HADOOP-10193. hadoop-auth's PseudoAuthenticationHandler can consume getInputStream. (gchanan via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1555957 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-3310. Custom grouping comparator cannot be set for Combiners (tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1555969 13f79535-47bb-0310-9956-ffa450edef68
YARN-1559. Race between ServerRMProxy and ClientRMProxy setting RMProxy#INSTANCE. (kasha and vinodkv via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1555971 13f79535-47bb-0310-9956-ffa450edef68
Merge r1555975 from trunk. YARN-1560. Fixed TestYarnClient#testAMMRTokens failure with null AMRM token. (Contributed by Ted Yu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1555977 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5220 Expose group resolution time as metric (jxiang via cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1555986 13f79535-47bb-0310-9956-ffa450edef68