schneiderlin opened a new issue, #6263:
URL: https://github.com/apache/rocketmq/issues/6263
**BUG REPORT**
if NettyRemotingClient.invokeSync timeout, the following error will be
thrown.
```
Caused by: org.apache.rocketmq.remoting.exception.RemotingTimeoutException:
invokeSync call the addr[null] timeout
at
org.apache.rocketmq.remoting.netty.NettyRemotingClient.invokeSync(NettyRemotingClient.java:563)
~[rocketmq-remoting-5.1.0.jar:5.1.0]
at
org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:1787)
~[rocketmq-client-5.1.0.jar:5.1.0]
at
org.apache.rocketmq.client.impl.MQClientAPIImpl.getTopicRouteInfoFromNameServer(MQClientAPIImpl.java:1778)
~[rocketmq-client-5.1.0.jar:5.1.0]
at
org.apache.rocketmq.client.impl.factory.MQClientInstance.updateTopicRouteInfoFromNameServer(MQClientInstance.java:609)
~[rocketmq-client-5.1.0.jar:5.1.0]
```
the error message said that `addr` is null, but it's not.
there are some caller for example
https://github.com/apache/rocketmq/blob/086f9d130ba7682533de7f449eabd4170071fa89/client/src/main/java/org/apache/rocketmq/client/impl/MQClientAPIImpl.java#L1785
call invokeSync method with null `addr` argument.
but the following line would get real address if `addr` is null.
https://github.com/apache/rocketmq/blob/2f93cbe051eb82834ee1ecba981c820a966190f3/remoting/src/main/java/org/apache/rocketmq/remoting/netty/NettyRemotingClient.java#L554
suggest changing error message to use `channel.remoteAddress()` instead
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