers….

    One of the problems David had was considering not only layers (a typical approach to both physical and application security) but too isolating the tenants of the PaaS from each other. Tenants’ applications needed to rush inside containers on virtual LANs that can talk to each other and shared backend resources but not other tenants. Shared services at the backend may exist topic to potential attack, so splitting into read only or write only services can confine surface zone and impact.

    David addresses these issues in his platform with each tenant application deployed into a Docker container, using Weave to define the tenant-specific subnet and IP tables to secure the access to the ease of the network. Shared data services in an RDBMS exercise table or column flush access controls managed by the RDBMS, and I/O heavy services with well understood security models can too exist shared. Credentials for services are isolated to each tenant and not globally visible.

    David said that he was jubilant with Docker’s security as LxC containers are a reasonably well understood technology and the new popularity it meant that there are many eyes looking at it both to exploit and help it. Finishing his talk, David said that he thinks the stir from VMs to containers is as titanic a shift in approach and utility as the shift from physical machines to VMs; that IP tables soundless work just fine for network flush application isolation; and that a layered approach to isolating risks is soundless the best approach.

    motwin attended this session:

    David Pollak distinguishes 5 threat models:

  • app to shared services (e.g. credentials)
  • app to the world via the network
  • app to the host via the code that runs on the host
  • app to the host via the network
  • app to app via the network
  • To preclude from these vulnerabilities, Docker provides a quite reasonable isolation from the host, while Weave subnets can sequester tenants (i.e. different apps). As far as iptables, they can secure the ease of network.

    At terminal some takeaways from David Pollak:

  • –icc=false in DOCKER_OPTS which means no intercontainer communication except via Weave
  • use iptables to control / restrict the bridge traffic to well known ports and public hosts
  • partition tenants onto separate Weave subnets
  • Cake Driven Development: Engineering at moo.com

    Will Hamill attended this session:

    Mike described how a few years ago Moo was facing troubles internally with meeting the needs of the business to release new products to market quickly … the teams were dissolved and reformed into cross functional groups responsible for specific business areas/products. The new teams, called crews, had responsibility for making a new cocktail and hosting an event to welcome each other into the new shape of the business … Crews were given specific business-aligned goals for their areas of work, were allowed to create their own workflows and were not forced into homogenising with the ease of the company. Autonomy in how the crews accomplish their goals is a powerful factor of motivation.

    Mike then revealed that most crews had stopped doing formal estimation of work items - instead of producing estimates for each particular and planning an iteration, the crews moved to a flux based system, doing planning as needed and working to help the product backlog. The business don’t custody that you are not doing minute estimates for each piece of work when you can prove that you are releasing new working software on a regular and dependable basis. Product managers from the crews were mediated when they clashed by a crew lead representing the overall business goals.

    After the reorganisations, the smaller cross functional crews had better decision making as everyone needed to understand how they can release working software was embedded in the teams. The evolution manager role is being replaced with a platform manager, someone with vision across the teams and who can wait on poise doing things relish a flash with doing things right. Another role added was the ‘people engineer’, combining HR responsibilities with the tech team lead responsibilities.

    In day to day work terms, Mike described the culture in Moo as being focused on teams aligning their releases with a fortnightly release train. … ‘Bug squashing Tuesday’ is set aside for people to tackle defects and help intricate or low quality areas, and people in the crews typically exercise XP practices such as pair programming, regular retrospectives and collective ownership. … Wrapping up, Mike stated that overall they direct to create a culture which empowers people to exist proactive to decipher problems.

    Dream Job? The Vision and Journey to the Company Culture You Want

    by Pete affliction & Helen Walton

    Twitter feedback on this session included:

    @SalFreudenberg: @Helenislovely #qconlondon I've seen companies ignore ideas because the person is too junior, too external or just from another department..

    @portiatung: #qconlondon @Helenislovely @peteburden How systems shape their behaviours and the people they become http://t.co/xF5odzo8vi

    @portiatung: #qconlondon @peteburden @Helenislovely "Advocacy 6 times more than investigation in organisations"

    The Power of Hope: Getting You from Here to There

    by Portia Tung

    Twitter feedback on this session included:

    @shanehastie: #qconlondon @portiatung hope ISN'T - unrealistic optimism, scholarly optimism, ilk A mindset, a measure of intelligence or previous achievement

    @shanehastie: #qconlondon @portiatung Hope is "the sum of the willpower and waypower to achieve your goals"

    @Helenislovely: course power: mental capacity they call on to find more efficient ways of reaching goals. Hope with @portiatung #qconlondon

    @shanehastie: #qconlondon @portiatung useful goals requisite success criteria. Validate the clarity of the goal.

    @Helenislovely: Validate your goals. Write in pairs to clarify. #qconlondon

    @charleshumble: @portiatung existent options. Never confide early unless you know why. #qconlondon

    @johannescarlen: Aren't programmers the most hopeful people you know? - Portia Tung #qconlondon

    @SalFreudenberg: @portiatung #qconlondon help hope by letting travel of awe of failure. Whatever the outcome I will occupy learned.

    Back to the Future: What Ever Happened to Being Extreme?

    by Rachel Davies

    Ben Basson attended this session:

    Some of the things I organize really fascinating included:

  • Developers determine what to work on next - they execute research with the business and work out shared priorities, so that nobody spends time working on features that provide no business value.
  • Mobbing - basically the selfsame concept as paired programming but with more people involved, so a group sit around a great TV and keep and dispute while one person writes code - swapping around every 10 minutes.
  • Building 20% learning time into the working velocity - to sustain fresh ideas coming in and motivation high.
  • Using a developer-on-support rota essentially as a human distraction shield, so the other developers can procure on without interruption.
  • It turns out that developers at refractory only write code about 40% of the time, due to the 20% learning time and other responsibilities (research, monitoring, support, etc). As Rachel points out, this is fine.
  • Sebastian Bruckner attended this session:

    Great talk from Rachel remembering of the core principles of Extreme Programming which sometimes might foster too short in the today’s agile life. She too gave an arresting insight about how she and her teams were implementing it in the field. Among the known and well adapted aspects of XP she mentioned a course which was new to me.

    Mobbing (Mob Programming):

    Mobbing is similar to pair programming but with three to five persons instead. The code is on a titanic TV, one developer is actually programming the others are thinking and discussing. After a fixed time box (e.g. 20 minutes) another one grabs the keyboard, similar to pair programming. – They exercise mobbing to start difficult or intricate stories.

