MAPREDUCE-5231. Bring back a constructor in mapred's DBInputFormat.DBRecordReader for binary compatibility with 1.x mapred APIs. Contributed by Zhijie Shen.
svn merge --ignore-ancestry -c 1488436 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1488437 13f79535-47bb-0310-9956-ffa450edef68
merge YARN-735 from trunk. Make ApplicationAttemptId, ContainerId and NodeId immutable. Contributed by Jian He.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1488440 13f79535-47bb-0310-9956-ffa450edef68
MAPREDUCE-5273. Bring back a couple of protected variables in mapred and mapreduce CombineFileRecordReader for binary compatibility with 1.x APIs. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1488442 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1488443 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-YARN-474-branch-2-gd