ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: org.apache.hadoop.ipc.RemoteException: java.io.IOException: verifyNodeRegistration: unknown datanode wh-9-132:50010
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.verifyNodeRegistration(FSNamesystem.java:3939)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.registerDatanode(FSNamesystem.java:2052)
at org.apache.hadoop.hdfs.server.namenode.NameNode.register(NameNode.java:735)
at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:512)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:966)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:962)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:960)
at org.apache.hadoop.ipc.Client.call(Client.java:740)
at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:221)
at $Proxy4.register(Unknown Source)
at org.apache.hadoop.hdfs.server.datanode.DataNode.register(DataNode.java:544)
at org.apache.hadoop.hdfs.server.datanode.DataNode.runDatanodeDaemon(DataNode.java:1251)
at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1294)
at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1415)
原来是namenode节点将它打入了黑名单
1.修改主节点的exclude.txt文件
删除此节点所对应的一行
2.刷新节点信息
在主节点执行如下命令
hadoop dfsadmin -refreshNodes
注意：不要重启集群，风险太大
3.重新启动datanode
在datanode节点执行如下命令
hadoop-daemon.sh start datanode
重启成功