MAPREDUCE-5963. ShuffleHandler DB schema should be versioned with compatible/incompatible changes. Contributed by Junping Du


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612652 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6712. Document HDFS Multihoming Settings. (Contributed by Arpit Agarwal)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612695 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6703. NFS: Files can be deleted from a read-only mount. Contributed by Srikanth Upputuri

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1612702 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5642: add htable.h and htable.c from HADOOP-10388 branch.
Merge branch 'trunk' into HDFS-5642