HDFS-7217. Better batching of IBRs. Contributed by Kihwal Lee.
HADOOP-11175. Fix several issues of hadoop security configuration in user doc. Contributed by Yi Liu.
YARN-2493. Added user-APIs for using node-labels. Contributed by Wangda Tan.
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)
YARN-2629. Made the distributed shell use the domain-based timeline ACLs. Contributed by Zhijie Shen.
HADOOP-11174. Delegation token for KMS should only be got once if it already exists. (Yi Liu via wang)