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Review request for hadoop-hdfs. Summary ------- This patch introduces an RPC to the datanode to allow it to copy a block to a datanode on a remote HDFS cluster. This addresses bug HDFS-1593. https://issues.apache.org/jira/browse/HDFS-1593 Diffs ----- http://svn.apache.org/repos/asf/hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/protocol/ClientDatanodeProtocol.java 1062667 http://svn.apache.org/repos/asf/hadoop/hdfs/trunk/src/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java 1062667 Diff: https://reviews.apache.org/r/346/diff Testing ------- Thanks, Dhruba