YARN-507. Add interface visibility and stability annotations to FS interfaces/classes. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480800 13f79535-47bb-0310-9956-ffa450edef68
YARN-637. FS: maxAssign is not honored. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480803 13f79535-47bb-0310-9956-ffa450edef68
YARN-655. Fair scheduler metrics should subtract allocated memory from available memory. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480810 13f79535-47bb-0310-9956-ffa450edef68
YARN-598. Add virtual cores to queue metrics. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480817 13f79535-47bb-0310-9956-ffa450edef68
YARN-568. Add support for work preserving preemption to the FairScheduler.
Contributed by Carlo Curino and Sandy Ryza


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480837 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4810. several HDFS HA tests have timeouts that are too short. Contributed by Chris Nauroth


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1480842 13f79535-47bb-0310-9956-ffa450edef68