HDFS-4813. Add volatile to BlocksMap.blocks so that the replication thread can see the updated value.  Contributed by Jing Zhao


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482658 13f79535-47bb-0310-9956-ffa450edef68
HDFS-3180. Add socket timeouts to WebHdfsFileSystem.  Contributed by Chris Nauroth


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1482661 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-HDFS-4312-trunk-gd