YARN-618. Modified RM_INVALID_IDENTIFIER to be -1 instead of zero. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478230 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5193. A few MR tests use block sizes which are smaller than the default minimum block size. Contributed by Andrew Wang.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1478250 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