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-0.23@1452440 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-0.23@1452478 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1452548 FIXES: YARN-345. Many InvalidStateTransitonException errors for ApplicationImpl in Node Manager. Contributed by Robert Parker


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1452555 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-0.23' into branch-0.23-gd