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ainsley
2019-06-07 10:00:40 -05:00
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docs/developer/concepts/acks.html
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<section class="normal markdown-section">
<h1 id="acknowledgements"><a name="acknowledgements" class="plugin-anchor" href="#acknowledgements"><i class="fa fa-link" aria-hidden="true"></i></a>Acknowledgements</h1>
<p>In a system with at-most-once semantics, there are times when messages are lost. If your application is doing request-reply then it can simply use timeouts to handle network and application failures. When you are using one-way messaging the easiest way to insure message delivery is to turn it into a request-reply with the concept of an acknowledgement message, or ACKS. In NATS an ACK can simply be an empty message, a message with no body.</p>
<p>In a system with at-most-once semantics, there are times when messages can be lost. If your application is doing request-reply it should use timeouts to handle any network or application failures. It is always a good idea to place a timeout on a requests and have code that deals with timeouts. When you are publishing an event or data stream, one way to insure message delivery is to turn it into a request-reply with the concept of an acknowledgement message, or ACKs. In NATS an ACK can simply be an empty message, a message with no payload.</p>
<div class="graphviz"><code data-viz="dot">
digraph nats_request_reply {
rankdir=LR
@@ -2381,7 +2381,7 @@ digraph nats_request_reply {
}
</code></div>
<p>Because the ACK can be empty it can take up very little network bandwidth, but the idea of the ACK turns a simple fire-and-forget into a fire-and-know world where the sender can be sure that the message was received by the other side, or with <a href="reqreply.html">scatter-gather</a>, several other sides.</p>
<p>Because the ACK can be empty it can take up very little network bandwidth, but the idea of the ACK turns a simple fire-and-forget into a fire-and-know world where the sender can be sure that the message was received by the other side, or with a <a href="reqreply.html">scatter-gather pattern</a>, several other sides.</p>
</section>
@@ -2425,7 +2425,7 @@ digraph nats_request_reply {
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