TEZ-1345. Add checks to guarantee all init events are written to recovery to consider vertex initialized. (Jeff Zhang via hitesh)
Revert due to build failure. "TEZ-1345. Add checks to guarantee all init events are written to recovery to consider vertex initialized. (Jeff Zhang via hitesh)"

This reverts commit 2bdac27495f6899b766e537576e7edf6df53c7a3.
TEZ-850. Recovery unit tests. (Jeff Zhang via hitesh)
Revert "TEZ-1494. DAG hangs waiting for ShuffleManager.getNextInput() (Rajesh Balamohan)"

This reverts commit de008b54a208881321d15addfe35b8094720be25.
TEZ-1543. Shuffle Errors on heavy load (causing task retries)  (Rajesh Balamohan)
TEZ-1494. DAG hangs waiting for ShuffleManager.getNextInput() (Rajesh Balamohan)