HDFS-3493. Invalidate corrupted blocks as long as minimum replication is satisfied. Contributed by Juan Yu and Vinayakumar B.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602291 13f79535-47bb-0310-9956-ffa450edef68
Fixup CHANGES.txt message for HDFS-3493

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602292 13f79535-47bb-0310-9956-ffa450edef68
YARN-2155. FairScheduler: Incorrect threshold check for preemption. (Wei Yan via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602295 13f79535-47bb-0310-9956-ffa450edef68
YARN-1702. Added kill app functionality to RM web services. Contributed by Varun Vasudev.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1602298 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-6350. Document Hadoop Metrics. (Contributed by Akira Ajisaka)

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