    Twitter feedback on this session included:

    @Helenislovely: Microsoft windows XP was the death of extreme programming. cognomen no longer cool. @rachelcdavies #qconlondon

    @shanehastie: #qconlondon @rachelcdavies one risk with a pure craftsmanship focus is losing the focus on edifice software for people

    @paulacwalter: Continuous everything, no separate integration and testing phases, execute sum activities sum of the time. @rachelcdavies #qconlondon

    @douglastalbot: #qconlondon No point in researching features if you are simply going to execute sum of them! Just procure edifice @rachelcdavies

    @shanehastie: #qconlondon @rachelcdavies When the people who build the product too support it "they don't build mute things that don't work"

    @Helenislovely: Being able to sustain learning keeps you fresh. Keeps you happy. This is a very @SparkConf exercise from @rachelcdavies #qconlondon

    @shanehastie: #qconlondon @rachelcdavies retrospectives: it's essential that teams procure together and examine how they are working and adapt

    @shanehastie: #qconlondon @rachelcdavies XP is about "if there is something that works, how can they execute more of it" spin the dial up. Experiment and learn

    @dsommerville_nw: truth around the world: developers are always downstairs - so consequence some "interruptable" devs upstairs [with the business] #qconlondon

    @paulacwalter: focus on quick continuous feedback but don't ignore feedback that takes longer to arrive, relish customer usage! @rachelcdavies #qconlondon

    @shanehastie: #qconlondon @rachelcdavies XP lets us: Deliver value sustainably and build change tolerant systems. too Mastery & Autonomy,

    @metmajer: If you pair with the selfsame person for a long time you really occupy to relish them. @rachelcdavies on #PairProgramming at #qconlondon

    @mattwynne: Team at @unrulyco only budget to disburse 40% of time developing stories — arresting stat from @racheldavies at #qconlondon

    @paulacwalter: Learning time for the team is just piece of the service, factored in relish holidays and meetings @rachelcdavies #qconlondon

    Learning to Become Agile, with Retrospectives

    by Ben Linders

    Twitter feedback on this session included:

    @shanehastie: #qconlondon @BenLinders Evaluate your retrospectives - compose certain the team is getting value from the time spent

    @shanehastie: #qconlondon @BenLinders in retrospectives the facilitator must exist focused on allowing the team to compose superb decisions for themselves

    @shanehastie: #qconlondon @BenLinders Coach role in retrospectives is to support team with the right questions and to support them in making changes

    @shanehastie: #qconlondon @BenLinders Yes! the product owner is piece of the team - they should exist in the retrospective!

    @shanehastie: #qconlondon @BenLinders Manager role in retrospectives is to support and empower the team to compose changes

    @shanehastie: #qconlondon @BenLinders some of the benefits that efficient retrospectives can enable in your teams http://t.co/lEAEuNmdjT

    @shanehastie: #qconlondon @BenLinders don't allow teams to overwhelm themselves with too many action items - confine the number of actions #retrospective

    Progress from "What?" and "So What?" to "Now What?"

    by Larry Maccherone

    Twitter feedback on this session included:

    @rvedotrc: Challenge people for rationale and to provide models used for decisions – @lmaccherone #qconlondon

    @_yowan_: Every decision that you compose is a forecast #qconlondon http://t.co/vzTDcXzYOB

    @Helenislovely: Monte Carlo forecasting to build probability distribution. Improvement on #noestimates? @LMaccherone #qconlondon

    @shanehastie: #qconlondon @LMaccherone exercise metrics correctly to change the nature of the forecasting conversation

    @Helenislovely: astounding how often people create slow metrics because they forget the outcome they wanted them for in the 1st Place #qconlondon

    @Helenislovely: How to choose rectify visualisation. Comparison, trend, forest AND trees @LMaccherone #qconlondon

    @Helenislovely: Only 2% of the data collected gets used. Don't help analytics, bake data exercise into product #qconlondon

    @Helenislovely: Pattern-based decision makers. Issue is that they procure the wrong pattern, often filtered by the cognitive jaundice @LMaccherone #qconlondon

    @Helenislovely: Changing habits: direct the rider, motivate the elephant and shape the path #qconlondon

    @Helenislovely: They compose emotional decisions but they judge it's rationally based on data. So true. @LMaccherone #qconlondon

    @Helenislovely: Imperfect data may exist better than no data. not certain imperfect models better. judge of tainted decisions driven by bell curves #qconlondon

    Taking Back Agile

    by Tim Ottinger & Ruud Wijnands

    Twitter feedback on this session included:

    @Helenislovely: I recognise sum these agile pains. But I judge they arise from control cultures and that is hard to fix. @tottinge @RuudWijnands #qconlondon

    @shanehastie: #qconlondon @tottinge @RuudWijnands No one else will compose change for you - you occupy to compose the change yourself

    @shanehastie: #qconlondon @tottinge @RuudWijnands Original intent Programming More Intensely , but that was PMI and was already taken so it became XP

    @Helenislovely: 'Death of hope' that resonates for me. Keeping hoping something will change can procure in the course of action. #qconlondon

    @shanehastie: #qconlondon @tottinge @RuudWijnands Becoming (acknowledge want of erudition and build it up) vs Seeming (cannot admit ignorance)

    @twicezer0: Don't stockpile pain: root of agile. @tottinge @RuudWijnands #qconlondon

    @shanehastie: #qconlondon @tottinge @RuudWijnands remember the birth of the #AgileManifesto - "we are uncovering" - constant ongoing learning

    @shanehastie: #qconlondon @tottinge @RuudWijnands The productive social context of getting things done, done, done! I want this agile back.

    @Helenislovely: 'Getting it done, not holding hands and talking about feelings'. XP group hug! @tottinge @RuudWijnands #qconlondon

    @Helenislovely: You don't requisite authorization but companies can create blocks. @tottinge @RuudWijnands #qconlondon

    @shanehastie: #qconlondon @tottinge @RuudWijnands as a leader give people enough confidence to grow into.

    @shanehastie: #qconlondon @tottinge @RuudWijnands procure rid of hope (someone else will fix it) and retract responsibility to fix it yourself

    @shanehastie: #qconlondon @tottinge @RuudWijnands Velocity is not a option - it is a consequence. Every bug is a decision making flaw.

    @shanehastie: #qconlondon @tottinge @RuudWijnands how relish a flash you travel today depends entirely on the quality of the code you work on.

    @Helenislovely: Bugs are defects in thinking. Nice description. And bugs in culture are what bother me. @tottinge #qconlondon

    @V_Formicola: How relish a flash you develop a epic depends on the condition in which codebase is…@tottinge #qconlondon

    Why BDD Can redeem Agile

    by Matt Wynne

    Ben Basson attended this session:

    Matt gets quickly to the point, identifying the common problems faced by software evolution teams:

  • Predictability - is the team delivering on time?
  • Communication - are they working together well as a team (including sum disciplines, i.e. testers, product owners, developers)?
  • Quality - strongly related to the two above - it causes frustration for the team if there are lots of problems or defects.
  • He goes on to intricate that it's viable to counteract these by addressing them directly:

  • Small pieces (solve predictability by breaking things up properly).
  • Collaboration (communicate and really work with each other)
  • Technical discipline (TDD, refactoring)…
  • Explaining why TDD (Test Driven Development) is important, Matt says that automated tests are essentially warning lights, and whether you add them before or after writing code, you guard against the risk of regression later on when making changes. The crucial thing that this enables you to execute is refactoring - which he says is a horrible technical term that means that product owners and customers don't necessarily judge it is a necessary practice, when in fact they should exist interested as it is a key piece of maintaining the health of their software….

