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)
TEZ-853. Support counters recovery. (Jeff Zhang via hitesh)
TEZ-1345. Add checks to guarantee all init events are written to recovery to consider vertex initialized. (Jeff Zhang via hitesh)
TEZ-1539. Change InputInitializerEvent semantics to
SEND_ONCE_ON_TASK_SUCCESS. (sseth)
Fix accidental change to CHANGES.txt
TEZ-1574. Support additional formats for the tez deployed archive.
(sseth)
TEZ-1575. MRRSleepJob does not pick MR settings for container size and java opts. (hitesh)
TEZ-1578. Remove TeraSort from Tez codebase. (hitesh)
TEZ-1569. Add tests for preemption (bikas)
TEZ-1580. Change TestOrderedWordCount to optionally use MR configs. (hitesh)
TEZ-1524. Resolve user group information only if ACLs are enabled (gopalv)
TEZ-1581. GroupByOrderByMRRTest no longer functional. (hitesh)
TEZ-1563. TezClient.submitDAGSession alters DAG local resources regardless of DAG submission (bikas)
TEZ-1571. Add create method for DataSinkDescriptor. Contributed by Jeff
Zhang.
TEZ-1585. Memory leak in tez session mode (Rajesh Balamohan)
Update CHANGES.txt related to TEZ-1585
TEZ-1533. Request Events more often if a complete set of events is
received by a task. (sseth)