HDFS-6617. Merging change r1608522 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608523 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10782. Merge r1608539 from trunk.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608541 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5868. Fixed an issue with TestPipeApplication that was causing the nightly builds to fail. Contributed by Akira Ajisaka.
svn merge --ignore-ancestry -c 1608579 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608580 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5866. Merging change r1608585 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608588 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5517. Fixed MapReduce ApplicationMaster to not validate reduce side resource configuration for deciding uber-mode on map-only jobs. Contributed by Siqi Li.
svn merge --ignore-ancestry -c 1608595 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608596 13f79535-47bb-0310-9956-ffa450edef68
YARN-2158. Improved assertion messages of TestRMWebServicesAppsModification. Contributed by Varun Vasudev.
svn merge --ignore-ancestry -c 1608667 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608668 13f79535-47bb-0310-9956-ffa450edef68
Merged from trunk. HDFS-4286. Changes from BOOKKEEPER-203 broken capability of including bookkeeper-server jar in hidden package of BKJM. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608769 13f79535-47bb-0310-9956-ffa450edef68
Merged from trunk. HDFS-4221. Remove the format limitation point from BKJM documentation as HDFS-3810 closed. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608777 13f79535-47bb-0310-9956-ffa450edef68
Mreged from trunk. HDFS-5411. Update Bookkeeper dependency to 4.2.3. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608784 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6614. Merging change r1608846 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608847 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10781. Unportable getgrouplist usage breaks FreeBSD (Dmitry Sivachenko via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608871 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6638. Merging change r1608905 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608911 13f79535-47bb-0310-9956-ffa450edef68
move HADOOP-10781 to 2.6

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608935 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6627. Merging change r1608940 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1608948 13f79535-47bb-0310-9956-ffa450edef68
Merged revision(s) 1609020 from hadoop/common/trunk:
   HDFS-6646. [ HDFS Rolling Upgrade - Shell ] shutdownDatanode and getDatanodeInfo usage is missed ( Contributed by Brahma Reddy Battula)



git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609021 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10801 dead link in site.xml

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609093 13f79535-47bb-0310-9956-ffa450edef68
Merge r1609254 from trunk. YARN-1366. Changed AMRMClient to re-register with RM and send outstanding requests back to RM on work-preserving RM restart. Contributed by Rohith

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609255 13f79535-47bb-0310-9956-ffa450edef68
YARN-2131. Add a way to format the RMStateStore. (Robert Kanter via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609280 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6618. FSNamesystem#delete drops the FSN lock between removing INodes from the tree and deleting them from the inode map (kihwal via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609381 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6622. Rename and AddBlock may race and produce invalid edits (kihwal via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1609386 13f79535-47bb-0310-9956-ffa450edef68