    Matt concludes by proverb that you can't just cheat on agile, you occupy to require excellent communication, occupy excellent collaboration and occupy excellent code; this is where the agility comes from in agile.

    Twitter feedback on this session included:

    @shanehastie: #qconlondon #mattwynne How BDD can redeem Agile, essential point: Scrum != Agile http://t.co/TFtXRaZwVt

    @shanehastie: #qconlondon @mattwynne small pieces, collaboration and technical discipline are frequently missing in many "agile" implementations

    @Hylke1982: #BDD / #ATDD helps us with delivering small pieces, collaboration and with technical discipline #qconlondon

    @Hylke1982: BDD is a conversation between different roles to define and drive out specificatons in a structured understandable way. #qconlondon

    @V_Formicola: “...test after is ok, but if you want to execute it right you TDD” @mattwynne #qconlondon

    @shanehastie: #qconlondon @mattwynne #BDD Conversations matter because ignorance is the bottleneck in software development

    @rvedotrc: “Writing down the list of things you don’t know [business rules, examples, questions] is very helpful” - @mattwynne #qconlondon

    @shanehastie: #qconlondon @mattwynne 3 Amigo's workshop - customer, developer, tester disburse 20 mins to wait on understand the needs and express them usefully

    @V_Formicola: “Analysing stories as a small group breeds empathy in a team and brings everyone at the selfsame flush of understanding” @mattwynne #qconlondon

    @shanehastie: #qconlondon @mattwynne there is no excuse for not using a ubiquitous language - just exist consistent!

    @shanehastie: #qconlondon @mattwynn The bit of TDD that everyone forgets is Refactoring. Refactoring should exist a constant activity!

    @V_Formicola: Technical discipline….is what is missing in teams which are doing “half-agile” @mattwynne #qconlondon

    @shanehastie: #qconlondon @mattwynn You can't remain agile without cleanly code! Refactor it, and that needs TDD as the warning lights about regression.

    @merybere: You will fail unless you are listening to The tests #BDD #qconlondon

    @Hylke1982: Product owners should/must require refactoring to ensure agility #BDD #qconlondon

    @shanehastie: #qconlondon @mattwynn To occupy existent agility you requisite Excellent communication & excellent code

    @paulacwalter: A code foundation without refactoring is relish a dirty kitchen. You risk injury and destitute hygiene when you trip up #qconlondon @mattwynne

    @_yowan_: You can't cheat on Agile practices and anticipate things to work #qconlondon http://t.co/gz29NahE4W

    @V_Formicola: You can’t cheat on Agile...it requires commitment..you requisite to occupy worthy communication...you requisite to occupy worthy code @mattwynne #qconlondon

    @markhobson: worthy reaffirming talk by @mattwynne. No agile w/o refactoring, no refactor w/o tests. #qconlondon cc/@BlackPepperLtd http://t.co/dqRqcPYgnn

    The business of Front-end Development

    by Rachel Andrew

    Twitter feedback on this session included:

    @DevOpsMD: Don't become an expert in one brand of hammer. Become a master carpenter. Develop timeless skills. --Rachel Andrew #qconlondon

    @wonderb0lt: You procure a lot of stuff for free if you're just doing it well. @rachelandrew #qconlondon

    @V_Formicola: @rachelandrew “Progressive enhancement. Start with the core experience. They ship. They iterate.”. Sounds relish Agile to me. :) #qconlondon

    @nimpedrojo: You can't execute everything.You can execute something . @rachelandrew in #qconlondon

    @DevOpsMD: They don't discontinue playing because we're old; they grow develope because they discontinue playing -- @rachelandrew #qconlondon

    @rajshahuk: How many people actually conclude up with the 'not invented here' problem and travel of and create something new? via @rachelandrew #qconlondon

    @rajshahuk: Flip side is that they are apprehensive to create and become more reliant on frameworks! I judge this is more true. @rachelandrew #qconlondon

    @dsommerville_nw: too a huge fan of: Ship the core experience and *then* iterate [via progressive enhancement]; exercise tools lightly @rachelandrew #qconlondon

    When Arduino Meets Application Server: admire at Second Sight

    by Holly Cummins

    Twitter feedback on this session included:

    @deonvanaarde: IoT: Websphere Liberty app server running on @holly_cummins homemade ball on pcDuino over WiFi... Cool!! #qconlondon http://t.co/2JXbyoi6MO

    @techiewatt: IoT track at #qconlondon with demonstration by @holly_cummins of a literally throwable websphere server with sensors! http://t.co/3OBxBmPnbl

    @lauracowen: The world's first cuddly, throwable application server, with creator @holly_cummins. Running #WASLiberty #qconlondon http://t.co/FcDuyaASj8

    Refactoring to Functional

    by Hadi Hariri

    motwin attended this session:

    Hadi showed how some OO patterns can exist turned into a functional style. T exercise functions to pass behavior t was the motto and cooking recipe. Thus, it demonstrated how to rewrite a bunch of classes that implement the template patterns into one class. Again, thanks to the “use functions to pass behavior” principle. The Strategy pattern is too a superb candidate for being rewritten in a functionalish style: the strategy has only to exist encapsulated as function. Elegant code and less code: wintry ! And as matter of fact, “Patterns of yesterday can become anti-patterns of today” (which is more or less a citation I don’t remember the author). Another use-case of Hadi is when the dependencies of a class grow. Firstly, it may exist of value the code odor bad. Secondly, it may exist of value that they occupy lots of dependencies just because they requisite to exercise dependencies behavior. And as in a functional style, you can “use functions to pass behavior”, … you procure the trick, now. In functional programming, as a role can recrudesce a function, you can procure a pipeline of functions call. That can too contribute to compose the code shorted and more readable. Hadi just warned a too long pipeline can exist in spin unreadable… so, exist judicious and encapsulate behaviors in meaningful named functions to avoid a too titanic chain of functions.

    Scala in the Enterprise

    by Peter Pilgrim

    Will Hamill attended this session:

    Peter started with some simpler Scala examples of pattern matching, reducing boilerplate compared to Java code, collections operations and Futures for asynchronous course processing. HSBC were used as an illustration of a larger enterprise that has some Scala adoption along with GOV.UKwho exercise the Play Framework in some places. Peter said that Scala adoption depends on a confident and talented team, and delivering something working was the key to proving viability. …

    Scala was then demonstrated for the selfsame types of behaviours as the Java 8 examples. … Peter covered role composition, partial functions, tail recursion, functions returning other functions and measure map reduce ilk examples. Futures and Promises were too briefly covered, though I judge that should exist focused a itsy-bitsy more given the power of this in Scala compared to Java.

    Peter finished his talk by stating that while Java 8 is new, Scala is here already and can exist used as a full-fat functional language as well as object-oriented. Java 8 however changes things by making functional paradigms accessible to a much wider and arguably slower-changing audience.

