MAPREDUCE-5234. Change mapred.TaskReport and mapreduce.TaskReport for binary compatibility with mapred in 1.x but incompatible with 0.23.x. Contributed by Mayank Bansal.
svn merge --ignore-ancestry -c 1483940 ../../trunk/


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1483941 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1483974 FIXES: MAPREDUCE-4927. Historyserver 500 error due to NPE when accessing specific counters page for failed job. Contributed by Ashwin Shankar


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1483976 13f79535-47bb-0310-9956-ffa450edef68