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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-57232] Increase in slow queries in ConnectionsBuildup case in Mongos on v4.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-57232</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The comment below, transcribed from the linked ticket, describes a worrying increase in the number of slow queries in the ConnectionsBuildup workload. It should be the case our performance is bottlenecked by networking (ConnectionPools in particular), but the connection stats indicate that our performance is actually bottlenecked elsewhere. In this ticket, investigate what caused this apparent regression and file a ticket to fix it.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1758450">SERVER-57232</key>
            <summary>Increase in slow queries in ConnectionsBuildup case in Mongos on v4.4</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="daniel.morilha@mongodb.com">Daniel Morilha</assignee>
                                    <reporter username="tyler.seip@mongodb.com">Tyler Seip</reporter>
                        <labels>
                            <label>servicearch-q4-2021</label>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Wed, 26 May 2021 22:02:01 +0000</created>
                <updated>Tue, 29 Mar 2022 18:07:55 +0000</updated>
                            <resolved>Tue, 29 Mar 2022 17:53:21 +0000</resolved>
                                    <version>4.4.0</version>
                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4442685" author="JIRAUSER1263891" created="Tue, 29 Mar 2022 17:53:21 +0000"  >&lt;p&gt;Removing story points and closing as duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57230&quot; title=&quot;mongos doesn&amp;#39;t distribute secondary reads evenly on v4.4 or above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57230&quot;&gt;&lt;del&gt;SERVER-57230&lt;/del&gt;&lt;/a&gt; which better describes the problem.&lt;/p&gt;</comment>
                            <comment id="4424879" author="JIRAUSER1263891" created="Mon, 21 Mar 2022 19:05:22 +0000"  >&lt;p&gt;The proposed fixes for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57230&quot; title=&quot;mongos doesn&amp;#39;t distribute secondary reads evenly on v4.4 or above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57230&quot;&gt;&lt;del&gt;SERVER-57230&lt;/del&gt;&lt;/a&gt; by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=vojislav.stojkovic&quot; class=&quot;user-hover&quot; rel=&quot;vojislav.stojkovic&quot;&gt;vojislav.stojkovic&lt;/a&gt; seem to also address the issue reported here.&lt;/p&gt;</comment>
                            <comment id="4319248" author="JIRAUSER1263891" created="Thu, 27 Jan 2022 19:42:00 +0000"  >&lt;p&gt;not actively working on it as of now.&lt;/p&gt;</comment>
                            <comment id="4312170" author="JIRAUSER1263891" created="Tue, 25 Jan 2022 15:02:31 +0000"  >&lt;p&gt;Another interesting fact by looking at the size of the generated logs of each &lt;em&gt;mongod&lt;/em&gt; entry. Master has an unevenly distributed load to one (assumed) secondary when compared to v4.2:&lt;/p&gt;

&lt;p&gt;&#160;&#160;&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$ find . -type f -path *connections_buildup*mongod.log -exec ls -lah {} + | awk &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&apos;{ print $5 &quot;\t&quot; $9 }&apos;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;;&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;152K ./master/WorkloadOutput/reports-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2022&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;01&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-20T22:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;14&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;41.399424&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;00&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;00&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/connections_buildup/configsvr.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/mongod.log&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 239K ./master/WorkloadOutput/reports-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2022&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;01&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-20T22:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;14&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;41.399424&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;00&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;:&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;00&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/connections_buildup/mongod.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/mongod.log&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 107K ./v4.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/WorkloadOutput/reports-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2022&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;01&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-20T23_24_48.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;228302&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+00_00/connections_buildup/mongod.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;0&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/mongod.log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 73K ./v4.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/WorkloadOutput/reports-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2022&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;01&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-20T23_24_48.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;228302&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+00_00/connections_buildup/mongod.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/mongod.log&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 73K ./v4.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/WorkloadOutput/reports-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2022&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;01&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-20T23_24_48.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;228302&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+00_00/connections_buildup/mongod.&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;/mongod.log&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;$&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;So perhaps ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57230&quot; title=&quot;mongos doesn&amp;#39;t distribute secondary reads evenly on v4.4 or above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57230&quot;&gt;&lt;del&gt;SERVER-57230&lt;/del&gt;&lt;/a&gt;&#160;deserves special attention first.&lt;/p&gt;</comment>
                            <comment id="4310552" author="JIRAUSER1263891" created="Mon, 24 Jan 2022 21:06:10 +0000"  >&lt;p&gt;I&apos;ve tried to reproduce by running evergreen sys-perf projects against &lt;a href=&quot;https://spruce.mongodb.com/version/61e9cd603e8e86072e5ba78d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;master&lt;/a&gt; (currently pointing to 5.3) and &lt;a href=&quot;https://spruce.mongodb.com/version/61e9cf022fbabe10e0a0e5ed&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;4.2&lt;/a&gt; where the initial baseline came from. Interestingly, mongos logs for v4.2 were a fraction of the size. I then scanned through the code base to see where the specific &quot;slow query&quot; log line was getting generated and found it in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/curop.cpp#L406-L517&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. By just following the logic I am not certain what makes a query / operation to be considered slow. From the 215,000 log lines &lt;em&gt;durationMillis&lt;/em&gt;&#160;ranged from 100 to 363.&lt;/p&gt;</comment>
                            <comment id="4303477" author="JIRAUSER1263891" created="Thu, 20 Jan 2022 17:46:05 +0000"  >&lt;p&gt;In my previous update I forgot to mention there is also &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57230&quot; title=&quot;mongos doesn&amp;#39;t distribute secondary reads evenly on v4.4 or above&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57230&quot;&gt;&lt;del&gt;SERVER-57230&lt;/del&gt;&lt;/a&gt;&#160;created out of the same investigation that might overlap this one. It might be wise to understand / fix that problem which is way better defined to then tackle this one.&lt;/p&gt;</comment>
                            <comment id="4303065" author="JIRAUSER1263891" created="Thu, 20 Jan 2022 15:51:23 +0000"  >&lt;p&gt;Met with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tyler.seip&quot; class=&quot;user-hover&quot; rel=&quot;tyler.seip&quot;&gt;tyler.seip&lt;/a&gt;&#160;and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=george.wangensteen&quot; class=&quot;user-hover&quot; rel=&quot;george.wangensteen&quot;&gt;george.wangensteen&lt;/a&gt;&#160;yesterday to discuss everything behind this ticket and in summary there was a &lt;a href=&quot;https://jira.mongodb.org/browse/HELP-22857?focusedCommentId=3745572&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-3745572&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;dramatic increase&lt;/a&gt; in &quot;slow queries&quot; while running the&#160;&lt;em&gt;ConnectionsBuildup&lt;/em&gt;&#160;performance test from version 4.2 to version 4.4. Reasons are inconclusive at this point and but might be related to the introduction of &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/4.4/#preferred-initial-sync-source&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Preferred Initial Sync Source&lt;/a&gt;&#160;or &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/4.4/#hedged-reads&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Hedged Reads&lt;/a&gt;&#160;&lt;/p&gt;

