hadoop2.2中datanode启动不了

查看datanode日志如下

tail -f hadoop-hadoop-datanode-localhost.log
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org.apache.hadoop.hdfs.server.common.Storage: Lock on /hadoop/dfs/data/in_use.lock acquired by nodename 3176@localhost.localdomain
2013-12-17 09:37:37,849 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool BP-118139405-127.0.0.1-1387244216848 (storage id DS-1555732297-127.0.0.1-50010-1387210909439) service to /192.168.101.205:9000
java.io.IOException: Incompatible clusterIDs in /hadoop/dfs/data: namenode clusterID = CID-5cc652c0-b894-4a4a-865e-f429bb7ab426; datanode clusterID = CID-6f9592c7-3813-4723-86d8-923b0ddc71df
        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)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:837)
        at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:808)
        at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:280)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:222)
        at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664)
        at java.lang.Thread.run(Thread.java:662)
2013-12-17 09:37:37,851 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool BP-118139405-127.0.0.1-1387244216848 (storage id DS-1555732297-127.0.0.1-50010-1387210909439) service to /192.168.101.205:9000
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从上面可以得到

namenode clusterID = CID-5cc652c0-b894-4a4a-865e-f429bb7ab426
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由于namenode id 和 datanode id不一致导致 datanode不能正常启动

解决办法

[hadoop@localhost ~]$ vi dfs/data/current/VERSION
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#Tue Dec 17 22:22:14 CST 2013
storageID=DS-871617491-127.0.0.1-50010-1387268095088
clusterID=CID-630bf54f-7043-46f7-80dc-4013fa91b7b4
cTime=0
storageType=DATA_NODE
layoutVersion=-47
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将上面的信息改为下面的内容

#Tue Dec 17 22:22:14 CST 2013
storageID=DS-871617491-127.0.0.1-50010-1387268095088
clusterID=CID-5cc652c0-b894-4a4a-865e-f429bb7ab426
cTime=0
storageType=DATA_NODE
layoutVersion=-47
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重启一下hadoop就ok了