datanode 由于和namenode版本不一致无法启动问题

报错日志：
Initialization failed for Block pool  (Datanode Uuid unassigned) service to bigdata1/10.5.46.201:8022. Exiting. 
java.io.IOException: All specified directories are failed to load.
	at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:473)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:1322)
	at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:1292)
	at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:320)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:225)
	at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:862)
	at java.lang.Thread.run(Thread.java:745)

总的概括是将datanode中的VERSION文件中的clusterID改成一致

首先看NameNode的id

然后分别改DataNode的id（有三个所以改了三个文件）

然后重启DataNode后OK！！！！