HADOOP-10882. Move DirectBufferPool into common util. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613006 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6657. Remove link to 'Legacy UI' in trunk's Namenode UI. Contributed by Vinayakumar B.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613195 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10894. Fix dead link in ToolRunner documentation. (Contributed by Akira Ajisaka)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613200 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6723. New NN webUI no longer displays decommissioned state for dead node. Contributed by Ming Ma.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613220 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6715. Webhdfs wont fail over when it gets java.io.IOException: Namenode is in startup mode. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613237 13f79535-47bb-0310-9956-ffa450edef68
Name node cannot start if the path of a file under construction contains .snapshot. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613329 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10891. Add EncryptedKeyVersion factory method to KeyProviderCryptoExtension. (wang)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613332 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5919. FileJournalManager doesn't purge empty and corrupt inprogress edits files (vinayakumarb)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613355 13f79535-47bb-0310-9956-ffa450edef68
YARN-2214. FairScheduler: preemptContainerPreCheck() in FSParentQueue delays convergence towards fairness. (Ashwin Shankar via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613459 13f79535-47bb-0310-9956-ffa450edef68
YARN-2335. Annotate all hadoop-sls APIs as @Private. (Wei Yan via kasha)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1613478 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' into HDFS-5642
HDFS-5642: fix compiler warnings in test_libhdfs_threaded.c.