HADOOP-9439.  JniBasedUnixGroupsMapping: fix some crash bugs (Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1496115 13f79535-47bb-0310-9956-ffa450edef68
YARN-736. Add a multi-resource fair sharing metric. (sandyr via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1496154 13f79535-47bb-0310-9956-ffa450edef68