HDFS-2975. Rename with overwrite flag true can make NameNode to stuck in safemode on NN (crash + restart). (Yi Liu via umamahesh)
HADOOP-10956. Fix create-release script to include docs and necessary txt files. (kasha)
YARN-2394. FairScheduler: Configure fairSharePreemptionThreshold per queue. (Wei Yan via kasha)
HDFS-6950. Add Additional unit tests for HDFS-6581. (Contributed by Xiaoyu Yao)
Merge trunk into HDFS-6581