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Apache Samza * Stream Processing at LinkedIn

Apache Samza * Stream Processing at LinkedIn. Chris Riccomini 11/13/2013. * Incubating. Stream Processing?. 0 ms. Response latency. RPC. 0 ms. Response latency. Synchronous. RPC. 0 ms. Response latency. Later. Possibly much later. Synchronous. Samza. RPC. 0 ms.

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Apache Samza * Stream Processing at LinkedIn

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  1. Apache Samza*Stream Processing at LinkedIn Chris Riccomini 11/13/2013 * Incubating

  2. Stream Processing?

  3. 0 ms Response latency

  4. RPC 0 ms Response latency Synchronous

  5. RPC 0 ms Response latency Later. Possibly much later. Synchronous

  6. Samza RPC 0 ms Response latency Milliseconds to minutes Later. Possibly much later. Synchronous

  7. Newsfeed

  8. News

  9. Ad Relevance

  10. Email

  11. Search Indexing Pipeline

  12. Metrics and Monitoring

  13. Motivation

  14. Real-time Feeds • User activity • Metrics • Monitoring • Database Changes

  15. Real-time Feeds • 10+ billion writes per day • 172,000 messages per second (average) • 55+ billion messages per day to real-time consumers

  16. Stream Processing is Hard • Partitioning • State • Re-processing • Failure semantics • Joins to services or database • Non-determinism

  17. Samza Concepts & Architecture

  18. Streams Partition 0 Partition 1 Partition 2

  19. Streams Partition 0 Partition 1 Partition 2 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5

  20. Streams Partition 0 Partition 1 Partition 2 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5

  21. Streams Partition 0 Partition 1 Partition 2 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5

  22. Streams Partition 0 Partition 1 Partition 2 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5

  23. Streams Partition 0 Partition 1 Partition 2 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5

  24. Streams Partition 0 Partition 1 Partition 2 1 2 3 4 5 6 7 1 2 3 4 5 6 1 2 3 4 5 next append

  25. Tasks Partition 0

  26. Tasks Partition 0 Task 1

  27. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  28. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  29. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  30. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  31. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  32. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  33. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  34. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  35. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  36. Tasks Partition 0 class PageKeyViewsCounterTask implements StreamTask{ public void process(IncomingMessageEnvelope envelope, MessageCollector collector, TaskCoordinator coordinator) { GenericRecordrecord = ((GenericRecord) envelope.getMsg()); String pageKey = record.get("page-key").toString(); intnewCount = pageKeyViews.get(pageKey).incrementAndGet(); collector.send(countStream, pageKey, newCount); } }

  37. Tasks Partition 0 Task 1

  38. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 0 Partition 1

  39. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 0 Partition 1

  40. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 0 Partition 1

  41. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 0 Partition 1

  42. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 0 Partition 1

  43. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 0 Partition 1

  44. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 1 Partition 0

  45. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask Output Count Stream Partition 1 Partition 0

  46. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask 2 Checkpoint Stream Output Count Stream Partition 1 Partition 1 Partition 0

  47. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask 2 Checkpoint Stream Output Count Stream Partition 1 Partition 1 Partition 0

  48. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask 2 Checkpoint Stream Output Count Stream Partition 1 Partition 1 Partition 0

  49. Tasks Page Views - Partition 0 1 2 3 4 PageKeyViews CounterTask 2 Checkpoint Stream Output Count Stream Partition 1 Partition 0 Partition 1

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