Lock Service with Paxos in Erlang
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Overview of my implementation of a wannabe highly available lock service over Paxos algorithm in Erlang
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Lock Service with Paxos in Erlang
- 1. Motivation Implementation Evaluation Conclusions . . . Lock Service with Paxos .. . . Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Supervisor: Johan Montelius C CC BY: EMDC KTH December 5, 2012 . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 1/19 CC BY:
- 2. Motivation Implementation Evaluation Conclusions . . . Motivation 1 . . . Implementation 2 Architecture Fault Tolerance & Optimizations . . . Evaluation 3 Central Lock Experiments . . . Conclusions 4 . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 2/19 CC BY:
- 3. Motivation Implementation Evaluation Conclusions . Paxos . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 3/19 CC BY:
- 4. Motivation Implementation Evaluation Conclusions . Paxos . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 3/19 CC BY:
- 5. Motivation Implementation Evaluation Conclusions . From Paxos to a Lock Service Not Trivial . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 4/19 CC BY:
- 6. Motivation Implementation Evaluation Conclusions . From Paxos to a Lock Service Not Trivial Paxos Replicated State Machine . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 4/19 CC BY:
- 7. Motivation Implementation Evaluation Conclusions . From Paxos to a Lock Service Not Trivial Paxos Replicated State Machine Slot queue → Sequence of lock holders . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 4/19 CC BY:
- 8. Motivation Implementation Evaluation Conclusions . From Paxos to a Lock Service Not Trivial Paxos Replicated State Machine Slot queue → Sequence of lock holders Paxos round number = Slot number . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 4/19 CC BY:
- 9. Motivation Implementation Evaluation Conclusions . From Paxos to a Lock Service Not Trivial Paxos Replicated State Machine Slot queue → Sequence of lock holders Paxos round number = Slot number Paxos decides who gets each slot . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 4/19 CC BY:
- 10. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . . . Motivation 1 . . . Implementation 2 Architecture Fault Tolerance & Optimizations . . . Evaluation 3 Central Lock Experiments . . . Conclusions 4 . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 5/19 CC BY:
- 11. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Abstract View . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 6/19 CC BY:
- 12. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Detailed View . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 7/19 CC BY:
- 13. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 14. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 15. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 16. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 17. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 18. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 19. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 20. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 21. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 22. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Use Case . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 8/19 CC BY:
- 23. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Process Fault Tolerance Supervisor Tree Process restarts aware that it has crashed . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 9/19 CC BY:
- 24. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Paxos Fault Tolerance Acceptor persists asynchronously its state . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 10/19 CC BY:
- 25. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Paxos Fault Tolerance Acceptor persists asynchronously its state Learner persists asynchronously the slot queue . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 10/19 CC BY:
- 26. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Paxos Fault Tolerance Acceptor persists asynchronously its state Learner persists asynchronously the slot queue Assignor persists asynchronously its state . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 10/19 CC BY:
- 27. Motivation Implementation Architecture Evaluation Fault Tolerance & Optimizations Conclusions . Optimizations @COMPLETED: Receiver handles the huge amount of requests Shared Queue between Receiver and Proposer Learner and Acceptor spawn separate writing process . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 11/19 CC BY:
- 28. Motivation Implementation Architecture Evaluation Fault Tolerance Optimizations Conclusions . Optimizations @COMPLETED: Receiver handles the huge amount of requests Shared Queue between Receiver and Proposer Learner and Acceptor spawn separate writing process @TODO: Propose lock requests in batches Leader Garbage Collection . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 11/19 CC BY:
- 29. Motivation Implementation Central Lock Evaluation Experiments Conclusions . . . Motivation 1 . . . Implementation 2 Architecture Fault Tolerance Optimizations . . . Evaluation 3 Central Lock Experiments . . . Conclusions 4 . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 12/19 CC BY:
- 30. Motivation Implementation Central Lock Evaluation Experiments Conclusions . Throughput . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 13/19 CC BY:
- 31. Motivation Implementation Central Lock Evaluation Experiments Conclusions . Latency . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 14/19 CC BY:
- 32. Motivation Implementation Central Lock Evaluation Experiments Conclusions . Cost of Availability # of Paxos Nodes VS Latency and/or Throughput . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 15/19 CC BY:
- 33. Motivation Implementation Central Lock Evaluation Experiments Conclusions . Cost of Availability # of Paxos Nodes VS Latency and/or Throughput Will look like: . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 15/19 CC BY:
- 34. Motivation Implementation Central Lock Evaluation Experiments Conclusions . Cost of Fault Tolerance Latency of Node Recovery VS Latency and/or Throughput . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 16/19 CC BY:
- 35. Motivation Implementation Central Lock Evaluation Experiments Conclusions . Cost of Fault Tolerance Latency of Node Recovery VS Latency and/or Throughput Will look like: . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 16/19 CC BY:
- 36. Motivation Implementation Central Lock Evaluation Experiments Conclusions . More Proposer Timeouts VS Latency and/or Throughput Paxos +/-Persistence VS Latency and/or Throughput . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 17/19 CC BY:
- 37. Motivation Implementation Evaluation Conclusions . . . Motivation 1 . . . Implementation 2 Architecture Fault Tolerance Optimizations . . . Evaluation 3 Central Lock Experiments . . . Conclusions 4 . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 18/19 CC BY:
- 38. Motivation Implementation Evaluation Conclusions Find golden ratio: Performance vs Availability Find golden ratio: Performance vs Fault Tolerance Their combination? . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 19/19 CC BY:
- 39. Motivation Implementation Evaluation Conclusions Find golden ratio: Performance vs Availability Find golden ratio: Performance vs Fault Tolerance Their combination? Questions ? . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 19/19 CC BY:
- 40. Part I . . Appendix . .. . . . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 20/19 CC BY:
- 41. . Benchmarking Tool Basho bench Ability to write custom clients Can simulate network dispatcher process . . . . . . C Presenter: Emmanouil Dimogerontakis Teammate: Muhammet Orazov Service with Johan Montelius Lock Supervisor: Paxos 1/1 CC BY: