svn merge -c 1452372 FIXES: MAPREDUCE-5043. Fetch failure processing can cause AM event queue to backup and eventually OOM (Jason Lowe via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1452451 13f79535-47bb-0310-9956-ffa450edef68