HDFS-4633 TestDFSClientExcludedNodes fails sporadically if excluded nodes cache expires too quickly  (Chris Nauroth via Sanjay)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461846 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9125. LdapGroupsMapping threw CommunicationException after some idle time. Contributed by Kai Zheng.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461863 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd