执行“hdfs dfs -ls /”出现“Operation category READ is not supported in state standby”报错解决
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问题:
17/07/05 17:15:28 INFO retry.RetryInvocationHandler: Exception while invoking getFileInfo of class ClientNamenodeProtocolTranslatorPB over vm1/192.168.137.121:9000 after 5 fail over attempts. Trying to fail over after sleeping for 19260ms.java.net.ConnectException: Call From vm1/192.168.137.121 to vm1:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
解读
查看报错信息中,有一个“ConnectionRefused”,初步认为节点之间连接问题。
然后 jps 查看一下,发现 namenode居然没有跟着启动。
症结
报错中 vm1 namenode没有启动。
解决
hdfs haadmin -getServiceState vm1
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