YARN-2604. Scheduler should consider max-allocation-* in conjunction with the largest node. (Robert Kanter via kasha)
(cherry picked from commit 3114d4731dcca7cb6c16aaa7c7a6550b7dd7dccb)
HDFS-7420. Delegate permission checks to FSDirectory. Contributed by Haohui Mai.
YARN-2679. Add metric for container launch duration. (Zhihai Xu via kasha)

(cherry picked from commit 233b61e495e136a843dabb7315bbb9ea37e7adce)
Update release date for 2.5.2

(cherry picked from commit 1e9a3f42ff49be788ac99e5f06a7984d1d0638cc)
YARN-2669. FairScheduler: queue names shouldn't allow periods (Wei Yan via Sandy Ryza)
HDFS-7331. Add Datanode network counts to datanode jmx page. Contributed by Charles Lamb.
(cherry picked from commit ffa8c1a1b437cf0dc6d98a9b29161d12919e5afa)
HDFS-7425. NameNode block deletion logging uses incorrect appender. Contributed by Chris Nauroth.

(cherry picked from commit b8c094b0754099f13d668081b4afcf0644e325c3)
Merge remote-tracking branch 'remotes/origin/branch-2' into branch-2