YARN-2843. Fixed NodeLabelsManager to trim inputs for hosts and labels so as to make them work correctly. Contributed by Wangda Tan.
HDFS-7381. Decouple the management of block id and gen stamps from FSNamesystem. Contributed by Haohui Mai.
HDFS-7387. NFS may only do partial commit due to a race between COMMIT and write. Contributed by Brandon Li