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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-64005] Add metric to track the &apos;fullness&apos; of the TCP accept queue</title>
                <link>https://jira.mongodb.org/browse/SERVER-64005</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket concerns connections incoming to a mongos or mongod &amp;#8211; we call the incoming connection path the ingress layer. Before the ingress layer accepts a connection, this connection sits in the &lt;a href=&quot;https://veithen.io/2014/01/01/how-tcp-backlog-works-in-linux.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;accept queue &lt;/a&gt; on the TCP layer.&lt;/p&gt;

&lt;p&gt;The accept queue has a fixed size, and when the queue is full, the OS will start dropping incoming connections at the pre-mongo level. An overflowing queue means that either a mongo process is not accepting connections fast enough, or that the kernel is throttling connection establishment.&lt;/p&gt;

&lt;p&gt;Of particular note are generic TCP metrics &lt;tt&gt;TcpExtListenOverflows&lt;/tt&gt; and &lt;tt&gt;TcpExtListenDrops&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1990532">SERVER-64005</key>
            <summary>Add metric to track the &apos;fullness&apos; of the TCP accept queue</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>diagnostics</label>
                    </labels>
                <created>Fri, 25 Feb 2022 18:29:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:41:57 +0000</updated>
                            <resolved>Tue, 27 Sep 2022 13:45:44 +0000</resolved>
                                                    <fixVersion>6.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4846442" author="xgen-internal-githook" created="Wed, 21 Sep 2022 20:05:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64005&quot; title=&quot;Add metric to track the &amp;#39;fullness&amp;#39; of the TCP accept queue&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64005&quot;&gt;&lt;del&gt;SERVER-64005&lt;/del&gt;&lt;/a&gt; Add metric tracking listener socket backlog queue depth&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/02948a5102d2be9f5b727045cf787fc7dda2fcb7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/02948a5102d2be9f5b727045cf787fc7dda2fcb7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4383739" author="bruce.lucas@10gen.com" created="Tue, 1 Mar 2022 16:41:51 +0000"  >&lt;p&gt;This would be great - is there a way to track the accept queue length?&lt;/p&gt;

&lt;p&gt;Regarding&#160;&lt;tt&gt;TcpExtListenOverflows&lt;/tt&gt;&#160;and&#160;&lt;tt&gt;TcpExtListenDrops&lt;/tt&gt; - those are already captured in FTDC in the &quot;netstat&quot; section, but of course this only gives a signal once the queue fills up.&lt;/p&gt;</comment>
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            <issuekey id="2242465">DOCS-15844</issuekey>
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                            <customfieldvalue>This ticket concerns connections incoming to a mongos or mongod -- we call the incoming connection path the ingress layer. Before the ingress layer accepts a connection, this connection sits in the [accept queue |&lt;a href=&quot;https://veithen.io/2014/01/01/how-tcp-backlog-works-in-linux.html&quot;&gt;https://veithen.io/2014/01/01/how-tcp-backlog-works-in-linux.html&lt;/a&gt;] on the TCP layer.&lt;br/&gt;
&lt;br/&gt;
The accept queue has a fixed size, and when the queue is full, the OS will start dropping incoming connections at the pre-mongo level. An overflowing queue means that either a mongo process is not accepting connections fast enough, or that the kernel is throttling connection establishment.&lt;br/&gt;
&lt;br/&gt;
This ticket adds the {{listenerSocketBacklogQueueDepths}} section, with a depth added for each listener that is registered on the ingress transport layer. This will be an integer value.</customfieldvalue>

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