&lt;p&gt;First steps into the investigation are to diff the two branches and check if something obvious is noticed and try to operationally reproduce the issue.&lt;/p&gt;</comment>
                            <comment id="4298365" author="JIRAUSER1263891" created="Tue, 18 Jan 2022 18:10:41 +0000"  >&lt;p&gt;Bringing it to the active sprint per &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=blake.oler&quot; class=&quot;user-hover&quot; rel=&quot;blake.oler&quot;&gt;blake.oler&lt;/a&gt;&apos;s priority suggestion.&lt;/p&gt;</comment>
                            <comment id="3851905" author="JIRAUSER1257743" created="Tue, 1 Jun 2021 17:56:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/HELP-22857?focusedCommentId=3745572&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-3745572&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Other relevant comment&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3845265" author="JIRAUSER1257743" created="Thu, 27 May 2021 16:13:31 +0000"  >&lt;blockquote&gt;&lt;p&gt;I have one more (useful) &lt;a href=&quot;https://evergreen.mongodb.com/version/608ad2a42fbabe675df3272c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;patch&lt;/a&gt;&#160;which reduces the target set in the NITL to one host. It confirms to me beyond a shadow of a doubt that this issue is the NITL and not the RSM:&lt;/p&gt;

&lt;p&gt;&amp;lt;screenshot removed&amp;gt;&lt;/p&gt;

&lt;p&gt;I&apos;d also like to point out that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54278&quot; title=&quot;Add feature flag to disable Opportunistic Reads by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54278&quot;&gt;&lt;del&gt;SERVER-54278&lt;/del&gt;&lt;/a&gt; apparently hit v4.2 only and I believe it is included in the r4.2.13 patch we have here. Thus I think we&apos;re comparing without opportunistic reads to with opportunistic reads. This is still not the effect that opportunistic reads is supposed to generate in practice.&lt;/p&gt;

&lt;p&gt;My general suspicion is that we acquire idle connections and then return them after response faster because they might be executed on the baton starting &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6db26f07a0f4a12a5e410ca42987142f3cb4753d/src/mongo/executor/network_interface_tl.cpp#L816&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. Connections that we do not use are always returned on the reactor. This makes me wonder if it&apos;s worth making a form of ConnectionPool::get() that also takes an executor pointer or a baton. We might be able substantially inline our connection pooling because we&apos;d be inline queuing on the baton that is only processing one operation. On the flip side, we might contend much more for the pool lock.&lt;/p&gt;

&lt;p&gt;I still don&apos;t have a great explanation for the isMaster burst though. Perhaps we are binding late unused connections until the command response arrives in some esoteric way? The full connPoolStats from &lt;a href=&quot;https://github.com/mongodb/mongo/blob/272b9e0bd2425ae15766b198de0f6a1a522bf8d3/src/mongo/executor/connection_pool_stats.cpp#L79-L136&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&#160;might answer this more definitively. We take the forFTDC branch on mongos, so the result is not all that informative right now:&#160;&lt;/p&gt;

&lt;p&gt;&amp;lt;screenshot removed&amp;gt;&lt;/p&gt;

&lt;p&gt;We could run patches with that branch disabled and get a better picture of connections that are not inUse but are either available or refreshing. For instance, we could be trying and failing to refresh connections to d2 for some bad reason.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;from Benjamin Caimano&lt;/p&gt;</comment>
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