HDFS-6100. DataNodeWebHdfsMethods does not failover in HA mode. Contributed by Haohui Mai.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1579301 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10221. Add a plugin to specify SaslProperties for RPC protocol based on connection properties. (Contributed by Benoy Antony and Daryn Sharp)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1579382 13f79535-47bb-0310-9956-ffa450edef68
HADOOP-10221. Add file missed in previous checkin, fix typo.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1579387 13f79535-47bb-0310-9956-ffa450edef68
HDFS-6123. Do not log stack trace for ReplicaAlreadyExistsException and SocketTimeoutException.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1579396 13f79535-47bb-0310-9956-ffa450edef68