Vanilla hadoop, master datanode log

2013-12-18 04:43:34,976 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: checkDiskError: exception:
java.net.SocketException: Original Exception : java.io.IOException: Connection reset by peer
    at sun.nio.ch.FileChannelImpl.transferTo0(Native Method)
    at sun.nio.ch.FileChannelImpl.transferToDirectly(FileChannelImpl.java:420)
    at sun.nio.ch.FileChannelImpl.transferTo(FileChannelImpl.java:552)
    at org.apache.hadoop.net.SocketOutputStream.transferToFully(SocketOutputStream.java:199)
    at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendChunks(BlockSender.java:393)
    at org.apache.hadoop.hdfs.server.datanode.BlockSender.sendBlock(BlockSender.java:491)
    at org.apache.hadoop.hdfs.server.datanode.DataNode$DataTransfer.run(DataNode.java:1548)
    at java.lang.Thread.run(Thread.java:724)
Caused by: java.io.IOException: Connection reset by peer
    ... 8 more