HDFS-6503. Fix typo of DFSAdmin restoreFailedStorage. Contributed by Zesheng Wu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601958 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6315. Decouple recording edit logs from FSDirectory. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601960 13f79535-47bb-0310-9956-ffa450edef68
YARN-2124. Fixed NPE in ProportionalCapacityPreemptionPolicy. Contributed by Wangda Tan

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1601964 13f79535-47bb-0310-9956-ffa450edef68