[root@izyw77y42uhta7z rocketmq-all-4.3.2-bin-release]# sh bin/mqadmin updateTopic -n localhost:9876 -c DefaultCluster -t pushMessage
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option PermSize=128m; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=128m; support was removed in 8.0
org.apache.rocketmq.tools.command.SubCommandException: UpdateTopicSubCommand command failed
at org.apache.rocketmq.tools.command.topic.UpdateTopicSubCommand.execute(UpdateTopicSubCommand.java:181)
at org.apache.rocketmq.tools.command.MQAdminStartup.main0(MQAdminStartup.java:132)
at org.apache.rocketmq.tools.command.MQAdminStartup.main(MQAdminStartup.java:83)
Caused by: org.apache.rocketmq.remoting.exception.RemotingTimeoutException: wait response on the channel < localhost9876> timeout, 4943(ms)
at org.apache.rocketmq.remoting.netty.NettyRemotingAbstract.invokeSyncImpl(NettyRemotingAbstract.java:391)
at org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:374)
at org.apache.rocketmq.client.impl.MQClientAPIImpl.getBrokerClusterInfo(MQClientAPIImpl.java:1180)
at org.apache.rocketmq.tools.admin.DefaultMQAdminExtImpl.examineBrokerClusterInfo(DefaultMQAdminExtImpl.java:275)
at org.apache.rocketmq.tools.admin.DefaultMQAdminExt.examineBrokerClusterInfo(DefaultMQAdminExt.java:222)
at org.apache.rocketmq.tools.command.CommandUtil.fetchMasterAddrByClusterName(CommandUtil.java:83)
at org.apache.rocketmq.tools.command.topic.UpdateTopicSubCommand.execute(UpdateTopicSubCommand.java:154)
所以说有什么用？