HDFS-4996. ClientProtocol#metaSave can be made idempotent by overwriting the output file instead of appending to it. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504679 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9164. Print paths of loaded native libraries in NativeLibraryChecker. (Binglin Chang via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504700 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9717. Add retry attempt count to the RPC requests. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504725 13f79535-47bb-0310-9956-ffa450edef68
YARN-814. Improving diagnostics when containers fail during launch due to various reasons like invalid env etc. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504732 13f79535-47bb-0310-9956-ffa450edef68
YARN-918. Remove ApplicationAttemptId from RegisterApplicationMasterRequestProto. Contributed by Vinod K V.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504735 13f79535-47bb-0310-9956-ffa450edef68
Fixed CHANGES.txt to reflect that all fixes in 2.1.1-beta are now in 2.1.0-beta.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1504738 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-xxx-hadoop-auth-kerberos-realm-trunk-gd