MAPREDUCE-4974. Optimising the LineRecordReader initialize() method (Gelesh via bobby)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1468232 13f79535-47bb-0310-9956-ffa450edef68
YARN-444. Moved special container exit codes from YarnConfiguration to API where they belong. Contributed by Sandy Ryza.
MAPREDUCE-5151. Updated MR AM to use standard exit codes from the API after YARN-444. Contributed by Sandy Ryza.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1468276 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4693. Some test cases in TestCheckpoint do not clean up after themselves. Contributed by Arpit Agarwal and Suresh.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1468457 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into HDFS-4699