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updating docs
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ainsley
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Revocation
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<li class="chapter " data-level="5.3.5" data-path="../nats_tools/nsc/revocation.html">
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<a href="../nats_tools/nsc/revocation.html">
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Revocation
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</a>
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<a href="../nats_tools/nsc/managed.html">
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Managed Operators
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</a>
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@@ -2601,9 +2627,9 @@ nats-server --signal reload
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nats-server --signal ldm
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</code></pre>
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<p>If there are multiple <code>nats-server</code> processes running, or if <code>pgrep</code> isn't available, you must either specify a PID or the absolute path to a PID file:</p>
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<pre class="language-"><code class="lang-sh">nats-server --signal stop<span class="token operator">=</span><span class="token operator"><</span>pid<span class="token operator">></span>
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<pre class="language-"><code class="lang-sh">nats-server --signal <span class="token assign-left variable">stop</span><span class="token operator">=</span><span class="token operator"><</span>pid<span class="token operator">></span>
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</code></pre>
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<pre class="language-"><code class="lang-sh">nats-server --signal stop<span class="token operator">=</span>/path/to/pidfile
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<pre class="language-"><code class="lang-sh">nats-server --signal <span class="token assign-left variable">stop</span><span class="token operator">=</span>/path/to/pidfile
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</code></pre>
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<p>See the <a href="../nats_server/windows_srv.html">Windows Service</a> section for information on signaling the NATS server on Windows.</p>
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@@ -2649,7 +2675,7 @@ nats-server --signal ldm
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<li class="chapter " data-level="5.3.5" data-path="../nats_tools/nsc/revocation.html">
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<a href="../nats_tools/nsc/revocation.html">
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Revocation
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</a>
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</li>
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<li class="chapter " data-level="5.3.6" data-path="../nats_tools/nsc/managed.html">
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<a href="../nats_tools/nsc/managed.html">
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Managed Operators
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</a>
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@@ -2583,13 +2609,13 @@ nc<span class="token punctuation">,</span> err <span class="token operator">:=</
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</code></pre>
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<p>With this example code and default settings, a slow consumer error would generate output something like this:</p>
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<pre class="language-"><code class="lang-sh">error: nats: slow consumer, messages dropped
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Falling behind with 65536 pending messages on subject <span class="token string">"foo"</span><span class="token keyword">.</span>
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Falling behind with <span class="token number">65536</span> pending messages on subject <span class="token string">"foo"</span><span class="token builtin class-name">.</span>
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</code></pre>
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<p>Note that if you are using a synchronous subscriber, <code>Subscription.NextMsg(timeout time.Duration)</code> will also return an error indicating there was a slow consumer and messages have been dropped.</p>
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<h2 id="slow-consumers-identified-by-the-server"><a name="slow-consumers-identified-by-the-server" class="plugin-anchor" href="#slow-consumers-identified-by-the-server"><i class="fa fa-link" aria-hidden="true"></i></a>Slow consumers identified by the server</h2>
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<p>When a client does not process messages fast enough, the server will buffer messages in the outbound connection to the client. When this happens and the server cannot write data fast enough to the client, in order to protect itself, it will designate a subscriber as a "slow consumer" and may drop the associated connection.</p>
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<p>When the server initiates a slow consumer error, you'll see the following in the server output:</p>
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<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span>54083<span class="token punctuation">]</span> 2017/09/28 14:45:18.001357 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> ::1:63283 - cid:7 - Slow Consumer Detected
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<pre class="language-"><code class="lang-sh"><span class="token punctuation">[</span><span class="token number">54083</span><span class="token punctuation">]</span> <span class="token number">2017</span>/09/28 <span class="token number">14</span>:45:18.001357 <span class="token punctuation">[</span>INF<span class="token punctuation">]</span> ::1:63283 - cid:7 - Slow Consumer Detected
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</code></pre>
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<p>The server will also keep count of the number of slow consumer errors encountered, available through the monitoring <code>varz</code> endpoint in the <code>slow_consumers</code> field.</p>
