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Antifragile, Microservices and DevOps - A Study

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A Study of Antifragile System and Organization, Microservices Architecture, and DevOps Movement.

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Antifragile, Microservices and DevOps - A Study

  1. 1. Anti-fragility, Microservices & DevOps - A Study By William
  2. 2. Agenda • The Principle of Anti-fragility • Microservices Architecture • The Principle of DevOps
  3. 3. Topic: What’s the Antonym of Fragile? • Robust? • Anti-fragile
  4. 4. Fragile Shatters when exposed to even a small stressor.
  5. 5. Robust
  6. 6. The Problem of Robust • Robust is just Fragile with a thicker skin… • Encourages a defensive, static mindset • Resistant to change? • Vulnerable to “Black Swan” events… – Something we haven’t anticipated – A failure mode we can’t have foreseen – A cascade of errors that we did not plan for
  7. 7. Black Swans
  8. 8. Anti-fragile When exposed to stress it gets stronger
  9. 9. Anti-fragile Some things benefit from shocks…volatility, randomness, disorder, and stressors and love adventure, risk, and uncertainty… there is no word for the exact opposite of fragile. Let’s call it antifragile. Nassim N. Taleb, “Antifragile. Things that gain from disorder”
  10. 10. Triple Prism of Fragile, Robust & Anti- fragile
  11. 11. Fragile Robust Anti-Fragile Icon Glass Medieval Castle DNA/Muscle Methodology “Spaghetti” ITIL DevOps Attitude to change Fear Change Resist Change Embrace Change Response to Change Break Repel Adapt Rate of Change Ideally never! Slow Rapid Change initiated by Needs CEO approval Change Management Board User- initiated(via automation) Focuses on Survival Process Business Value http://blog.devopsguys.com/2013/07/17/devops-antifragility-and-the- borg-collective/
  12. 12. Is the System in Your Company • Fragile? • Robust?? • Anti-fragile???
  13. 13. Anti-fragile Microservices Architecture
  14. 14. Microservices Architecture – A Case in Practice
  15. 15. Service Dependency
  16. 16. Single Dependency Delay Causing Blocking of User Request
  17. 17. All User Requests will be Blocked at Peak Hour(Cascading Failure)
  18. 18. Circuit Breaker & Bulkhead Isolation Pattern https://github.com/Netflix/Hystrix
  19. 19. Cross IDC Active - Active GLSB DC Aware Gateway SOA Edge Service Service Registry Peer Sync Invoke Invoke Invoke Invoke DC 1 DC 2 SOA Middle Tier Service DC Aware Gateway SOA Edge Service SOA Middle Tier Service Service RegistryDC Aware Client DC Aware Client Invoke Invoke Invoke Lookup Lookup Register Register Lookup Lookup RegisterRegister
  20. 20. Anti-fragile Continuous Integration/Delivery Pattern … to exert a constant stress on your delivery and deployment process to reduce its fragility so that releasing becomes a boring, low-risk activity. Jez Humble, “On Antifragility in Systems and Organizational Structure” http://continuousdelivery.com/2013/01/on- antifragility-in-systems-and-organizational- architecture/
  21. 21. Building Distributed System is Extremely Hard • Even Harder to Test Sufficiently – Massive data sets and changing shape – Internet-scale traffic – Complex interaction and information flow – Asynchronous nature – 3rd party services – All while innovating and building features Prohibitively expensive, if not impossible, for most large-scale systems.
  22. 22. There is another Way • Assume everything will fail • Cause failure to validate resiliency • Test design assumption by stressing them • Don’t wait for random failure. Remove its uncertainty by forcing it periodically.
  23. 23. What Netflix has Done – Embrace Chaos! “One of the first systems our engineers built in AWS is called the Chaos Monkey. The Chaos Monkey’s job is to randomly kill instances and services within our architecture. If we aren’t constantly testing our ability to succeed despite failure, then it isn’t likely to work when it matters most – in the event of an unexpected outage.” http://luckyrobot.com/netflix-chaos-monkey-keeps-movies-streaming/ http://www.codinghorror.com/blog/2011/04/working-with-the-chaos- monkey.html
  24. 24. Netflix Simian Army
  25. 25. Representative Anti-fragile Organization The Netflix cloud architecture is anti-fragile… The Netflix culture is anti-fragile… Getting stronger through failure is the basis of anti-fragility. Avoiding failure at all costs… makes you brittle and vulnerable… Adrian Cockroft, “Looking back at 2012 with pointers to 2013” http://perfcap.blogspot.com/2013/12/looking- back-at-2013-with-pointers-to.html
  26. 26. Architecture for Imperfection A highly agile and highly available service constructed from ephemeral and often broken components. It is a service-oriented architecture built on micro-services, none of which are essential to the operation of the whole. The software is written to run across three Amazon datacenters, and will tolerate the loss of any one. We can lose a third of our infrastructure without our customers noticing and calling customer services, it’s no idle claim, Netflix even tests this aspect of its infrastructure. A few weeks ago the team deliberately killed one of the three zones, knocking out 3000 servers in one fell swoop, just to prove that we could do it. By Adrian Cockcroft, from “Netflix, HANA and the meaning of cloud” http://diginomica.com/2013/05/13/netflix-hana-and-the-meaning-of- cloud/
  27. 27. Netflix Global Active – Active Cloud Architecture http://awsmedia.s3.amazonaws.com/ARC305.pdf
  28. 28. What on Earth is DevOps Devops means giving a sh*t about your job enough to not pass the buck. Devops means giving a sh*t about your job enough to want to learn all the parts and not just your little world. Developers need to understand infrastructure. Operations people need to understand code. - John E. Vincent(@Lusis) http://blog.lusis.org/blog/2013/06/04/devops-the-title- match/
  29. 29. “3 Ways” of DevOps http://itrevolution.com/the-three-ways- principles-underpinning-devops/
  30. 30. The First Way Silo vs. System Thinking, focus on the end to end value flow.
  31. 31. The Second Way System improvement via visibility, feedback and data driven decisions
  32. 32. The Third Way Embrace Change Be willing to Experiment Learn from your mistakes
  33. 33. Microservices Organizational Structure
  34. 34. Take Away 1. Obsessive protection of system against extremely rare events makes it more fragile. 2. Monoculture is fragile, diversity is anti-fragile. 3. If it hurts, do it more often, and bring the pain forward. 4. To create anti-fragile system, stress to them continuously so we are forced to simplify and automate.
  35. 35. Reading for System and Architectural Thinking – recommended by Adrian Cockroft

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