HDFS-4521. Invalid network toploogies should not be cached. Contributed by Colin Patrick McCabe.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1457878 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-4990. Construct debug strings conditionally in ShuffleHandler.Shuffle#sendMapOutput(). (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1457914 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5028. Maps fail when io.sort.mb is set to high value. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1457918 13f79535-47bb-0310-9956-ffa450edef68
YARN-485. TestProcfsProcessTree#testProcessTree() doesn't wait long enough for the process to die. (kkambatl via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1457936 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-xxx-hadoop-auth-kerberos-realm-trunk-gd