duhenglucky commented on issue #1881: [ISSUE #1879] Prevent blocked by group transfer service URL: https://github.com/apache/rocketmq/pull/1881#issuecomment-610735743 > > > 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 > > Yes, that's why i apply `thenApplyAsync` method on `SendMessageProcessor#handlePutMessageResult`, it returns the real response yep, actually ctx.writeAndFlush is also a blocking operation, let us polish it in your PR.
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