Shuffle consolidation#669

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jason-dai wants to merge 8 commits intomesos:masterfrom

jason-dai:shuffle-consolidation-take2

Commits on Jul 2, 2013

shuffle consolidation
jason-dai
committed

Commits on Jul 3, 2013

Add necessary comments for ShuffleBlockManager
jason-dai
committed

Commits on Jul 4, 2013

Break large segment into smaller ones
jason-dai
committed

Commits on Jul 12, 2013

Fix local mode execution and concurrency issues
jason-dai
committed

Commits on Jul 22, 2013

Commits on Jul 23, 2013

Fix MapOutputTrackerSuite failures
jason-dai
committed

Commits on Jul 25, 2013

Fix a bug in MapOutputTracker
jason-dai
committed