HADOOP-10208. Remove duplicate initialization in StringUtils.getStringCollection. Contributed by Benoy Antony.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556602 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10207. TestUserGroupInformation#testLogin is flaky (jxiang via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556664 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10214. Fix multithreaded correctness warnings in ActiveStandbyElector (Liang Xie via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556734 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5721. sharedEditsImage in Namenode#initializeSharedEdits() should be closed before method returns. (Ted Yu via junping_du)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556803 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5449. WebHdfs compatibility broken between 2.2 and 1.x / 23.x. Contributed by Kihwal Lee.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556927 13f79535-47bb-0310-9956-ffa450edef68
YARN-1138. yarn.application.classpath is set to point to  etc., which does not work on Windows. Contributed by Chuan Liu.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556978 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9420. Add percentile or max metric for rpcQueueTime, processing time. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1556983 13f79535-47bb-0310-9956-ffa450edef68
YARN-1579. ActiveRMInfoProto fields should be optional (kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1557001 13f79535-47bb-0310-9956-ffa450edef68
Merge r1555021 through r1557038 from trunk.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1557039 13f79535-47bb-0310-9956-ffa450edef68