HDFS-4760. Update inodeMap after node replacement.  Contributed by Jing Zhao


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1477827 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4758. Disallow nested snapshottable directories and unwrap RemoteException.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-2802@1477867 13f79535-47bb-0310-9956-ffa450edef68