I am trying to start up a cluster and in the datanode log on the NameNode server I get the error:
2013-04-29 15:50:20,988 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /data/hadoop/dfs/data/in_use.lock acquired by nodename 1406@devUbuntu05 2013-04-29 15:50:20,990 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool BP-1306349046-172.16.26.68-1367256199559 (storage id DS-403514403-172.16.26.68-50010-1366406077018) service to devUbuntu05/172.16.26.68:9000 java.io.IOException: Incompatible clusterIDs in /data/hadoop/dfs/data: namenode clusterID = CID-23b9f9c7-2c25-411f-8bd2-4d5c9d7c25a1; datanode clusterID = CID-e3f6b811-c1b4-4778-a31e-14dea8b2cca8 at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:391) at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:191) at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:219)
How do I get around this error? What does the error mean? Thank you. Kevin
