HDFS-6609. Use DirectorySnapshottableFeature to represent a snapshottable directory. Contributed by Jing Zhao.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608631 13f79535-47bb-0310-9956-ffa450edef68
YARN-2158. Improved assertion messages of TestRMWebServicesAppsModification. Contributed by Varun Vasudev.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608667 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4286. Changes from BOOKKEEPER-203 broken capability of including bookkeeper-server jar in hidden package of BKJM. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608764 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4221. Remove the format limitation point from BKJM documentation as HDFS-3810 closed. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608776 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5411. Update Bookkeeper dependency to 4.2.3. Contributed by Rakesh R.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608781 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6614. Addendum patch to shorten TestPread run time with smaller retry timeout setting. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608846 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10781. Unportable getgrouplist usage breaks FreeBSD (Dmitry Sivachenko via Colin Patrick McCabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608869 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6638. Shorten test run time with a smaller retry timeout setting. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608905 13f79535-47bb-0310-9956-ffa450edef68
move HADOOP-10781 to 2.6

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608936 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6627. Rename DataNode#checkWriteAccess to checkReadAccess. Contributed by Liang Xie.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1608940 13f79535-47bb-0310-9956-ffa450edef68
HDFS-5202: add cacheadmin command support to hdfs.cmd.
HDFS-5202: skip ulimit check on Windows.
Merge branch 'trunk' into HDFS-5202