merge MAPREDUCE-5352. Optimize node local splits generated by CombineFileInputFormat. (sseth)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1509349 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1509389 FIXES: YARN-573. Shared data structures in Public Localizer and Private Localizer are not Thread safe. Contributed by Omkar Vinit Joshi


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2.1-beta@1509394 13f79535-47bb-0310-9956-ffa450edef68