    Protocols - the Glue for Applications

    by Torben Hoffmann

    Will Hamill attended this session:

    Torben advocates Erlang for learning how objects should decipher problems by communicating with each other, rather than ‘single page programming’ where people learn only to develop with an understanding only of the current class. Torben proclaimed the ‘golden trinity’ of Erlang: fail fast, failure handling, participate nothing. Including failure handling as a specific case in your protocol means you should exist able to handle failure gracefully. In Java world, failures are not tolerated and unexpected exceptions cause your process to die. In Erlang world, failures are embraced as alternate scenarios and managed.

    Torben gave an illustration of a financial application for a simple stock exchange. Buyers post purchase intentions, sellers post sale intentions, deals betide when the seller expense <= buyer price. In Erlang, this will exist modeled using one buyer process and one seller process per sale interaction, communicating by sending messages that shape the sale protocol. gproc, a process registry, would exist used as a pub/sub mechanism for buyers and sellers listen for messages of intent to sell/buy. After expense conditions are met, the sale is confirmed with a three-way handshake.

    Failure is handled in the message protocol such that when the buyer or seller dies after the initial message of intent (determined by response timeout or monitoring the other process) then the processes can simply restart the interaction. If a party dies after the first piece of the handshake, e.g. buyer dies before getting sale complete message after seller closed sale on their side, a restart of the process will the buyer back to the previous state. A supervisor process is commonly used in Erlang to monitor worker processes and handle restarts. Other options for handling failure in the stock exchange are to sustain a transaction log per-process in order to easily replay until the terminal state. Alternatively a central ledger process could exist used which tracks completed deals and allocates buyer and seller processes deal IDs so they can link back up when they fail.

    Twitter feedback on this session included:

    @jimshep: These 2 tools are sum you requisite to build mission-critical systems @LeHoff #QConLondon http://t.co/fQFaA1Y76G

    @dthume: Erlang fail relish a flash error handling - "if you don't know what to do, what's the point in living?" @lehoff at #qconlondon

    @solsila: If a process makes a call with incorrect data, it deserves to die @LeHoff on protocols #qconlondon

    @willhamill: if you call the API with the wrong data, you deserve to die - @LeHoff on process error handling in Erlang #qconlondon

    Product Ownership Is a Team Sport

    by Shane Hastie

    Twitter feedback on this session included:

    @NitinBharti: Product management is a "value management" *team* sport #qconlondon @shanehastie http://t.co/orWdN63iXR

    @solsila: Velocity is a measure of work (cost), not value. @shanehastie #qconlondon

    @lissijean: edifice more is not always better. Recognize when the value flattens out. @shanehastie #qconlondon http://t.co/2xHhcnOZeh

    Product thru the Looking Glass

    by Chris Matts

    Twitter feedback on this session included:

    @shanehastie: #qconlondon @PapaChrisMatts The agile test: Deliver quality: Deliver quality (bugs, pert UX) : Short Iterations (max 1 month)

    @lissijean: They don't want a tea bag, they want the value they procure from a cup of tea - quenching thirst. #prodmgmt #qconlondon @PapaChrisMatts

    @shanehastie: #qconlondon @PapaChrisMatts Product management is the realm of hypothesis - they judge that the requisite exists and meeting them matters

    @lissijean: After you've gathered insights you requisite to manage them. dissect by value and personas. @PapaChrisMatts #qconlondon

    @lissijean: Testing hypotheses is a #Kanban process not scrum. Don't try to shove it into a sprint. @PapaChrisMatts #qconlondon http://t.co/XVLqrwPn5D

    @shanehastie: #qconlondon @PapaChrisMatts getting the audience to build UI designs and vote on them in the session. tainted concept terminator works @lissijean

    The tainted concept Terminator

    by Melissa Perri

    Yan Cui attended this session:

    We often start off doing things right – they test and iter­ate on their ideas before they hit the mar­ket, and then they conclude up with some­thing that peo­ple want to use. But then they just sustain on build­ing with­out going back to find­ing those inno­v­a­tive ideas that peo­ple love. …

    We can tumble into the build trap in a num­ber of ways, including:

  • pres­sure from stake­hold­ers to always release new fea­tures
  • arbi­trary dead­lines and fail­ure to respond to change – set­ting dead­lines that are too far out and not being flex­i­ble enough to reconcile to change
  • “build­ing is work­ing” men­tal­ity – which doesn’t allow time for us to step back and judge if we’re build­ing the right things…
  • So how execute you become the tainted concept Ter­mi­na­tor, i.e. the per­son that goes and destroys sum the tainted ideas so they can focus on the superb ones? They can start by iden­ti­fy­ing some com­mon mis­takes they make.

    Mis­take 1 : don’t rec­og­nize bias…

    Mis­take 2 : solu­tions with no problems - When peo­ple sug­gest new ideas, most of the time they foster to the table with solu­tions. Instead, they requisite to start with the WHY, and focus on the prob­lem that we’re try­ing to solve….

    Mis­take 3 : build­ing with­out testing - When they procure stuck in the build trap they don’t tend to test their assump­tion, as they tend to com­mit to one solu­tion too early. Instead, they should solicit many solu­tions at first, and procure peo­ple off the fix­a­tion on the one idea….

    Mis­take 4 : no suc­cess metrics - Another com­mon mis­take is to not set suc­cess met­rics when they travel and execute exper­i­ments, and they too don’t set suc­cess met­rics when build­ing new features.

    Twitter feedback on this session included:

    @paulacwalter: Figuring out what to build is the hard part. Don't procure stuck in the "building is working" trap. @lissijean #qconlondon

    @shanehastie: #qconlondon @lissijean in software they procure stuck in the build trap - just build the next piece, discontinue and travel back to check that soundless want it

    @shanehastie: #qconlondon @lissijean Putting out more features doesn't compose your product more attractive, just bloated

    @shanehastie: #qconlondon @lissijean The most essential piece of the product manager role is the aptitude to yell No

    @_yowan_: Feature ideas are not your babies inspiring talk by @lissijean #qconlondon http://t.co/Yjemn9rHji

    @shanehastie: #qconlondon @lissijean concept terminator: notice differences among customers and businesses

    @quaasteniet: Now The tainted concept terminator where @lissijean talks about killing tainted ideas even more useful than killing tainted code ;) #qconlondon #TOPdesk

    @shanehastie: #qconlondon @lissijean tainted concept terminator: Change perspective

    @Helenislovely: edifice in questions that wait on evaluate features and therefore truly prioritise. Dealing with ideas @lissijean #qconlondon

    @shanehastie: #qconlondon @lissijean tainted concept terminator: Focus on the problem

    @shanehastie: #qconlondon @lissijean tainted concept terminator: Is this a problem they can and want to solve?

    @shanehastie: #qconlondon @lissijean tainted concept terminator: respect many solutions

    @shanehastie: #qconlondon @lissijean tainted concept terminator: Test the viable solutions very quickly for very low investment

    @shanehastie: #qconlondon @lissijean tainted concept terminator: set success metrics when you identify the experiment, then CHECK THE RESULTS

    @shanehastie: #qconlondon @lissijean tainted concept terminator: Set goals early (late goals will exist adjusted to their bias) and compose certain they align with KPIs

    @Helenislovely: Thinking of 2 other biases that exterminate their innovation: loss aversion and attachment to their own creativity. @lissijean #qconlondon

    @solsila: The faster you exterminate the tainted ideas, the more time you occupy for the superb ones. Becoming a tainted Ideas Terminator w/ @lissijean #qconlondon

    The Sensemaker Method

    by Tony Quinlan

    Twitter feedback on this session included:

    @shanehastie: #qconlondon @tquinlan direct questions never give you the truth - requisite to procure underneath to procure meaning

    @shanehastie: #qconlondon @tquinlan is your solution actually creating the problem?

