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hadoop-root-datanode-macmini.log中：
2015-03-12 23:52:33,671 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for Block pool <registering> (Datanode Uuid unassigned) service to localhost/127.0.0.1:9000. Exiting. java.io.IOException: Incompatible clusterIDs in /hdfs/name/dfs/data: namenode clusterID = CID-70d64aad-1dfe-4f87-af15-d53ff80db3dd; datanode clusterID = CID-388a9ec6-cb87-4b0d-97c4-3b4d5c787b76 原因是：
namenode與datanode的clusterID在重新格式化namenode以后已經(jīng)不再匹配，datanode無法啟動(dòng)。
另外：
此錯(cuò)誤會(huì)導(dǎo)致在hive導(dǎo)入數(shù)據(jù)時(shí)發(fā)生如下錯(cuò)誤（由于metadata不存在hdfs中，故create table并無報(bào)錯(cuò)）：
hive> load data local inpath '/root/dbfile' overwrite into table employees PARTITION (country='US', state='IL');
Loading data to table default.employees partition (country=US, state=IL) Failed with exception Unable to move source file:/root/dbfile to destination hdfs://localhost:9000/user/hive/warehouse/employees/country=US/state=IL/dbfile FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.MoveTas 解決方法：
將hdfs存儲(chǔ)數(shù)據(jù)的所在目錄刪掉，重新格式化hdfs（相關(guān)參數(shù)：dfs.name.dir dfs.data.dir）：(具體目錄看hadfs-site.xml文件）
hadoop namenode -format
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