MAPREDUCE-6156. Fetcher - connect() doesn't handle connection refused correctly. Contributed by Junping Du
YARN-2846. Incorrect persist exit code for running containers in reacquireContainer() that interrupted by NodeManager restart. Contributed by Junping Du
YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user kill request races with ApplicationMaster finish. Contributed by Jian He.