MAPREDUCE-5958. Wrong reduce task progress if map output is compressed. Contributed by Emilio Coppa and Jason Lowe.
HDFS-7365. Remove hdfs.server.blockmanagement.MutableBlockCollection. Contributed by Li Lu.
HADOOP-11274. ConcurrentModificationException in Configuration Copy Constructor. Contributed by Junping Du.
YARN-2744. Fixed CapacityScheduler to validate node-labels correctly against queues. Contributed by Wangda Tan.
HDFS-7364. Balancer always shows zero Bytes Already Moved. Contributed by Tsz Wo Nicholas Sze.
Revert "HADOOP-11274. ConcurrentModificationException in Configuration Copy Constructor. Contributed by Junping Du."

This reverts commit 16b34824673f5a50d464727b8fad98470e5e984a.