Reliability Engineering for Enterprise Serverless
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日本語が消えてしまっています。。。完全版はSpeakerDeckの方に上げました↓ https://speakerdeck.com/marcyterui/reliability-engineering-for-enterprise-serverless
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Reliability Engineering for Enterprise Serverless
- 1. RELIABILITY ENGINEERING FOR ENTERPRISE SERVERLESS MASASHI TERUI @ JAWS DAYS 2018
- 2. SERVERWORKS CO.,LTD. + FREELANCER • Serverless Oji-san • Serverless Framework Plugin Developer • Serverlessconf Tokyo 2016/2017 speaker • Remote worker (in Sapporo) • The best Cloud Engineer in Hokkaido!! (でありたい） MASASHI TERUI ARCHITECT / DEVELOPER
- 3. AGENDA SERVERLESS ってなんだっけ？ 1 6 2 7 3 8 4 9 5 10 SERVERLESS の信頼性とは？ SERVERLESS のよくある課題 SERVERLESS を実体を捉える RELIABILITY 考え方 RELIABILITY 設計編 RELIABILITY 実装編 RELIABILITY 監視編 SUMMARY 世界を広げる SERVERLESS は特別じゃない
- 5. CNCF SERVERLESS WHITEPAPER V1.0 • Serverless computing refers to the concept of building and running applications that do not require server management • A platform may provide one or both of the following: • Functions-as-a-Service (FaaS) • Backend-as-a-Service (BaaS) • Products or platforms deliver the following benefits to developers: • Zero Server Ops • No Compute Cost When Idle https://github.com/cncf/wg-serverless/tree/master/whitepaper
- 6. SERVERLESS IS NOT GLUE IN ENTERPRISE APPLICATION ”THE ORCHESTRATOR MANAGES THE TRADES USING A GRAPH OF STATES”
- 7. SERVERLESS CLOUD NATIVE LANDSCAPE
- 8. BUT I PREFER THIS ONE https://www.slideshare.net/acloudguru/ant-stanley-being-serverless
- 9. SERVERLESS USE CASES (FROM CNCF WP) • Asynchronous, concurrent, easy to parallelize into independent units of work • Infrequent or has sporadic demand, with large, unpredictable variance in scaling requirements • Stateless, ephemeral, without a major need for instantaneous cold start time • Highly dynamic in terms of changing business requirements that drive a need for accelerated developer velocity • Non-HTTP-centric and non-elastic scale workloads that weren’t good fits for an IaaS, PaaS, or CaaS solution (Event Driven workloads)
- 10. “There are many workloads that are stateful and/or not easy to parallelize” と思ってませんか？ “Asynchronous and Event Driven processing is too difficult for humans”
- 12. RELIABILITY(RASIS) 細分化すると色々ある • Reliability • Availability • Serviceability • Integrity • Security ここでは以下のように定義 「Reliability = 広義の信頼性(RASIS)」 Reliability Availability Serviceability Integrity Security Reliability
- 13. IS SERVERLESS DIFFICULT TO GUARANTEE THE RELIABILITY? • Strongly depends on FaaS platform and BaaS products • Lose the business continuity (Reliability, Availability) • Distributed Instances • Lose the traceability (Serviceability) • Hard to develop • All become functions (Serviceability) • NoSQL matches better than RDB (Integrity)
- 14. SERVERLESSのよくある課題 i s s u e s
- 15. FaaSのよくある課題 • How to test the functions? • Granularity of the functions • Messaging between the functions and backends • Handling request and response (Error Handling) • Log Aggregation, Traceability • Monitoring
- 16. BaaSのよくある課題 • How to choose the services? • Fault Tolerance • Monitoring
- 18. MECANISM OF FAAS
- 20. THE INTERNAL FLOW OF PROCESSINGhttps://github.com/apache/incubator-openwhisk/blob/master/docs/about.md#the-internal-flow-of-processing イベント(HTTP)が処理される流れを掴む ストリームやキューを挟んで分散処理するのが基本 外から見て同期でも中は非同期かつ分散
- 21. THE FUNCTIONS THAT INVOKED ASYNCHRONOUS IN THE CONTAINERS FaaS is… コンテナ内で非同期に呼び出される関数
- 22. WHAT IS BAAS?
