MAPREDUCE-5228. Bring back FileInputFormat.Counter and FileOuputFormat.Counter for binary compatibility with 1.x mapred APIs. Contributed by Mayank Bansal.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1488060 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-7391 Document Interface Classification from HADOOP-5073 (sanjay Radia)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1488069 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4310-trunk-gd