HADOOP-8415. Add getDouble() and setDouble() in org.apache.hadoop.conf.Configuration (Jan van der Lugt via harsh)
Merging into branch-2. Updating CHANGES.txt


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461727 13f79535-47bb-0310-9956-ffa450edef68
YARN-209. Fix CapacityScheduler to trigger application-activation when the cluster capacity changes. Contributed by Zhijie Shen.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461773 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4621. Additional logging to help diagnose slow QJM syncs. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461777 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4618. Default transaction interval for checkpoints is too low. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461783 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-9358. "Auth failed" log should include exception string. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1461788 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-xxx-hadoop-auth-kerberos-realm-trunk-gd