HDFS-7399. Lack of synchronization in DFSOutputStream#Packet#getLastByteOffsetBlock() (Contributed by Vinayakumar B)

(cherry picked from commit 6783d17fcf5b25165767888f756a6b7802ab1371)
HDFS-7279. Use netty to implement DatanodeWebHdfsMethods. Contributed by Haohui Mai.
HADOOP-11157. ZKDelegationTokenSecretManager never shuts down listenerThreadPool. Contributed by Arun Suresh.
(cherry picked from commit 07d489e6230682e0553840bb1a0e446acb9f8d19)
YARN-2414. RM web UI: app page will crash if app is failed before any attempt has been created. Contributed by Wangda Tan
(cherry picked from commit 81c9d17af84ed87b9ded7057cb726a3855ddd32d)
HDFS-7146. NFS ID/Group lookup requires SSSD enumeration on the server. Contributed by Yongjun Zhang

(cherry picked from commit 351c5561c2fd380ab7746ca4e91d7b838e61e03f)
HADOOP-11311. Restrict uppercase key names from being created with JCEKS.

(cherry picked from commit 48d62fad80aaa13ee1a26fca14437722ed46da25)
MAPREDUCE-6162. mapred hsadmin fails on a secure cluster. Contributed by Jason Lowe
(cherry picked from commit 09b3dee122ad20fae22ae8de74886dbf11c39343)
YARN-2690. [YARN-2574] Make ReservationSystem and its dependent classes independent of Scheduler type. (Anubhav Dhoot via kasha)

(cherry picked from commit 2fce6d61412843f0447f60cfe02326f769edae25)
HDFS-6982. nntop: top­-like tool for name node users. (Maysam Yabandeh via wang)

(cherry picked from commit dcb8e24427b02e2f3ff9a12d2eb1eb878e3443bb)
HDFS-7404. Remove o.a.h.hdfs.server.datanode.web.resources. Contributed by Li Lu.
Merge remote-tracking branch 'remotes/origin/branch-2' into branch-2