on XX.YY.ZZ.AAA
2007-12-03 15:42:18,508 ERROR org.apache.hadoop.dfs.DataNode: DataXceiver: java.io.IOException: Block blk_3105072074036734167 has already been started (though not completed), and thus cannot be created.
       at org.apache.hadoop.dfs.FSDataset.writeToBlock(FSDataset.java:568)
at org.apache.hadoop.dfs.DataNode$BlockReceiver.<init>(DataNode.java:1257) at org.apache.hadoop.dfs.DataNode$DataXceiver.writeBlock(DataNode.java:901)
       at org.apache.hadoop.dfs.DataNode$DataXceiver.run(DataNode.java:804)
       at java.lang.Thread.run(Thread.java:619)

One one machine
2007-12-03 15:42:44,755 INFO org.apache.hadoop.dfs.DataNode: Starting thread to transfer block blk_3105072074036734167 to [Lorg.apache.hadoop.dfs.DatanodeInfo;@6fc40f 2007-12-03 15:42:44,757 WARN org.apache.hadoop.dfs.DataNode: Failed to transfer blk_3105072074036734167 to XX.YY.ZZ.AAA:50010 got java.net.SocketException: Broken pipe
       at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
       at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
       at java.io.BufferedOutputStream.write(BufferedOutputStream.java:109)
       at java.io.DataOutputStream.write(DataOutputStream.java:90)
at org.apache.hadoop.dfs.DataNode$BlockSender.sendChunk(DataNode.java:1175) at org.apache.hadoop.dfs.DataNode$BlockSender.sendBlock(DataNode.java:1208) at org.apache.hadoop.dfs.DataNode$DataTransfer.run(DataNode.java:1460)
       at java.lang.Thread.run(Thread.java:619)

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