HDFS-5138. Support HDFS upgrade in HA. Contributed by Aaron T. Myers.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561381 13f79535-47bb-0310-9956-ffa450edef68
YARN-321. Merging YARN-321 branch to trunk.
svn merge ../branches/YARN-321


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561452 13f79535-47bb-0310-9956-ffa450edef68
YARN-1625. Fixed RAT warnings after YARN-321 merge. Contributed by Shinichi Yamashita.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561458 13f79535-47bb-0310-9956-ffa450edef68
YARN-1613. Fixed the typo with the configuration name YARN_HISTORY_SERVICE_ENABLED. Contributed by Akira Ajisaka.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561461 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10203. Connection leak in Jets3tNativeFileSystemStore#retrieveMetadata. Contributed by Andrei Savu.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561720 13f79535-47bb-0310-9956-ffa450edef68
HDFS-10086. User document for authentication in secure cluster. (Contributed by Masatake Iwasaki)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561776 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5781. Use an array to record the mapping between FSEditLogOpCode and the corresponding byte value. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561788 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5825. Use FileUtils.copyFile() to implement DFSTestUtils.copyFile(). (Contributed by Haohui Mai)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561792 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9982. Fix dead links in hadoop site docs. (Contributed by Akira Ajisaka)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561813 13f79535-47bb-0310-9956-ffa450edef68
Fix correct CHANGES.txt for HADOOP-10086 and HADOOP-9982.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561819 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10212. Incorrect compile command in Native Library document. (Contributed by Akira Ajisaka)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561838 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5297. Fix dead links in HDFS site documents. (Contributed by Akira Ajisaka)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561849 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10250. VersionUtil returns wrong value when comparing two versions. Contributed by Yongjun Zhang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561860 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10288. Explicit reference to Log4JLogger breaks non-log4j users. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561882 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5830. WebHdfsFileSystem.getFileBlockLocations throws IllegalArgumentException when accessing another cluster. (Yongjun Zhang via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1561885 13f79535-47bb-0310-9956-ffa450edef68