svn merge -c 1491548 FIXES: HADOOP-9581. hadoop --config non-existent directory should result in error. Contributed by Ashwin Shankar


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1491554 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5308. Shuffling to memory can get out-of-sync when fetching multiple compressed map outputs. Contributed by Nathan Roberts


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1491618 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-0.23' into branch-0.23-gd
Merge remote branch 'origin/branch-0.23-gd' into fb-HADOOP-9078-branch-0.23-gd