svn merge -c 1543117 FIXES: YARN-1419. TestFifoScheduler.testAppAttemptMetrics fails intermittently under jdk7. Contributed by Jonathan Eagles


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1543122 13f79535-47bb-0310-9956-ffa450edef68