YARN-1243. ResourceManager: Error in handling event type NODE_UPDATE to the scheduler - NPE at SchedulerApp.java:411 (Jason Lowe via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1526670 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5543. In-memory map outputs can be leaked after shuffle completes in 0.23 (Jason Lowe via jeagles)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1526677 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1526688 FIXES: MAPREDUCE-5513. ConcurrentModificationException in JobControl. Contributed by Robert Parker


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1526707 13f79535-47bb-0310-9956-ffa450edef68