[SPARK-4772] Clear local copies of accumulators as soon as we're done with them#3570

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nkronenfeld wants to merge 4 commits intoapache:masterfrom

nkronenfeld:Accumulator-Improvements

Commits on Dec 3, 2014

Clear local copies of accumulators as soon as we're done with them
Nathan Kronenfeld
committed

Commits on Dec 5, 2014

Fuller refactoring as intended, incorporating JR's suggestions for ThreadLocal localAccums, and keeping clear(), but also calling it in tasks' finally block, rather than just at the beginning of th…
Nathan Kronenfeld
committed
Include MiMa exclude as per build error instructions - this version incompatibility should be irrelevent, as it will only surface if a master is talking to a worker running a different version of s…
Nathan Kronenfeld
committed

Commits on Dec 10, 2014

Change Accumulators to private[spark] instead of adding mima exclude to get around false positive in mima tests
Nathan Kronenfeld
committed