?跨集群訪問hdfs失敗

$ hdfs dfs -ls hdfs://test:8020/hbase ls: Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error

意思是namenode不可用，查看namenode狀態(tài)

hdfs-site.xml<property><name>dfs.ha.namenodes.nameservice1</name><value>namenode223,namenode47</value></property>

使用命令查看namenode狀態(tài)，發(fā)現(xiàn)主NameNode是在運行的。

$hdfs haadmin -getServiceState namenode223 active

此時如果查看namenode是standby模式可以使用以下命令前置切換主備?

hdfs haadmin -transitionToActive --forcemanual namenode47

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找了半天才發(fā)現(xiàn)test:8020是之前的namenode，后來NameNode被我遷移了，換成test2:8020，ok。

總結幾個命令，日常維護時使用：

#切換NameNode(強制切換主備)，前提是目前在用的NameNode是standby狀態(tài)，否則失敗 hdfs haadmin -transitionToActive --forcemanual namenode47#查看NameNode運行狀態(tài) hdfs haadmin -getServiceState namenode223 更多查看 $ hdfs haadmin -help Usage: DFSHAAdmin [-ns <nameserviceId>][-transitionToActive <serviceId> [--forceactive]][-transitionToStandby <serviceId>][-failover [--forcefence] [--forceactive] <serviceId> <serviceId>][-getServiceState <serviceId>][-checkHealth <serviceId>][-help <command>]Generic options supported are -conf <configuration file> specify an application configuration file -D <property=value> use value for given property -fs <local|namenode:port> specify a namenode -jt <local|resourcemanager:port> specify a ResourceManager -files <comma separated list of files> specify comma separated files to be copied to the map reduce cluster -libjars <comma separated list of jars> specify comma separated jar files to include in the classpath. -archives <comma separated list of archives> specify comma separated archives to be unarchived on the compute machines.The general command line syntax is bin/hadoop command [genericOptions] [commandOptions]

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總結

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