[SPARK-15355] [CORE] Proactive block replication#14412

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shubhamchopra wants to merge 6 commits intoapache:masterfrom

shubhamchopra:ProactiveBlockReplication

Commits on Nov 2, 2016

Pro-actively replenishing blocks from failed executors.
shubhamchopra
committed

Commits on Feb 2, 2017

Incorporating feedback from @sameeragarwal
shubhamchopra
committed

Commits on Feb 17, 2017

Commits on Feb 23, 2017

Adding assertion checks to test if all the read locks are released.
shubhamchopra
committed

Commits on Feb 24, 2017

Adding delay to give enough time for replication and release of read locks.
shubhamchopra
committed