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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>
    </build-info>


<item>
            <title>[SERVER-53853] Large buildup of mongos to mongod connections and low performance with secondaryPreferred reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-53853</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Test consists of 500 threads doing secondaryPreferred reads as fast as possible against a single shard cluster. In the chart below the queries before A are from the primary for reference, after A are secondaryPreferred.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/295769/295769_conns.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;As expected, there are 500 connections to mongos, so there are as many as 500 outstanding operations.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Before A when reading from the primary (node 0) connections from mongos to mongod build to about 300, and the pool totalInUse and mongod active connections metrics are at times in the hundreds, justifying the need for 300 connections.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;But after A when doing secondary reads connections from mongos to mongod build steadily up to about 10 k connections, far more than the 500 possible outstanding operations. Most of those are considered &quot;in use&quot; by mongos, but very few are &quot;active&quot; in mongod.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;After reaching about 10 k connections the mongos seems to reset and begin building connections again, either to the same or a different secondary.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Slow query logs from mongos record a large number of operations taking tens of milliseconds, but almost non on mongod. The latency metrics from mongod confirm that there is no performance bottleneck on mongod.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;Query throughput after A when doing secondary reads is much less than the primary reads before A. This seems to get worse as the number of connections build, but the latency on mongod remains low, so this is probably not due to an issue on mongod with the number of connections, but rather some issue in mongos.&lt;/li&gt;
&lt;/ul&gt;

</description>
                <environment></environment>
        <key id="1592884">SERVER-53853</key>
            <summary>Large buildup of mongos to mongod connections and low performance with secondaryPreferred reads</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="13203">Gone away</resolution>
                                        <assignee username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Sat, 16 Jan 2021 16:46:21 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:16 +0000</updated>
                            <resolved>Mon, 30 Oct 2023 16:34:06 +0000</resolved>
                                    <version>4.2.0</version>
                    <version>4.2.11</version>
                                                                        <votes>2</votes>
                                    <watches>30</watches>
                                                                                                                <comments>
                            <comment id="3736619" author="JIRAUSER1254107" created="Fri, 23 Apr 2021 20:27:28 +0000"  >&lt;p&gt;We believe this issue was addressed with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54278&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-54278&lt;/a&gt;. Thanks everyone!&#160;&lt;/p&gt;</comment>
                            <comment id="3573544" author="bruce.lucas@10gen.com" created="Wed, 20 Jan 2021 15:23:46 +0000"  >&lt;p&gt;There&apos;s another report&#160;in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53899&quot; title=&quot;TaskExecutor CPU fills up instantly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53899&quot;&gt;&lt;del&gt;SERVER-53899&lt;/del&gt;&lt;/a&gt; that may be impacted by this issue.&lt;/p&gt;</comment>
                            <comment id="3570846" author="bruce.lucas@10gen.com" created="Tue, 19 Jan 2021 13:50:05 +0000"  >&lt;p&gt;This issue affects 4.2.0 and 4.2.11, but does not seem to affect 4.0.22 nor 4.4.3.&lt;/p&gt;</comment>
                            <comment id="3569170" author="bruce.lucas@10gen.com" created="Sun, 17 Jan 2021 13:55:25 +0000"  >&lt;p&gt;While doing some more experiments I found that this issue does not always occur - sometimes the secondary reads are evenly distributed between the secondaries and no buildup of connections occurs. I guess this is the expected behavior? However it seemed to reproduce reliably when running the above (both mongo client and single-shard cluster) all on a single desktop machine with 24 cpus.&lt;/p&gt;

&lt;p&gt;Also noticed the following:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/295805/295805_odd.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;During the period A-B for example&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;As noted previously all queries are routed to secondary member 1, and a buildup of connections occurs on that node (although as mentioned above these connections were marked in-use on mongos but were not active on mongod, and there&apos;s no reason for 10 k connections to service at most 500 concurrent requests).&lt;/li&gt;
	&lt;li&gt;No connections are created to secondary member 2 nor are queries routed there, but nevertheless there is a high volume of ismaster commands on member 2, about one per query, which seems unusual to me.&lt;/li&gt;
&lt;/ul&gt;
</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="1594651">SERVER-53899</issuekey>
        </issuelink>
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                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="1611402">SERVER-54278</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                                        </inwardlinks>
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                            <attachment id="296402" name="connection-pool.png" size="230303" author="amirsaman.memaripour@mongodb.com" created="Thu, 21 Jan 2021 02:09:12 +0000"/>
                            <attachment id="296398" name="connections.png" size="344176" author="amirsaman.memaripour@mongodb.com" created="Thu, 21 Jan 2021 01:48:39 +0000"/>
                            <attachment id="295769" name="conns.png" size="272629" author="bruce.lucas@mongodb.com" created="Sat, 16 Jan 2021 16:45:37 +0000"/>
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                            <attachment id="296395" name="mongos-targeting.png" size="197155" author="amirsaman.memaripour@mongodb.com" created="Thu, 21 Jan 2021 01:30:11 +0000"/>
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                            <attachment id="295770" name="x-conns.tgz" size="1355104" author="bruce.lucas@mongodb.com" created="Sat, 16 Jan 2021 16:50:25 +0000"/>
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&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;function repro() {&lt;/span&gt;&lt;/pre&gt;
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						&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;&amp;nbsp;&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;    nthreads = 500&lt;/span&gt;&lt;/pre&gt;
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						&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;        threads[t].join()&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;&amp;nbsp;&lt;/pre&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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