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<h2 id="handling-slow-consumers"><a name="handling-slow-consumers" class="plugin-anchor" href="#handling-slow-consumers"><i class="fa fa-link" aria-hidden="true"></i></a>Handling slow consumers</h2>
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@@ -2661,7 +2687,7 @@ Falling behind with 65536 pending messages on subject <span class="token string"
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<script>
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var gitbook = gitbook || [];
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gitbook.push(function() {
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gitbook.page.hasChanged({"page":{"title":"Slow Consumers","level":"4.6.2","depth":2,"next":{"title":"Signals","level":"4.6.3","depth":2,"path":"nats_admin/signals.md","ref":"nats_admin/signals.md","articles":[]},"previous":{"title":"Upgrading a Cluster","level":"4.6.1","depth":2,"path":"nats_admin/upgrading_cluster.md","ref":"nats_admin/upgrading_cluster.md","articles":[]},"dir":"ltr"},"config":{"plugins":["prism","-sharing","-highlight","include-html","toggle-chapters","anchors","edit-link"],"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"prism":{"lang":{"ascii":"markup","text":"markup"}},"search":{},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"include-html":{},"fontsettings":{"theme":"white","family":"sans","size":2},"edit-link":{"label":"edit","base":"https://github.com/nats-io/docs/edit/master"},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false},"anchors":{},"toggle-chapters":{}},"theme":"default","author":"The NATS Maintainers","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"title":"NATS","gitbook":"*","description":"Administrative, developer and conceptual documentation for the NATS messaging system."},"file":{"path":"nats_admin/slow_consumers.md","mtime":"2019-06-05T22:32:07.014Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2019-09-05T21:19:53.626Z"},"basePath":"..","book":{"language":""}});
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});
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</script>
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</div>
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@@ -1504,6 +1504,32 @@
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</li>
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<li class="chapter " data-level="5.3.5" data-path="../nats_tools/nsc/revocation.html">
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<a href="../nats_tools/nsc/revocation.html">
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Revocation
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</a>
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</li>
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<li class="chapter " data-level="5.3.6" data-path="../nats_tools/nsc/managed.html">
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<a href="../nats_tools/nsc/managed.html">
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Managed Operators
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</a>
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</li>
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@@ -2557,7 +2583,7 @@
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<p>Note that since each server stores it's own permission and authentication configuration, new servers added to a cluster should provide the same users and authorization to prevent clients from getting rejected or gaining unexpected privileges.</p>
|
||||
<p>For purposes of describing the scenario, let's get some fingers on keyboards, and go through the motions. Let's consider a cluster of two servers: 'A' and 'B', and yes - clusters should be <em>three</em> to <em>five</em> servers, but for purposes of describing the behavior and cluster upgrade process, a cluster of two servers will suffice. </p>
|
||||
<p>Let's build this cluster:</p>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4222 -cluster nats://localhost:6222 -routes nats://localhost:6222,nats://localhost:6333
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4222</span> -cluster nats://localhost:6222 -routes nats://localhost:6222,nats://localhost:6333
|
||||
</code></pre>
|
||||
<p>The command above is starting nats-server with debug output enabled, listening for clients on port 4222, and accepting cluster connections on port 6222. The <code>-routes</code> option specifies a list of nats URLs where the server will attempt to connect
|
||||
to other servers. These URLs define the cluster ports enabled on the cluster peers.</p>
|
||||
@@ -2566,7 +2592,7 @@ to other servers. These URLs define the cluster ports enabled on the cluster pee
|
||||
<pre class="language-"><code class="lang-ascii"> Error trying to connect to route: dial tcp localhost:6333: connect: connection refused
|
||||
</code></pre>
|
||||
<p>Let's fix that, by starting the second server:</p>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4333 -cluster nats://localhost:6333 -routes nats://localhost:6222,nats://localhost:6333
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<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4333</span> -cluster nats://localhost:6333 -routes nats://localhost:6222,nats://localhost:6333
|
||||
</code></pre>
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||||
<p>The second server was started on port 4333 with its cluster port on 6333. Otherwise the same as 'A'.</p>
|
||||
<p>Let's get one client, so we can observe it moving between servers as servers get removed:</p>
|
||||
@@ -2576,27 +2602,27 @@ to other servers. These URLs define the cluster ports enabled on the cluster pee
|
||||
<p>We have two servers and a client. Time to simulate our rolling upgrade. But wait, before we upgrade 'A', let's introduce a new server 'C'. Server 'C' will join the existing cluster while we perform the upgrade. Its sole purpose is to provide an additional place where clients can go other than 'A' and ensure we don't end up with a single server serving all the clients after the upgrade procedure. Clients will randomly select a server when connecting unless a special option is provided that disables that functionality (usually called 'DontRandomize' or 'noRandomize'). You can read more about <a href="../developer/reconnect/random.html">"Avoiding the Thundering Herd"</a>.
