[hadoop]ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in

ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /var/opt/cdh3/cluster/dfs/dn: namenode namespaceID = 1134851682; datanode namespaceID = 1188299446


rm -rf /var/opt/cdh3/cluster/dfs/dn/*


Re: jobtracker not starting up
http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201102.mbox/%3C30936184.post@talk.nabble.com%3E