leizhiyuan commented on issue #7830:
URL: https://github.com/apache/rocketmq/issues/7830#issuecomment-1951971926
```
public TopicRouteData getTopicRouteInfoFromNameServer(final String topic,
final long timeoutMillis,
boolean allowTopicNotExist) throws MQClientException,
InterruptedException, RemotingTimeoutException, RemotingSendRequestException,
RemotingConnectException {
GetRouteInfoRequestHeader requestHeader = new
GetRouteInfoRequestHeader();
requestHeader.setTopic(topic);
RemotingCommand request =
RemotingCommand.createRequestCommand(RequestCode.GET_ROUTEINFO_BY_TOPIC,
requestHeader);
RemotingCommand response = this.remotingClient.invokeSync(null,
request, timeoutMillis);
assert response != null;
switch (response.getCode()) {
case ResponseCode.TOPIC_NOT_EXIST: {
if (allowTopicNotExist) {
log.warn("get Topic [{}] RouteInfoFromNameServer is not
exist value", topic);
}
break;
}
case ResponseCode.SUCCESS: {
byte[] body = response.getBody();
if (body != null) {
return TopicRouteData.decode(body, TopicRouteData.class);
}
}
default:
break;
}
throw new MQClientException(response.getCode(),
response.getRemark());
}
```
if allowTopicNotExist is true, maybe we shoud not throw
throw new MQClientException(response.getCode(),
response.getRemark());
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