svn merge -c 1461146 FIXES: MAPREDUCE-4875. coverage fixing for org.apache.hadoop.mapred (Aleksey Gorshkov via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461149 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9405. TestGridmixSummary#testExecutionSummarizer is broken. (Andrew Wang via atm)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461205 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-3787. [Gridmix] Optimize job monitoring and STRESS mode for faster job submission. (amarrk via tgraves)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1461212 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9166-branch-2-gd