svn merge -c 1491611 FIXES: 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-2@1491614 13f79535-47bb-0310-9956-ffa450edef68