MAPREDUCE-5268. Improve history server startup performance. Contributed by Karthik Kambatla


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1489012 13f79535-47bb-0310-9956-ffa450edef68
Move HADOOP-9397 to 2.1.0-beta after merging it into branch-2.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1489026 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5036. Default shuffle handler port should not be 8080. Contributed by Sandy Ryza.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1489060 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd