CRDT 101

Transcript

1. CRDT 101 Архипов Сергей @9seconds 10.12.2014
2. Наши проблемы ← CRDT ― Network ― RAM ― Persistent storage ― CPU
3. 90е ← CRDT Web Server Application Database
4. 90е ← CRDT Web Server Application Database
5. 2000: Load Balancing ← CRDT
6. 2000: Load Balancing ← CRDT
7. 2002: Replication ← CRDT
8. 2004: Caching ← CRDT
9. 2004: Caching ← CRDT
10. 2006: Web 2.0 + Amazon = Sharding ← CRDT
11. 2008: NoSQL ← CRDT
12. 2010: MapReduce ← CRDT
13. 2000: CAP ← CRDT ― Consistency ― Availability ― Partition Tolerance
14. 2009: CRDT ← CRDT
15. 2009: CRDT ← CRDT
16. 2009: CRDT ← CRDT
17. 2009: CRDT ← CRDT
18. 2009: CRDT ← CRDT
19. 2009: CRDT ← CRDT
20. 2009: CRDT ← CRDT CmRDT — Commutative Replicated Data Type Assuming causal delivery of updates and method termination, any op-based object that satisfies the commutativity property for all concurrent updates, and whose delivery precondition is satisfied by causal delivery, is strong eventual consistent.
21. LWW-element-Set ← CRDT
22. LWW-element-Set ← CRDT tweet = { id: "3b6730f1-50c7-4fad-ac47-ba8c2efadfc1", timestamp: 1416757099, user: "9seconds" message: "Test message" } def tweet_to_lww(tweet): return tweet["timestamp"], tweet
23. LWW-element-Set ← CRDT A R A R
24. LWW-element-Set ← CRDT A R A R (t1, a)
25. LWW-element-Set ← CRDT A R A R (t1, a) (t1, a)
26. LWW-element-Set ← CRDT A R A R (t2, b) (t1, a) (t1, a)
27. LWW-element-Set ← CRDT A R A R (t1, a) (t1, a) (t2, b)
28. LWW-element-Set ← CRDT A R A R (t3, c) (t1, a) (t1, a) (t2, b)
29. LWW-element-Set ← CRDT A R A R (t1, a) (t1, a) (t2, b) (t3, c) (t2, b) (t2, b) (t4, c)
30. LWW-element-Set ← CRDT A R A R (t1, a) (t1, a) (t2, b) (t3, c) (t2, b) (t2, b) (t4, c) (t4, c)
31. LWW-element-Set ← CRDT A R A R (t1, a) (t1, a) (t2, b) (t3, c) (t2, b) (t2, b) (t4, c) (t4, c) Synchronizer (SoundCloud Roshi)
32. LWW-element-Set ← CRDT A R (t1, a) (t1, a) (t3, c) (t2, b) (t2, b) (t4, c) (t4, c)
33. LWW-element-Set ← CRDT A R (t1, a) (t3, c) (t2, b) (t4, c)
34. LWW-element-Set ← CRDT (t1, a) (t2, b)
35. LWW-element-Set ← CRDT A R A R (t1, a) (t1, a) (t2, b) (t3, c) (t2, b) (t4, c) (t4, c) Synchronizer (SoundCloud Roshi) (t3, c)
36. Many CRDTs! ← CRDT ― Op-based Counter ― G-Counter ― State-based PN Counter ― LWW-Register ― MV-Register ― G-Set ― 2P-Set ― LWW-element-Set ― PN-Set ― OR Set ― Add-only monotonic DAG ― Add-Remove Partial Order data type ― RGA ― RHA ― TreeDoc ― Logoot ― WOOT ― WOOTH
37. (Not) Many implementations ← CRDT ― Apache Cassandra ― Apache HBase ― Basho Riak ― SoundCloud Roshi ― Akka CRDT
38. Q/A ← CRDT @9seconds    https://speakerdeck.com/9seconds/crdt-101