2016-01-08 11:34:57,575 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for Block pool <registering> (Datanode Uuid unassigned) service to node167/172.24.2.167:9000. Exiting.
java.io.IOException: Incompatible clusterIDs in /opt/hadoop_data/dfs/data: namenode clusterID = CID-9f0a13ce-d7cc-423b-aa43-4d60e63d8392; datanode clusterID = CID-29ff9b68-91aa-460e-aa06-816513a36add
at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:646)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.addStorageLocations(DataStorage.java:320)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:403)
at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:422)
解决方案：
将目录、dfs、name、data清空
是重复启动到时key值不一样