    @shanehastie: #qconlondon @tquinlan "on average" doesn't help, what you want is specifics to understand actual needs

    @shanehastie: #qconlondon @tquinlan collecting stories as people experience the system/environment allows meaning to exist exposed

    @shanehastie: #qconlondon @tquinlan context and second matters - people are complex, can't simply extrapolate

    @Helenislovely: meaning is not in the content you're reading. Its the context and intertextuality. @tquinlan #qconlondon

    @shanehastie: #qconlondon @tquinlan "red shirt" is an assessment of life expectancy not a style statement (#startrek) #context matters

    @Helenislovely: assemble smart feedback @tquinlan connects to @LMaccherone point about using data to change the tone of conversation. #qconlondon

    @shanehastie: #qconlondon @tquinlan collect stories with the audience's meaning; scrutinize for patterns that emerge; foster up with activities to help soltn

    Responding Rapidly When You occupy 100GB+ Data Sets in Java

    by Peter Lawrey

    Will Hamill attended this session:

    Peter described how he believes that a modern system should exist reactive: responsive, resilient and elastic. When your weapon of option is the JVM, you can process data much faster when you can map your entire data set into memory (given I/O bottlenecks, I’m certain this is lawful for almost any language). However, what happens when you stir into the realms of very great data sets - which in Java land is pretty much anything beyond 32GB?…

    In terms of accessing more memory on the JVM, going beyond 32GB on measure compute platforms means you’ll requisite to jump up to 64-bit address references, which though increasing available memory zone too reduces the efficiency of CPU caches due to increased expostulate size. Garbage collection of such larger memory spaces too starts to become a problem, with a concurrent collector being needed to avoid stop-the-world execution pauses.

    Peter described how the Azul Zing concurrent collector was an option for tackling this issue up to a given size, as for memory sets of around ~100s GBs their garbage collector will discharge with minimal execution impact. A different approach would exist to exercise TerraCotta BigMemory as a memory management layer inside your application, allowing the application to exercise off-heap memory, though the disadvantage is needing to explicitly build applications against their library so it can’t exist injected in to existing applications as a mitigation in the selfsame course using Azul Zing could be.

    When addressing bigger data sets of up to 1TB in Java, the NUMA region confine kicks in at around 40 bits of physical memory (40 bits for Ivy Bridge and Sandy Bridge generation Intel CPUs, 48 bits for Haswell generation CPUs). Addressing beyond 40 bits requires using a 48-bit virtual address space, with data paged in on demand. The 48-bit confine then pushes the threshold to 256TB in CentOS, 192 TB in Windows and 128TB in Ubuntu. I can’t wait for someone to exist quoted at this point proverb “128TB will exist enough for anyone!” that they can sum scrutinize back upon and laugh in 2025 :). pitiful further up the orders of magnitude, a 1PB (Petabyte!) memory space can exist achieved by mapping the address tables themselves into the main addressable space, in order to achieve paging of the virtual space.

    Twitter feedback on this session included:

    @peter_pilgrim: Reactive system design to respect if your data size >32GB from @PeterLawrey #qconlondon #in #java #performance http://t.co/2VJvkKs903

    @charleshumble: “32 bit i soundless apropos in IoT. If you occupy a digital toaster it's unlikely to requisite more than 32 bits." @PeterLawrey #qconlondon

    @Idris_Ahmed251: x86 computers... Your toaster will never requisite that! #qconlondon @peterlawrey

    @charleshumble: Many systems occupy NUMA regions that are limited to 1TB. @PeterLawrey #qconlondon

    @charleshumble: PetaByte JVMs for a exercise case that needs random access without going across networks @PeterLawrey #qconlondon http://t.co/9PyGDF8ilC

    The know-how of Protocol Design

    by Pieter Hintjens

    Twitter feedback on this session included:

    @miguel_f: Don't crash user code! Once again: don't crash user code! @hintjens #qconlondon

    @marcusolsson: Versioning is not an excuse to crash contracts. @hintjens #qconlondon

    Microservices Are Too (Conceptually) Big

    by Philip Wills

    Pere Villega attended this session:

    In this talk, Philip Wills, Senior Software Architect at The Guardian, explains how The Guardian moved from a monolith to Microservices. Currently they release around 40 different services to production each week.

    When they were a monolith they started to find some problems. … They too had a concern with limiting the scope of failure. The monolith allowed embedding some microapps into specific places, but they hit performance and coupling issues soon enough. …

    So they moved to solitary responsibility apps, focused on resilience and with limited scope (you can suitable it in your head)….

    An essential point he raised is that they try to avoid sharing libraries across services, due to the amount of contention they cause. They respect this a terminal resort.

    Will Hamill attended this session:

    Phil explained that the main understanding The Guardian had pursued a microservices architecture was for faster innovation in a lofty pressure media marketplace. Independent teams were needed for the different functional areas of the platform, and as on the develope platform taking something experimental from a Hackday and putting it into production was prohibitively expensive, the organisation wanted the teams to exist able to work independently from each other and release rapidly without overhead….

    With the ‘micro app’ approach, teams at The Guardian were developing independent products with ownership inside the team. This made removing and replacing parts much easier than the throe caused when they tried to execute this with the monolith application. Teams were no longer conditional upon each other for releases and making changes to their interfaces backwards compatible reduced interdependencies. Phil mentioned how it was essential for each team to own their own datastore and to prohibit integration via DB so as to maintain the profit of cleanly defined APIs.

    Each application had a solitary responsibility, and a solitary key metric that would command teams about its performance, in terms of that responsibility. Different applications change at different rates, so they want them not to depend on each other, as this would restrict them to the lowest common denominator.

    Twitter feedback on this session included:

    @stefanoric: #qconlondon Some lessons from The Guardian about microservices: separate teams, confine scope of failures, design for things to die.

    @danielbryantuk: Fail-fast for the win in a monolith and microservice integration @philwills at #qconlondon

    @danielbryantuk: JSON is a really destitute interface mechanism. We're looking at Thrift to provide strong-typing for protocols @philwills at #qconlondon

    @stefanoric: #qconlondon The Guardian is considering ditching JSON and travel with Thrift

    @rvedotrc: “On AWS, you can throw more hardware at it, or spin it off and on again. This solves a surprisingly great amount.” @philwills #qconlondon

    @danielbryantuk: arresting to descry the Guardian focusing on 'single responsibility apps'. Find one key metric for each app that measures impact #qconlondon

    @adrianmouat: Everything was crashing, but nothing was causing a problem @philwills on the advantages of microservices at #qconlondon

    @rajshahuk: Yeah! The Guardian try to avoid shared libraries via @philwills #qconlondon

    Microservices: Software That Fits in Your Head

    by Dan North

    Will Hamill attended this session:

    Dan has argued for some time that software itself is not an asset but a liability, so producing more code is less valuable than making the software more effective. The costs (as well documented across the industry) cover not just creating the code, but understanding and maintaining it on an ongoing basis. The biggest problem to software evolution is the code in the system that nobody knows about, as this is expensive and risky to maintain. The best course to deal with this is to stabilise the offending code or exterminate it off.

