MAPREDUCE-5412. Update MR app to use multiple containers API of ContainerManager after YARN-926. Contributed by Jian He. svn merge --ignore-ancestry -c 1506391 ../../trunk/ git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1506392 13f79535-47bb-0310-9956-ffa450edef68