HDFS-7279. Use netty to implement DatanodeWebHdfsMethods. Contributed by Haohui Mai.
HADOOP-11157. ZKDelegationTokenSecretManager never shuts down listenerThreadPool. Contributed by Arun Suresh.
YARN-2414. RM web UI: app page will crash if app is failed before any attempt has been created. Contributed by Wangda Tan
HDFS-7146. NFS ID/Group lookup requires SSSD enumeration on the server. Contributed by Yongjun Zhang
HADOOP-11311. Restrict uppercase key names from being created with JCEKS.
MAPREDUCE-6162. mapred hsadmin fails on a secure cluster. Contributed by Jason Lowe
YARN-2690. [YARN-2574] Make ReservationSystem and its dependent classes independent of Scheduler type. (Anubhav Dhoot via kasha)
HDFS-6982. nntop: top­-like tool for name node users. (Maysam Yabandeh via wang)
HDFS-7404. Remove o.a.h.hdfs.server.datanode.web.resources. Contributed by Li Lu.