    Dan describes two complementary patterns for understandable, maintainable code: ‘short software half-life’ and ‘fits in my head’. …

    Short half-life results from the replaceability of discrete components with limpid boundaries and defined purposes and responsibilities. …

    ‘Fits in my head’, a metric originally inspired by the length of a class on screen compared to James Lewis’ head but not generally referring to the aptitude of a person to understand the conceptual entire of a component at a given flush of abstraction, is used to judge whether or not other people on the team can understanding about the component with the selfsame context as whoever designed or first implemented it. This is useful as the contextual consistency for the person understanding the component is more essential than homogeneity across implementation methods, so that liberty is left to meet the needs inside the component in whichever course is best, but the people making decisions about it will foster to similar decisions as the designer/implementer would have. When you occupy this contextual consistency you can confidence that the decisions people compose that result in different outcomes occupy been driven by different needs rather than arbitrarily.

    Dan described the approach of splitting these components into services that together suitable the business requisite as a ‘replaceable components’ style (no doubt intimate to anyone who understands the original intent of SOA). To reduce coupling these components should exist isolated from each other and should communicate by passing messages through well-defined APIs. Implicit coupling between components can exist identified by heavy exercise of mocks - over-dependence on mocking implies you are too tightly coupled to the behaviours of other components.

    Pere Villega attended this session:

    We don't custody about code, but about the business impact. That is to exist of value that the code is not an asset, is a cost they assume to obtain the business impact. Writing code, changing code, and understanding code; they are sum costs.

    As a consequence they want to stabilise their code or, alternatively, exterminate it relish a flash and supersede it by less-costly code. As it happens, the patterns that facilitate this process lead to Microservices.

    The first pattern is to occupy a short software half-life. An application can exist long lived, but the code that composes that application may not be. efficient teams tend to occupy a very short code half-life, in which after a few weeks the code has changed a lot and entire sections occupy been replaced or moved. This keeps the costs associated to code low.

    To facilitate a short half-life they want to write discrete components, with limpid boundaries, and limpid purpose and responsibility. The boundaries betide at many levels: deployment (containers), design (DDD), etc. A limpid purpose reduces uncertainty….

    Another pattern is to respect anything that doesn't suitable in your head as too big. …

    A Microservice can exist a ilk of replaceable component architecture, if you optimise for replaceability and consistency. Don't optimise for size, smaller is not necessarily better, more replaceable is better. And exterminate code fearlessly.

    Twitter feedback on this session included:

    @rvedotrc: The goal of software evolution is NOT to produce software – it’s to sustainably deliver positive business impact @tastapod #qconlondon

    @V_Formicola: What is their business about? “Sustainably minimise lead time to business impact.” @tastapod #qconlondon

    @trisha_gee: Code is not the asset, code is the cost @tastapod at #qconlondon http://t.co/gqtnarm5xv

    @jimshep: productive != effective- @tastapod #QConLondon http://t.co/LGSmbZ3mok

    @rvedotrc: Writing code is the annoying time-expensive piece that gets in the course of solving problems (paraphrasing @tastapod #qconlondon)

    @stefanoric: Code should exist stabilized or killed off Dan North #qconlondon

    @solsila: Heisenberg consequence in code: the issue occurs until you try to keep it! #thisexplainsalot @tastapod #qconlondon

    @trisha_gee: An application can occupy a long life, but the code should occupy a short half life @tastapod at #qconlondon

    @rvedotrc: “If I can’t understanding about [a component], I can’t exterminate it” @tastapod #qconlondon

    @paulacwalter: Documentation is valuable. Documenting everything a shocking dissipate of time. Tricky bit is knowing what to document. @tastapod #qconlondon

    @rajshahuk: Killing code is refactoring, it isn't brutal -- @tastapod #qconlondon

    @V_Formicola: “I don’t relish to scrutinize at code that doesn't suitable in my head” @tastapod @boicy #qconlondon

    @V_Formicola: Familiarity is different than simplicity@tastapod #qconlondon

    @AlibertiLuca: #qconlondon Mocking is an anti-pattern @tastapod

    @axhixh: I am going to write best code I can that I don't custody about. @tastapod #qconlondon

    No Free Lunch, Indeed: Three Years of Microservices at Soundcloud

    by Phil Calcado

    Pere Villega attended this session:

    SoundCloud moved from a Sacrificial Architecture to Microservices. … Before you can start with Microservices, you requisite 3 things:

  • rapid provisioning of servers (or containers or vm's)
  • basic monitoring
  • rapid app deployment with a short turnaround
  • For provisioning, SoundCloud moved from AWS to their own datacenter in Amsterdam, although they soundless exercise S3 and some other Amazon services….

    On telemetry they organize a similar issue: the tools available at 2011 weren't great. The common tooling was a propel model based on StatsD, Graphite and Nagios. Engineers they hired at that time wanted a pull model so they developed Prometheus which works along Icinga to provide better data. When they moved to Microservices their monitoring didn't break. …

    Regarding their pipeline at the birth they had 2 different pipelines: one for build, one for release. Customisation and other factors ended up creating 7 different deployment scripts. Currently they exercise Docker to rush tests when in development. Jenkins takes custody of edifice and packaging the application as a deb package, and they exercise that for deployment. They occupy not adopted Docker yet as they don't want a tenacious coupling.

    Will Hamill attended this session:

    The three aspects of this that Phil organize most essential at Soundcloud were rapid environment provisioning, basic monitoring, and rapid application deployment. The first of these, provisioning, looked a itsy-bitsy different in 2011 than it did now when Soundcloud were preparing for what they thought would exist the “microservices explosion”. With Heroku as the example, usingDoozer for service discovery, LxC containers and the 12 Factor principles, Soundcloud managed to consequence together a provisioning platform much better than any other complete solution around at the time….

    In terms of telemetry and monitoring (another spicy topic at QCon this year), Phil described how in 2011 the tooling available was not quite what it is today, and dissatisfaction with some common tools led Soundcloud to build their own system. Interestingly, some of the former Google Site Reliability Engineers that had been hired by Soundcloud advocated this as they missed the minute monitoring when pitiful away from the Google platform. pitiful from a solution of Statsd, Graphite and Nagios, Soundcloud developed and subsequently open-sourced Prometheus as their metrics & monitoring system, with exercise of Icinga and PagerDuty for alerting.

    Teams at Soundcloud were too reorganised - component teams became feature teams with more plumb responsibility (surprisingly no definite call out for Conway’s Law).

