HADOOP-10142. Avoid groups lookup for unprivileged users such as dr.who (vinay via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548763 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5554. Flatten INodeFile hierarchy: Replace INodeFileWithSnapshot with FileWithSnapshotFeature.  Contributed by jing9


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548796 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4983. Numeric usernames do not work with WebHDFS FS. Contributed by Yongjun Zhang.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548968 13f79535-47bb-0310-9956-ffa450edef68
YARN-807. When querying apps by queue, iterating over all apps is inefficient and limiting (Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548983 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5353. Short circuit reads fail when dfs.encrypt.data.transfer is enabled. Contributed by Colin Patrick McCabe.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548987 13f79535-47bb-0310-9956-ffa450edef68
YARN-1378. Implemented a cleaner of old finished applications from the RM state-store. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548990 13f79535-47bb-0310-9956-ffa450edef68
YARN-1405. Fixed ResourceManager to not hang when init/start fails with an exception w.r.t state-store. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1548992 13f79535-47bb-0310-9956-ffa450edef68
YARN-1448. AM-RM protocol changes to support container resizing (Wangda Tan via Sandy Ryza)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1549627 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'apache/trunk' into YARN-1363
The production code is almost done.