apache/spark — pull request #2240 by rxin (2014-09-02 22:26:00+00:00)
Title: [SPARK-3019] Pluggable block transfer interface (BlockTransferService)

This pull request creates a new BlockTransferService interface for block fetch/upload.

The pull request also refactors the existing ConnectionManager to implement BlockTransferService (CMBlockTransferService).

TODOs that should be part of this PR:
- [ ] Bring this up to date with master
- [ ] Look at the removed unit tests and see if they still make sense to be added back

TODOs that should be separate PRs:
- [ ] Implement NettyBlockTransferService