|
||||
Suffice it to say that clients redistribute themselves about evenly between all servers in the cluster. In our case 1/2 of the clients on 'A' will jump over to 'B' and the remaining half to 'C'.</p>
|
||||
<p>Let's start our temporary server:</p>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4444 -cluster nats://localhost:6444 -routes nats://localhost:6222,nats://localhost:6333
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4444</span> -cluster nats://localhost:6444 -routes nats://localhost:6222,nats://localhost:6333
|
||||
</code></pre>
|
||||
<p>After an instant or so, clients on 'A' learn of the new cluster member that joined. On our hands-on tutorial, <code>nats-sub</code> is now aware of 3 possible servers, 'A' (specified when we started the tool) and 'B' and 'C' learned from the cluster gossip.</p>
|
||||
<p>We invoke our admin powers and turn off 'A' by issuing a <code>CTRL+C</code> to the terminal on 'A' and observe that either 'B' or 'C' reports that a new client connected. That is our <code>nats-sub</code> client.</p>
|
||||
<p>We perform the upgrade process, update the binary for 'A', and restart 'A':</p>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4222 -cluster nats://localhost:6222 -routes nats://localhost:6222,nats://localhost:6333
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4222</span> -cluster nats://localhost:6222 -routes nats://localhost:6222,nats://localhost:6333
|
||||
</code></pre>
|
||||
<p>We move on to upgrade 'B'. Notice that clients from 'B' reconnect to 'A' and 'C'. We upgrade and restart 'B':</p>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4333 -cluster nats://localhost:6333 -routes nats://localhost:6222,nats://localhost:6333
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4333</span> -cluster nats://localhost:6333 -routes nats://localhost:6222,nats://localhost:6333
|
||||
</code></pre>
|
||||
<p>If we had more servers, we would continue the stop, update, restart rotation as we did for 'A' and 'B'. After restarting the last server, we can go ahead and turn off 'C.' Any clients on 'C' will redistribute to our permanent cluster members.</p>
|
||||
<h3 id="seed-servers"><a name="seed-servers" class="plugin-anchor" href="#seed-servers"><i class="fa fa-link" aria-hidden="true"></i></a>Seed Servers</h3>
|
||||
<p>In the examples above we started nats-server specifying two clustering routes. It is possible to allow the server gossip protocol drive it and reduce the amount of configuration. You could for example start A, B and C as follows:</p>
|
||||
<h4 id="a---seed-server"><a name="a---seed-server" class="plugin-anchor" href="#a---seed-server"><i class="fa fa-link" aria-hidden="true"></i></a>A - Seed Server</h4>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4222 -cluster nats://localhost:6222
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4222</span> -cluster nats://localhost:6222
|
||||
</code></pre>
|
||||
<h4 id="b"><a name="b" class="plugin-anchor" href="#b"><i class="fa fa-link" aria-hidden="true"></i></a>B</h4>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4333 -cluster nats://localhost:6333 -routes nats://localhost:6222
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4333</span> -cluster nats://localhost:6333 -routes nats://localhost:6222
|
||||
</code></pre>
|
||||
<h4 id="c"><a name="c" class="plugin-anchor" href="#c"><i class="fa fa-link" aria-hidden="true"></i></a>C</h4>
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p 4444 -cluster nats://localhost:6444 -routes nats://localhost:6222
|
||||
<pre class="language-"><code class="lang-bash">nats-server -D -p <span class="token number">4444</span> -cluster nats://localhost:6444 -routes nats://localhost:6222
|
||||
</code></pre>
|
||||
<p>Once they connect to the 'seed server', they will learn about all the other servers and connect to each other forming the full mesh.</p>
|
||||
|
||||
@@ -2642,7 +2668,7 @@ Suffice it to say that clients redistribute themselves about evenly between all
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|
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|
||||
Reference in New Issue
Block a user