MAPREDUCE-5694. Fixed MR AppMaster to shutdown the LogManager so as to avoid losing syslog in some conditions. Contributed by Mohammad Kamrul Islam.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553879 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5196. Add bookkeeping for managing checkpoints of task state.
Contributed by Carlo Curino


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1553939 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch: upstream/trunk