svn merge -c 1426515 FIXES: YARN-225. Proxy Link in RM UI thows NPE in Secure mode (Devaraj K via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1426516 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1426536 FIXES: MAPREDUCE-4813. AM timing out during job commit (jlowe via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1426539 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4308. addBlock() should persist file blocks once. Contributed by Plamen Jeliazkov.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1426703 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4347. Avoid infinite waiting checkpoint to complete in TestBackupNode. Contributed by Plamen Jeliazkov.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1426706 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4349. Add test for reading files from BackupNode. Contributed by Konstantin Shvachko.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1427291 13f79535-47bb-0310-9956-ffa450edef68