Failed to start data node

Fri, 20 Jun 2008 02:02:16 -0700 

Hi All,

I failed to start a data node with this error:
08/06/20 22:45:12 ERROR dfs.DataNode: java.io.IOException:
Incompatible namespaceIDs in /tmp/hadoop-root/dfs/data: namenode
namespaceID = 1155595258; datanode namespaceID = 1616847836
        at org.apache.hadoop.dfs.DataStorage.doTransition(DataStorage.java:298)
        at 
org.apache.hadoop.dfs.DataStorage.recoverTransitionRead(DataStorage.java:142)
        at org.apache.hadoop.dfs.DataNode.startDataNode(DataNode.java:253)
        at org.apache.hadoop.dfs.DataNode.<init>(DataNode.java:171)
        at org.apache.hadoop.dfs.DataNode.makeInstance(DataNode.java:2765)
        at 
org.apache.hadoop.dfs.DataNode.instantiateDataNode(DataNode.java:2720)
        at org.apache.hadoop.dfs.DataNode.createDataNode(DataNode.java:2728)
        at org.apache.hadoop.dfs.DataNode.main(DataNode.java:2850)

This node belonged to another Hadoop cluster, now I want to add it
into a new Hadoop cluster, but fail.
Any help are welcome!

Regards,
Qian

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