YARN-1550. NPE in FairSchedulerAppsBlock#render. (Anubhav Dhoot via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1599345 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6109 let sync_file_range() system call run in background (Liang Xie via stack)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1599347 13f79535-47bb-0310-9956-ffa450edef68
YARN-1877. Updated CHANGES.txt to fix the JIRA number. It was previously committed as YARN-2010.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1599348 13f79535-47bb-0310-9956-ffa450edef68