duhenglucky commented on issue #1881: [ISSUE #1879] Prevent blocked by group transfer service URL: https://github.com/apache/rocketmq/pull/1881#issuecomment-610727791 > Run example `org.apache.rocketmq.example.quickstart.Producer` to send a msg. > > for debug, i add a sout here > > ```java > @Override > public void asyncProcessRequest(ChannelHandlerContext ctx, RemotingCommand request, RemotingResponseCallback responseCallback) throws Exception { > asyncProcessRequest(ctx, request).thenAcceptAsync( > r -> { > System.out.println(r); > responseCallback.callback(r); > }, > this.brokerController.getSendMessageExecutor()); > } > ``` > > debug result: > > 1. `org.apache.rocketmq.broker.processor.SendMessageProcessor#handlePutMessageResult` is invoked in GroupCommitService thread. > > ```java > { > System.out.println(r); > responseCallback.callback(r); > } > ``` > > is invoked in SendMessageThread_1, and r is null r is null just because of the succeed send message response returned to the client directly by org.apache.rocketmq.broker.processor.AbstractSendMessageProcessor#doResponse in org.apache.rocketmq.broker.processor.SendMessageProcessor#handlePutMessageResult method and these responses will not be processed by AfterRPCHook, the code here is a little confusing
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