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ainsley
2019-08-13 09:27:52 -05:00
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docs/nats_streaming/relation-to-nats.html
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<section class="normal markdown-section">
<h1 id="relation-to-nats"><a name="relation-to-nats" class="plugin-anchor" href="#relation-to-nats"><i class="fa fa-link" aria-hidden="true"></i></a>Relation to NATS</h1>
<p>NATS Streaming Server by default embeds a <a href="https://github.com/nats-io/nats-server" target="_blank">NATS</a> server. That is, the Streaming server is not a server per-se, but instead, a client to a NATS Server.<br>
It means that Streaming clients are not directly connected to the streaming server, but instead communicate with the streaming server <em>through</em> NATS Server.</p>
<p>NATS Streaming Server by default embeds a <a href="https://github.com/nats-io/nats-server" target="_blank">NATS</a> server. That is, the Streaming server is not a server per-se, but instead, a client to a NATS Server.</p>
<p>It means that Streaming clients are not directly connected to the streaming server, but instead communicate with the streaming server <em>through</em> NATS Server.</p>
<p>This detail is important when it comes to Streaming clients connections to the Streaming server. Indeed, since there is no direct connection, the server knows if a client is connected based on heartbeats.</p>
<p><strong><em>It is therefore strongly recommended for clients to close their connection when the application exit, otherwise the server will consider these clients connected (sending data, etc...) until it detects missing heartbeats.</em></strong></p>
<p><strong><em>It is therefore strongly recommended for clients to close their connection when the application exits, otherwise the server will consider these clients connected (sending data, etc...) until it detects missing heartbeats.</em></strong></p>
<p>The streaming server creates internal subscriptions on specific subjects to communicate with its clients and/or other servers.</p>
<p>Note that NATS clients and NATS Streaming clients cannot exchange data between each other. That is, if a streaming client publishes on <code>foo</code>, a NATS client subscribing on that same subject will not receive the messages. Streaming messages are NATS messages made of a protobuf. The streaming server is expected to send ACKs back to producers and receive ACKs from consumers. If messages were freely exchanged with the NATS clients, this would cause problems.</p>
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