    The second of the three aspects Phil talked about was deployment. Soundcloud moved from a two-pronged delivery pipeline using compose and Jenkins where Jenkins ran many sets of tests but did not build the artefacts which would actually exist deployed, to a singular pipeline of Docker containerisation for unit/integration tests before confide to source, then Jenkins running a wider set of tests on the latest code, generating packages either for including in an AMI for AWS deployment, or for containerisation to allow developers to rush a ‘mini-soundcloud’ for dev/testing purposes.

    Twitter feedback on this session included:

    @danielbryantuk: People are always migrating to something from Rails @pcalcado on the current #microservice migration trends at #qconlondon

    @philwills: .@pcalcado says at @SoundCloudDev their engineers with a javascript background write scala, so not just us at @gdndevelopers #qconlondon

    @rvedotrc: “When you occupy a monolith, and it breaks overnight, you know where the problem is: it’s in the monolith” @pcalcado #qconlondon

    @markhneedham: They had Scala people getting very confused about JavaScript... #qconlondon @pcalcado

    @tastapod: “Don’t forget companies that open source cloud, monitoring, lservices, etc. got it wrong a bunch of times first!" @pcalcado at #qconlondon

    Operating Microservices

    by Michael Brunton-Spall

    Pere Villega attended this session:

    His talk applied to Microservices understood as 'vertically aligned stacks that communicate via simple and measure interfaces'. In this context ownership of data matters, you don't want to participate data. Teams own the code, people outside the team don't modify that code. Teams too own the runtime, they choose what they want to use, even Erlang in a supposedly JVM shop. …

    Microservices are [using] Conway's Law. Management and developers admire them because:

  • small owned services that can exist updated more often
  • teams can stir relish a flash and crash stuff
  • teams can own the entire stack
  • On the other hand infrastructure teams loathe them because:

  • small owned services that can exist updated more often. But changing things breaks things.
  • teams can stir relish a flash and crash stuff. Ops want to exist late and stable, avoid breaking things
  • teams can own the entire stack. Ops are not required, thus they lose control over security …
  • The best starting point it to just rush 1 Microservice, by itself, successfully. Microservices in the small. You requisite to:

  • make certain you are able to execute it
  • automate your infrastructure (use of containers is not necessary)
  • create a foundation image for your service
  • deploy it fast, with a time-to-server of a few minutes, not hours …
  • You requisite monitoring tools that are effortless to hook into. …

    You must automate your deployment. It doesn't requisite to exist complex, it can exist as simple as executing a self-contained Jetty, but sustain a log of the deploys done including the commits that were released. And you must give the keys to the evolution team, as well as root. And give them pagers too: if they crash it, they fix it. But to execute that they requisite replete access….

    At this point point you occupy 1 Microservice running. Now repeated to procure 10, 100, ... Microservices in the large.

    When you occupy many services running, they are going to fail in more spectacular ways than their equivalent monoliths. They are not complicated (like a car), but intricate (like a traffic system) in which the root cause may exist far-off in time and space. Due to that, diagnosis tools are a must.

    Twitter feedback on this session included:

    @danielbryantuk: I've never known an ops team who relish the phrase 'move relish a flash and crash things' @bruntonspall on operational microservices at #qconlondon

    @rvedotrc: Ops teams loathe microservices because you can change stuff, and change it without them. @bruntonspall #qconlondon

    @jabley: lservices as a course of subverting Conway's Law and redesigning your organisation – arresting concept from @bruntonspall #qconlondon

    @danielbryantuk: Simple, complicated, intricate <- sum microservice architectures are complex! @bruntonspall on complexity at #qconlondon

    @markhneedham: We're edifice the new legacy services #qconlondon @bruntonspall http://t.co/piNTvakhmc

    @kronk2002de: Operations teams should act more relish consultants @bruntonspall #qconlondon

    @V_Formicola: The first person pays the price, the next will pave the road, the following will occupy a road to walk on. @bruntonspall #qconlondon

    @danielbryantuk: scrutinize at the 90th, 95th and 99th percentile when dealing with microservice telemetry <- this stuff matters at scale #qconlondon

    Protocols of Interaction: Best Current Practices

    by Todd Montgomery

    Will Hamill attended this session:

    Todd began by describing some of the issues of service communication that can exist observed and sometimes addressed in protocols. Data loss, duplication and reordering as the most common issues tackled and can betide even in protocols portrayed as ‘reliable’. In TCP, for example, connections can exist closed or traffic interfered with by proxies.

    In request/response synchronous comms, throughput is limited by the round trip time for each communication multiplied by the number of requests. Asynchronous communication can reduce this to closer to the round trip time for a solitary communication but responses require correlation to original requests and this therefore adds complexity. Ordering of messages is an illusory guarantee, as the compiler, runtime environment and CPU can change ordering in existent terms, so ordering is imposed upon events by the protocol….

    In scenarios when multiple recipients are sent the selfsame data set, if each recipient requests a retransmit of a different piece of the data set, it will cause a retransmit of the entire set even if between them the entire set was accepted - a common problem when distributing loads across horizontally scaled consumers. Solving this is non-trivial, and Todd recommends a combination of patience, and waiting to listen for viable retransmit requests from sum recipients. …

    For queue management, Todd recommends using a bound total queue length and using back pressure or even dropping messages to ensure minimisation of the queue contents. Extended queue lengths leads to ‘buffer bloat’ and delays between services (large queues between work states being a cause of delays should exist known to anyone intimate with queuing or ToC).

    Todd concluded by summarising that existing protocols such as TCP, Aeron and SRM, are replete of patterns for tackling complicated communications problems, and that they should scrutinize to how others occupy solved these problems when working on their own systems.

    Pere Villega attended this session:

    Protocol definition matters. Protocols not only define how they format and deal data, they too define how execute they interact with something. Protocols of interaction matter much more now that they are embracing Microservices, and they are a worthy solution for many of the problems raised by them. Internet (in fact, any network) is an hostile environment were data can exist lost, duplicated, reordered, etc. And TCP is not a safeguard from those issues. They will happen.

    The main takeaway of the talk: Protocols are a affluent source of solutions to complicated problems.

