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Routing Trillions of Events Per Day @Twitter
- 4. ● ● ● ○ ○ Clients Aggregated by Category Storage HDFS Http Clients Clients Client Daemon Client Daemon Client Daemon Http Endpoint
- 5. Across millions of clients Incoming uncompressed Collocated with HDFS datanodes Event groups by category
- 6. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 7. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 8. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 9. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 10. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 11. Events Events RT Storage (HDFS) Inside DC1 Events Events RT Storage (HDFS) Inside DCN DW Storage (HDFS) Prod Storage (HDFS) DW Storage (HDFS) Cold Storage (HDFS) Prod Storage (HDFS)
- 12. Events Events RT Storage (HDFS) Inside DC1 Events Events RT Storage (HDFS) Inside DCN DW Storage (HDFS) Prod Storage (HDFS) DW Storage (HDFS) Cold Storage (HDFS) Prod Storage (HDFS)
- 14. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 16. ● ○ ● ● ● ●
- 18. ● ● ● Agent 1 Agent 2 Agent 3 Category 1 Category 3Category 2 Category Group
- 19. Group 1 Category Groups Aggregator Group 1 Aggregator Group 2● ● Agent 1 Agent 2 Agent 3 Agent 8 Group 2
- 20. ● ● ● ●
- 21. ● ● ●
- 23. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 24. To process one day of data Output of cleaned, compressed, consolidated, and converted Saved by processing Flume sequence files
- 25. ● ● ● ●
- 26. Datacenter 1 ads_group/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hhlogin_group/yyyy/mm/dd/hh Category Groups CategoriesDemux Jobs ads_group_demuxer login_group_demuxer
- 27. Datacenter 1 ads_group/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hhlogin_group/yyyy/mm/dd/hh Category Groups CategoriesDemux Jobs ads_group_demuxer login_group_demuxer
- 28. Datacenter 1 ads_group/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hhlogin_group/yyyy/mm/dd/hh Category Groups CategoriesDemux Jobs ads_group_demuxer login_group_demuxer
- 30. ● Scribe’s contract amounts to sending a binary blob to a port ● Scribe used new line characters to delimit records in a binary blob batch of records ● Valid records may include newline characters ● Scribe base64 encoded received binary blobs to avoid confusion with record delimiter ● Base 64 encoding is no longer necessary because we have moved to one serialized Thrift object per binary blob
- 34. ● ● ● ● ●
- 35. ● Some categories are significantly larger than other categories (KBs v TBs) ● MapReduce demux? Each reducer handles a single category ● Streaming demux? Each spout or channel handles a single category ● Massive skew in partitioning by category causes long running tasks which slows down job completion time ● Relatively well understood fault tolerance semantics similar to MapReduce, Spark, etc
- 36. ● Tez’s dynamic hash partitioner adjusts partitions at runtime if necessary, allowing large partitions to be further partitioned so multiple tasks process events for a single category one task ○ More info at TEZ-3209. ○ Thanks to team member Ming Ma for the contribution! ● Easier horizontal scaling simultaneously providing more predictable processing times
- 37. Task 3 Task 2 Input File 1 Task 1
- 38. Task 3 Task 2 Input File 1 Task 1 Task 4 Task 5
- 40. Clients Local log collection daemon Clients Aggregate log events grouped by Category Storage (HDFS) HTTP Remote Clients Log Processor Storage (HDFS) Storage (HDFS) Log ReplicatorStorage (HDFS) Inside DataCenter Storage (Streaming)
- 41. Across all analytics clusters Replicated to analytics clusters
- 42. ● ○ ○ ● ● ●
- 43. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 44. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 45. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 46. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 47. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 48. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 49. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 50. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 51. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 52. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 53. Datacenter N Datacenter 1 ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh ads_view/yyyy/mm/dd/hh login_event/yyyy/mm/dd/hh ads_click/yyyy/mm/dd/hh Replication Jobs ads_click_repl ads_view_repl ads_click_repl login_event_repl
- 55. ● ● ● ● ●
- 57. ● ● ● ●