hadoop从机datanode 启动失败，日志错误：java.io.IOException: Incompatible clusterIDs，Initialization failed for Bl

姗姗er

于 2019-06-20 10:12:29 发布

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分类专栏： hadoop error 文章标签：群起hadoop集群，从机datanode启动失败解决

本文链接：https://blog.youkuaiyun.com/weixin_42760864/article/details/92977130

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在搭建Hadoop集群过程中，遇到从节点datanode启动失败，日志显示Incompatible clusterIDs错误。原因是namenode和datanode的clusterID不匹配。解决方案是将从机的clusterID改为与namenode一致，修改相应文件后重启datanode即可解决问题。

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当群起Hadoop集群时候，发现两台从机的datanode启动都是失败的状态，查看日志发现，错误信息是：
2019-06-20 09:53:12,874 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Block pool (Datanode Uuid unassigned) service to hadoop102/192.168.31.102:9000 starting to offer service
2019-06-20 09:53:12,884 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting
2019-06-20 09:53:12,886 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 50020: starting
2019-06-20 09:53:13,354 INFO org.apache.hadoop.hdfs.server.common.Storage:
Lock on /opt/module/hadoop-2.7.2/data/tmp/dfs/data/in_use.lock acquired by nodename 8824@hadoop103
2019-06-20 09:53:13,356 WARN org.apache.hadoop.hdfs.server.common.Storage:
java.io.IOException: Incompatible clusterIDs in /opt/module/hadoop-2.7.2/data/tmp/dfs/data: namenode clusterID = CID-ca1a2572-90d0-457d-a9f1-c76ad99a0d30;
datanode clusterID = CID-3c0a4faa-c5b1-4942-96f7-5f5186e5152a
2019-06-20 09

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