HDFS-7217. Better batching of IBRs. Contributed by Kihwal Lee.
(cherry picked from commit db71bb54bcc75b71c5841b25ceb03fb0218c6d4f)
HADOOP-11175. Fix several issues of hadoop security configuration in user doc. Contributed by Yi Liu.

(cherry picked from commit 1123a06e3658f26228f1eedaed796aca8efc7bad)
YARN-2493. Added user-APIs for using node-labels. Contributed by Wangda Tan.

(cherry picked from commit 180afa2f86f9854c536c3d4ff7476880e41ac48d)
HDFS-7195. Update user doc of secure mode about Datanodes don't require root or jsvc. Contributed by Chris Nauroth.
HADOOP-11178. Fix findbugs exclude file. (Arun Suresh via wang)

(cherry picked from commit d7b647f0ee2c918143ff71abd9ce8b89717b2fc5)
YARN-2629. Made the distributed shell use the domain-based timeline ACLs. Contributed by Zhijie Shen.

(cherry picked from commit 1d4612f5ad9678c952b416e798dccd20c88f96ef)
HADOOP-11174. Delegation token for KMS should only be got once if it already exists. (Yi Liu via wang)

(cherry picked from commit 8d941144952a77a714cd4368cba21b01904926e9)
YARN-2598 GHS should show N/A instead of null for the inaccessible information (Zhijie Shen via mayank)