    How They Build Rock-solid Apps and sustain 100M+ Users jubilant at Shazam

    by Savvas Dalkitsis & Iordanis Giannakakis

    Twitter feedback on this session included:

    @IsraKaos: Test first, they organize is actually easier @iordanis_g @geeky_android Now even in Android!! #qconlondon

    @RogerSuffling: #Shazam and how to execute rock solid builds. cheerful to descry testing is central #qconlondon http://t.co/AsDwh2LbEt

    @trisha_gee: I actually organize the code version of the test easier to understand than the user story! @geeky_android at #qconlondon http://t.co/VkztZDl3aT

    @trisha_gee: Unit tests that retract 3 or 4 seconds to rush are not acceptable @geeky_android at #qconlondon

    @trisha_gee: Cognitive load is lower when you don't exercise a DI framework in Android - @iordanis_g at #qconlondon

    @trisha_gee: The power of manual testing comes in when you're trying to execute things relish check your animations are smooth @iordanis_g at #qconlondon

    Tales from Making Mobile Games

    by Jesper Richter-Reichhelm

    Twitter feedback on this session included:

    @IsraKaos: With 20 internal teams (2-32) if one fail it's just one. But when 1 succeeds, sum 20 can profit from it @jrirei #qconlondon

    @trisha_gee: Feature switching useful not just for A/B testing to descry what's effective, but too to spin off features with bugs @jrirei at #qconlondon

    @IsraKaos: While they waited for the iOS version to exist approved, the Android guys released 8 times in their prevalent cycle Hehehehehe @jrirei #qconlondon

    @JanSabbe: I admire Apple, but... I'm starting to admire Android even more @jrirei #qconlondon

    @ellispritchard: Apple loosing admire to Android due to want of staged roll-out/slow iteration #qconlondon

    Infrastructure Built in Go

    by Jessie Frazelle

    Will Hamill attended this session:

    Jessie began with giving an overview of what Docker is and what it’s for: a runtime for application containers, which are a subset of Linux kernel features such as namespaces, cgroups and pivots. Docker allows you to ‘containerise’ your application and produce a fully static binary containing sum dependencies, giving ease of installation and deployment. This can exist as basic as scp the container to the target server and bootstrap the binary. Jessie too informed us that Docker support would exist coming to Windows, which would bring the lineup to four main platforms (the others being Darwin, BSD Unix and Linux).

    Jessie too described a distributed message platform in travel called NSQ which is used to wait on scale the Docker project in a number of ways. NSQ is used by the build app responsible for listening to GitHub hooks to trigger builds and deployments, used by the Docker master binary build to rush on every propel to the master branch, and used by the app which automates edifice and publishing docs from the code. The team at Docker rewrote a Python-based Jenkins plugin in travel to handle the pull requests, which too uses NSQ to discharge housekeeping such as checking for signed commits, labels and documentation comments.

    The travel language was chosen by the Docker team for a number of reasons: it’s simple, has common useful tools such asfmt, vet, lint, and others for documentation and tests. Some of the issues they organize when using travel were in package versioning across the teams and inconsistency in approaches to this. The travel test framework is too soundless basic and not as fully-featured as those in other languages (like JUnit for example) and so lacks some useful aspects such as setup and teardown step definitions. The travel community is too smaller than that of other languages and as a result is soundless helpful, friendly and comparatively drama-free.

    Twitter feedback on this session included:

    @paulacwalter: A container is a magical thing that doesn't really exist  in the wild. @frazelledazzell #qconlondon

    @csanchez: travel is a neutral language, not relish Java. It's the Switzerland of languages @frazelledazzell #qconlondon http://t.co/cD2q3SHsnf

    Microservices, Micro Deployments and Devops

    by Alois Reitbauer

    Sebastian Bruckner attended this session:

    An advanced micro service talk with the focus on creating resilient, changeable services and how to operate them. Especially his anti- or problem patterns in a micro service architecture were very interesting.

  • The Gatekeeper – Many outgoing dependencies
  • likely not very “micro”
  • complex application logic
  • very deployment sensitive
  • Single Point of Failure – Many incoming dependencies
  • central application service
  • very delicate to scaling
  • user facing impact
  • Hub – Many incoming and outgoing dependencies
  • the worst thing to happen
  • “legacy” migration
  • highest deployment risk
  • Sebastian Bruckner attended the microservices open space:

    Every track on the QCon had a slot with an open space. An open space doesn’t occupy a prepared talk but several slots where the attendees can promote topics they are interested in and want to talk about. The microservice open space was the first and only open space I attended at QCon. The topics were surprisingly advanced, I really enjoyed it. I can only recommend you to try this format.

    Impressions expressed on Twitter included:

    @stealthness: Day 1 of #QConlondon 2015 and the QEII Conference headquarters had compose over since last. Looking very sleek and modern. http://t.co/WMRCpGNvpp

    @QuackingPlums: #qconlondon is worth it every year just for this view… http://t.co/dDD5CPj51O

    @V_Formicola: Positively impressed by the % of women at #qconlondon, the most I occupy ever seen at a technology conference! Are things finally changing?

    @lauracowen: #qconlondon execute some very superb food. Nom http://t.co/CK8CSHdxJf

    Ben Basson’s takeaways were:

    It seems relish a lot of teams are struggling to properly implement agile practices, and I'm cheerful to descry that I'm not the only one who has experienced some of these problems over the terminal few years. I got a lot of food for thought, but what I organize worthy about QCon was the focus not only on ideas, but how to sell them and the existent business benefits behind these improvements in working practices.

    Takeaways from QCon London included:

    @fotuzlab: edifice software is not relish edifice a house, it’s relish town planning #qconlondon

    @_angelos: Observing #qconlondon, I procure the emotion much of software engineering is about automating what exists, not inventing what isn’t there.

    @Helenislovely: This entire conference is relish an index of things I don't know but should. superb coz I relish learning but too overwhelming! #qconlondon

    @Yann_G: How to sustain running the romance w. Agile in a team? Fresh air comes from the outside! dispatch teams to conferences! #qconlondon

    @solsila: Main #qconlondon themes this year? Culture, Microservices, DevOps, Docker... and cats.

    @rolios: Firebase, microservices at The guardian and at Soundcloud, protocols, rxjava on Android, Aeron. terminal day at #qconlondon was huge. The end!

    @bencochez: Almost home after a week at #qconlondon. A truly inspiring experience.

    @portiatung: @rkasper #qconlondon Thanks for the worthy facilitation of the open spaces!

    The ninth annual QCon London brought together over 1,100 attendees - including more than 100 speakers – who are disseminating innovation in software evolution projects across the enterprise. QCon's focus on practitioner-driven content is reflected in the fact that the program committee that selects the talks and speakers is itself comprised of technical practitioners from the software evolution community.

    As well as being notable for its size this QCon represented another milestone. InfoQ.com & Trifork occupy brought you QCon London in partnership since 2005. Now InfoQ is acquiring Trifork's interest in QCon London. Trifork runs GOTO conference in Chicago, Amsterdam, Copenhagen, Berlin, as well as Scala Days & FlowCon. Going forward, London will host two separately rush conferences, reflecting the two companies’ different visions for how to rush developer conferences:

  • QCon London: 3 days conf, 2 days tutorial - March 7-11 2016 - 1,200 attendees. rush by InfoQ.com who runs QCon San Francisco, New York, Sao Paolo, Rio, Beijing, Shanghai, Tokyo.
  • GOTO London: 2 days conf, 2 days tutorial - September 14-17 2015 - 450 attendees. rush by Trifork, who runs GOTO Aarhus, Amsterdam, Chicago, Berlin, Copenhagen, FlowCon, Scala days.
  • The two companies remain friends and Trifork maintains an equity stake in InfoQ's operating company C4Media Inc. The two conferences will cooperate and co-promote each other for the next few years.

    The next English language QCon is New York starting on June 8th, followed by San Francisco on November 16th. QCon London will recrudesce on 7-11 March 2016.


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