- 23. FROM OWNERSHIP TO USE SERVICES クラウドによってサーバが所有から利用へ さらにミドルウェアやライブラリも利用へ BaaSを使うのはそういう自然な流れ
- 24. FULLY MANAGED AND ABSTRACTED MIDDLEWARES AND LIBRARIES BaaS is… フルマネージドかつ抽象化されたMWやライブラリ
- 26. CONSTITUTED OF THE ABSTRACTED FUNCTIONS AND MIDDLEWARES Serverless is… 抽象化されてるだけで関数とMWでできてる
- 27. WE CAN MAKE RELIABLE SERVERLESS APPLICATION SO… 信頼性は作れる！
- 29. RELIABILITYの考え方 • Make the reliability by myself • Serverless will help you, but will not protect your business • Think simple • Apply generally development/operation practices • If you can't apply the practices, take care of the serverless mechanism • Keep simple • Don't be afraid that increase the number of the functions • We should be afraid complicated architecture • Change your mind as a software • Everything is part of your application
- 31. ALL EVENTS FLOWS IN THE SAME DIRECTION イベント(データ)は同じ方向に流す 結果が必要なら同期で返さず 取りに行かせる 🙅 🙆
- 32. ALL EVENTS FLOWS IN THE SAME DIRECTION • They will be naturally Asynchronous and Functional • Asynchronous processing is Retriable • Functional processing is Reproducible • The clients get the results by myself • However, polling is not good choise... • Pushing is better choice • Can we be happy with AppSync? (Pushing via Websocket)
- 33. UNIFY THE ENDPOINTS BETWEEN THE SERVICES サービス間のエンドポイントは集約する ラップして集約しコントロールを得る
- 34. UNIFY THE ENDPOINTS BETWEEN THE SERVICES • Microservices • Separate the services by the domains (One BaaS is one of your service) • The endpoint of the service is not unique, it has the endpoints for each operations • Wrap the endpoints to abstract them • Like a “MySQL Server” and “libmysql” • Do you call “libmysql” directly? • You can make Failover/Failsafe mechanism • Like a Reverse Proxy • Do you connect to multiple “Read replicas” from “each app servers”? • Trafic controlling, Caching
- 35. ALL SERIES OF EVENTS HAVE THE SAME ID 一連の処理には同じIDを付与 それを引き回すことでIDでトレースできる このIDは様々な制御にも使える
- 36. ALL SERIES OF EVENTS HAVE THE SAME ID • Log Aggregation • A series of events can be traced by the ID • Monitor the progress • Log all event messages • Execution control • At least once -> Exactly once • e.g. DynamoDB Conditional Writes • Make it easy to implement with something like a decorator
- 37. DATA MODELING • Become the friend with DynamoDB • Distributed by Partition Key and Indexed(B-tree) by Sort Key, LSI • GSI is a projection of sorted(indexed) data • The consistency can be guaranteed without ACID transaction • Denormalization • Strong consistency reading, Conditional Writing • There are some difficult situation • Write asynchronous to RDB
- 39. GRANULARITY OF THE FUNCTIONS •Testable!! • Unit testing is justice in the serverless world • Make the dependencies of other services are replaceable • Would be replaceable to the mocks • Easy to Failover/Failsafe
- 40. HOW TO TEST THE FUNCTIONS • Unit testing is justice in the serverless world (2回目) • Deploy a new environment if the mocks are not enough at integration testing • It is easy with some frameworks (e.g. Serverless, SAM) • The services outside of AWS are needed to be easily to deploy (via API) • Continuous E2E testing with traceable ID • It become a monitoring
- 42. RELIABILITY MONITORING • The greatest monitoring is the notifications from the application • Be sure to catch the errors and notify them • Collect the metrics of the services • CloudWatch • This is a condition to choice the services outside of AWS • Continuous E2E testing with traceable ID
- 43. SUMMARY
- 44. “SERVERLESS IS NOT SPECIAL” THANKS!! “MAKE THE RELIABILITY BY MYSELF” “THINK SIMPLE, KEEP SIMPLE” “EVERYTHING IS PART OF YOUR APPLICATION” “LET'S EXPAND SERVERLESS WORLD”
- 45. bit.ly/jd2018-sls #jawsdays #jd2018_a PLEASE TAKE A SURVEY