YARN-1611. Introduced the concept of a configuration provider which can be used by ResourceManager to read configuration locally or from remote systems so as to help RM failover. Contributed by Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1564002 13f79535-47bb-0310-9956-ffa450edef68
YARN-1498 addendum to fix findbugs warning

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1564018 13f79535-47bb-0310-9956-ffa450edef68
YARN-1639. Modified RM HA configuration handling to have a way of not requiring separate configuration files for each RM. Contributed by Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1564032 13f79535-47bb-0310-9956-ffa450edef68
YARN-1659. Defined the ApplicationTimelineStore store as an abstraction for implementing different storage impls for storing timeline information. Contributed by Billie Rinaldi.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1564037 13f79535-47bb-0310-9956-ffa450edef68
YARN-1668. Modified RM HA handling of admin-acls to be available across RM failover by making using of a remote configuration-provider. Contributed by Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1564043 13f79535-47bb-0310-9956-ffa450edef68