YARN-1021. Yarn Scheduler Load Simulator. (ywskycn via tucu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1527059 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5268. NFS write commit verifier is not set in a few places. Contributed by Brandon Li

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1527087 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5265. Namenode fails to start when dfs.https.port is unspecified. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1527093 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5260. Merge zero-copy memory-mapped HDFS client reads to trunk and branch-2. Contributed by Chris Nauroth.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1527113 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4311-trunk-gd