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Moneytree - Data Aggregation with SWF
- 1. Ross Sharrott Founder / CTO rsharrott@moneytree.jp @moneytreejp
- 2. Who Am I? Ross Sharrott Founder & CTO of Moneytree American 10 Years in Japan (Feb 24!) Previously Senior IT Manager Love distributed architectures in the cloud
- 3. What is Moneytree? Internet banking is fragmented; not simple
- 4. Email is Simple Gmail Yahoo! Work, etc. For mail we use just ONE app!
- 5. Radically simplify your relationship with money
- 6. and make it beautiful.
- 7. Data Aggregator Our Goals: Download accounts for 1M people every day Deliver new data in < 1 minute 2-3 developers Sleep at night
- 8. First Idea I know…I’ll use a queue!
- 9. Original Queue Based Process Download Data Process Statements Store Data
- 10. 1 Account / Many Statements But we had a problem… To determine a CC balance, we need information from multiple statements We needed a post statement process Download Data Process Statements Post Process Statements Store Data + Additional Information
- 11. What We Needed Download Data Process Statements • Statement 1 • Statement 2 • Many More Post Process
- 12. Queue Falls Down I know…I’ll use a queue! Queues are linear Where are we in the process? Logged in yet? Processing data? What do you do when a job fails? How do you relate jobs to one workflow?
- 13. Enter SWF AWS Managed Service Coordinates Workflows / Maintains history Provides multiple queues called Task Lists Handle decision points with Deciders Perform tasks with Activity Workers
- 14. Real World – A Restaurant
- 15. SWF World – A Restaurant Decider – does nothing, makes decisions Workflow Starter – takes orders Activity Worker – makes food Activity Worker – distributes food SWF – maintains history, distributes tasks
- 16. Activity Worker Very similar to any queue worker Handles a specific task Polls a Task List to get new info Reports activity success or failure Puts results in a DB or on S3, etc.
- 17. Workflow Decider Uses workflow history to make decisions Schedules tasks Handles rescheduling failures & timeouts Reacts to external events (Signals) Reacts to completion events
- 20. 1 Day of Work Yesterday: 70,000 Workflows Average Completion Time: 1 Minute 575,000 Decision Tasks 146,000 Statements Processed 70,000 Aggregation Tasks 70,000 Post Process Tasks
- 21. Data Aggregator Our Goals: 1M people every day Deliver new data in < 1 minute 2-3 developers Sleep at night
- 22. How To Sleep At Night Make Workers Scalable Avoid SWF API Throttling Expect Failures Measure Everything
- 23. Make Workers Scalable Separate concerns into individual workers Scale each worker process individually Automate scaling your workers Make workers idempotent You can always try again
- 24. Avoid API Throttling Don’t call GetWorkflowHistory Stress test your implementation Limits are by Region, not domain! Get your limits raised We hit limits on day 1 Use exponential retry Have a circuit breaker
- 25. Expect Failures Cloud = Failures Dyno / EC2 instance restarts Network & Service outages Don’t wait for failed processes Use aggressive timeouts Use heartbeats for long processes
- 26. Monitor Everything Use Performance Monitoring 10x increase in performance = 10x workers New Relic & Cloudwatch Centralize Logging Cloud resources disappear w/their logs Papertrail / Logentries Log Everything & Setup Alerts If you don’t log it, you can’t fix it
- 27. Sleep At Night Make Workers Scalable Avoid SWF API Throttling Expect Failures Measure Everything
- 28. Thank You! Moneytree is hiring! iOS Developers API Developers / AWS Dev Ops Technology Ninjas Ross Sharrott Founder / CTO rsharrott@moneytree.jp @moneytreejp
Editor's Notes
- Manager – does nothing, makes decisionsWaitress – takes ordersCook – makes foodHall Staff – delivers foodPOS System – maintains history, distributes tasks
- Long Poll SWF for new decisions. Monitors a single decision task list.
- Top Level is simpleBut…We can fail to login or need additional informationWe can fail to process a statement
- Decider to handle the WorkflowData Aggregation Activity WorkerStatement Processing Activity WorkerPost Processing Activity WorkerShare Data via S3