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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-63261] Add metrics for wait time for requests to acquire egress connections</title>
                <link>https://jira.mongodb.org/browse/SERVER-63261</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On sharded clusters, client requests and system operations need to be routed from mongos to mongod, and occasionally from mongod to mongod. These requests need to acquire an outbound connection from the source host to the target host. This process is asynchronous, and we don&apos;t know how long it takes for requests to acquire a connection. As a result, it&apos;s difficult for us to determine when egress connection pooling might be a bottleneck for servicing requests, or what the exact impact on request latency is when the connection pool is under strain.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We should add metrics that answer the question: &apos;how much time does a request from (serverA) to (serverB) spend waiting to acquire a connection?&apos; It might be best to use a histogram-based approach, in the style of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59858&quot; title=&quot;Add observability for tasks scheduled on the reactor thread&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59858&quot;&gt;&lt;del&gt;SERVER-59858&lt;/del&gt;&lt;/a&gt;, where we maintain a histogram of wait-times for the last N connections/over the last X minutes. We could also &apos;rotate&apos; the histograms, where we always keep one for the last (say) minute, and then have an &apos;aggregated&apos; one of the last N minutes. It also would be ideal to collect the histograms on a per-targeted-host basis.&#160;&lt;/p&gt;

&lt;p&gt;Generally, egress connections are acquired by requests&#160;&#160;&lt;a href=&quot;https://github.com/10gen/mongo/blob/5c269981850650efe95735846fa4b2676a22376f/src/mongo/executor/network_interface_tl.cpp#L557-L573&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&#160;for the NITL-based task executors. ScopedDBConnection, defined &lt;a href=&quot;https://github.com/10gen/mongo/blob/04aea22a1bdffec3ff69a73bb85f089efad14b6f/src/mongo/client/connpool.h#L466&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, is also sometimes used to acquire connections, namely in the old &quot;scanning&quot; RSM, dbclient_rs, and a 1 or 2 sharded commands, but it may not be worth it to collect metrics for this outdated component.&#160;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1976880">SERVER-63261</key>
            <summary>Add metrics for wait time for requests to acquire egress connections</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="vojislav.stojkovic@mongodb.com">Vojislav Stojkovic</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Feb 2022 18:21:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:08 +0000</updated>
                            <resolved>Sat, 28 May 2022 05:12:30 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4579216" author="xgen-internal-githook" created="Sat, 28 May 2022 00:10:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vojislav Stojkovic&apos;, &apos;email&apos;: &apos;vojislav.stojkovic@mongodb.com&apos;, &apos;username&apos;: &apos;vstojkovic-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63261&quot; title=&quot;Add metrics for wait time for requests to acquire egress connections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63261&quot;&gt;&lt;del&gt;SERVER-63261&lt;/del&gt;&lt;/a&gt; Add metrics for wait time for requests to acquire egress connections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/136275a221896f712ee6ba874f6fb0aeb260cb28&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/136275a221896f712ee6ba874f6fb0aeb260cb28&lt;/a&gt;&lt;/p&gt;</comment>
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