[Beginner]What does this function do in NSQ?

<p>Not sure if this is the right place to ask this question, but I am looking at this file for awhile and still can&#39;t quite figure out what it does.</p> <p>In this file <a href="https://github.com/nsqio/nsq/blob/master/apps/nsq_to_nsq/nsq_to_nsq.go" rel="nofollow">https://github.com/nsqio/nsq/blob/master/apps/nsq_to_nsq/nsq_to_nsq.go</a></p> <p>What does responder do?</p> <p>Why does the file need the responder besides just HandleMessage and republished the message ?</p> <p>Can someone help me out?</p> <p>Thanks</p> <hr/>**评论：**<br/><br/>girishramnani1234: <pre><p>The responder waits for the response from other nsqds and if the response is failure then it requeues the message. This ensures the atleast once message delivery design.</p></pre>bojar2: <pre><p>I see, that make alot of sense :)</p> <p>Thanks</p></pre>