YARN-1984. LeveldbTimelineStore does not handle db exceptions properly. Contributed by Varun Saxena
YARN-2697. Remove useless RMAuthenticationHandler. Contributed by Haosong Huang.
HDFS-7436. Consolidate implementation of concat(). Contributed by Haohui Mai.
HDFS-7303. NN UI fails to distinguish datanodes on the same host. Contributed by Benoy Antony.
HADOOP-11322. key based ACL check in KMS always check KeyOpType.MANAGEMENT even actual KeyOpType is not MANAGEMENT. (Dian Fu via yliu)