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/trunk@1452372 13f79535-47bb-0310-9956-ffa450edef68
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/trunk@1452384 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4532. RPC call queue may fill due to current user lookup (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1452435 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4541. Set hadoop.log.dir and hadoop.id.str when starting secure datanode to write the logs to right dir by default. Contributed by Arpit Gupta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1452461 13f79535-47bb-0310-9956-ffa450edef68
YARN-448. Remove unnecessary hflush from log aggregation (Kihwal Lee via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1452475 13f79535-47bb-0310-9956-ffa450edef68