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:
  • Working on other projects
• Steve:
  • Working on other projects
• Aravind:
  • Documentation and testing for RPC code (est: 2 days)
  • Integrate properly Buffer into the code - right now Buffer is only used just before sending an RPC. (est: 2 days)
  • Computer forum poster (est: 2 days)
• 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, actual: no time to work)
• Steve:
  • Working on other projects (actual: done!)
• Aravind:
  • Full task list for TCP-based RPC (est: 1 day, actual: done, 1 day)
  • Other RPC tasks TBD
    • Port existing code to Buffer and RPC (est: was TBD, actual: 2 days)
    • Hook up RPC system to use Diego's TCP Transport (est: was TBD; actual: 1 days)
  • Resolve ProtocolBuffer performance disconnect (est: 1 day, actual: done, 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)