YARN-2857. ConcurrentModificationException in ContainerLogAppender. Contributed by Mohammad Kamrul Islam
HADOOP-11257. Update "hadoop jar" documentation to warn against using it for launching yarn jars (iwasakims via cmccabe)
Revert HADOOP-11257 because it didn't get a jenkins run yet
MAPREDUCE-6161. mapred hsadmin command missing from trunk. Contributed by Allen Wittenauer