svn merge -c 1452384 FIXES: HDFS-4128. 2NN gets stuck in inconsistent state if edit log replay fails in the middle (kihwal via daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452388 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1452435 FIXES: HDFS-4532. RPC call queue may fill due to current user lookup (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452438 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1452372 FIXES: MAPREDUCE-5043. Fetch failure processing can cause AM event queue to backup and eventually OOM (Jason Lowe via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452451 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4541. Merge 1452461 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452463 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1452475 FIXES: YARN-448. Remove unnecessary hflush from log aggregation (Kihwal Lee via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452477 13f79535-47bb-0310-9956-ffa450edef68