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This page documents the goals and results for a series of milestones for the first implementation of RAMCloud. Each milestone last 2 weeks, ending on a Monday.

Milestone 6: ends May 3, 2010

  • Ryan:
    • ...
  • Steve:
    • ...
  • Aravind:
    • ...
  • Diego:
    • Poster (est: 3 days)
    • Unit tests and docs for TCP transport (est: 2 days)
    • ZooKeeper measurements: latency/bandwidth of get/set (est: 1 day)

Milestone 5: ends April 19, 2010

  • Ryan:
    • Mostly working on other projects
    • Flesh out design of index recovery with partitions (est: 1 day)
  • Steve:
    • Working on other projects
  • Aravind:
    • Full task list for TCP-based RPC (est: 1 day)
    • Other RPC tasks TBD
    • Resolve ProtocolBuffer performance disconnect (est: 1 day)
  • Diego:
    • TCP transport for RPC (est: 3 days) (actual: not done, 2.5 days)
    • Get ZooKeeper installed and running (est: 1 day) (actual: done, 0.5 day)
    • ZooKeeper measurements: latency/bandwidth of get/set (est: 1 day) (actual: not started)

Milestone 4: ends March 29, 2010

  • Ryan:
    • Slides for review
  • Steve:
    • Slides for review
  • Aravind:
    • Slides for review
    • RPC refactoring (no estimate)
  • Diego:
    • Slides for review

Milestone 3: ends March 15, 2010

  • Aravind:
    • Implement RPC API on TCP (est: 3 days) (actual: done, 2 days)
    • Finish Protocol Buffer analysis (est: 2 days) (actual: "done", 1.5 days)
    • Deallocate Buffer memory (est: 2 days) (actual: not done)
    • Extra stuff: reworked Buffer class after code review
  • Diego:
    • RAM-33: Least-usable file system: small file ops (est: 2 days) (actual: done, 0.5 day)
    • RAM-51: RAMCloud build attempt with TCP and post-mortem analysis (est: 1 day) (actual: done, except unit test binary too large to fit, 0.5 day)
    • RAM-50: File-by-file opt in/out of "extra checks", add to pre-commit hooks (est: 2 days) (actual: done, 1 day)
    • RAM-41: Hash table cleanup/code review (est: 2 days) (actual: done, 3 days)
  • Ryan:
    • Multi-host backup (est: 1 day) (actual: not done, 0.5 day)
    • Save and collect segement location info for restore (est: 2 days) (actual: not done)
    • RPC design (actual: done, 0.5 day)
  • Steve:
    • Log/Segment refactoring (est: 2 days) (actual: not done)
    • Other code review issues (est: 2 days) (actual: not done)
    • Threading design (actual: done, 1 day)

Milestone 2: ends March 1, 2010

  • Aravind:
    • Analyze protocol buffer performance (est: 0.5 day) (actual: not done, 0.5 day)
    • Implement new RPC API on TCP (est: 4 days) (actual: 70% done?, 3 days)
    • Code review of RCBUF (est: 0.5 day) (actual: done, 3 days)
    • Quick and dirty user-level implementation of scatter-gather (est: 1 day) (actual: done, but not with Buffer, 1 day)
  • Diego (modified 2010-02-18 with John's approval, and somewhat changed my mind 2010-02-19):
    • RAM-36: Finish mini-transactions (est: 1 day)s (actual: done, 0.5 day)
    • RAM-33: Least usable version of file system (est: 5 days) (actual: not done (only directories so far), 4 days)
    • RAM-26: Table enumeration (est: 2 days) or maybe instead RAM-38: C/C++ extension for Python bindings (est: 2 days) (actual: not started)
  • Ryan:
    • Propagate GetSegMetaData through server (est: 0.5 day) (actual: done, 0.5 day)
    • Boilerplate recovery routine (est: 0.5 day) (actual: in flux because of segment refactor, 1 day)
    • Creating shadow objects in log (est: 2 days) (actual: not done, depends on segment refactor)
  • Steve:
    • Log/tombstone tests (est: 1 day) (actual: done, 2 days)
    • Design for multi-threading (est: 2 days) (actual: not done, 1 day so far)

Milestone 1: ends February 15, 2010

  • Aravind:
    • RCBuf implementation (including docs and tests) (est: 3 days) (actual: done in 4 days, ~10 hours)
    • Use RCBufs in current RPC mechanism (est: 1 day) (actual: done in 2 half-days)
    • New RPC API implemented on TCP (est: 4 days) (actual: not done)
    • Extras: protocol buffer tests
  • Diego:
    • Mini-transactions returning Booleans (est: 3 of "7") (actual: not done (90%?) spent "5")
    • Mini-transactions returning results/error info (est: 4 of "7") (actual: not done (90%?), spent "2")
    • Extras: transaction discussions, functional tests
  • Ryan:
    • Finish GetSegMetaData (est: 2 days) (actual: done in 16 actual hours)
    • Support multiple segments in backup (est: 3 days) (actual: not done)
    • Support multiple backups/master (est: 3 days) (actual: not done)
    • Extras: cleanup (4 hours)
  • Steve:
    • New tombstone code (est: 1 day) (actual: done in 4 hours)
    • Log/tombstone docs (est: 1 day) (actual: done in 2 hours)
    • Log/tombstone tests (est: 3 days) (actual: not done; halfway?)
    • Segment docs (est: 1 day) (actual: done in 1 hour)
    • Segment tests (est: 1 day) (actual: done in 2-3 hours)
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