svn merge -c 1506226 FIXES: MAPREDUCE-5356. Ability to refresh aggregated log retention period and check interval. Contributed by Ashwin Shankar


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1506230 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9759. Merging change r1506325 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1506329 13f79535-47bb-0310-9956-ffa450edef68