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    <title>MongoDB Jira</title>
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    <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-66462] Change stream pre-image write performance degrades under certain conditions</title>
                <link>https://jira.mongodb.org/browse/SERVER-66462</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Update/delete operation throughput can severely (&amp;gt;10x) decrease when the change stream pre-images are enabled and more than one collection with change stream pre-images enabled is/has been active in terms of updates/deletes performed.&#160;&lt;br/&gt;
The problem manifests almost always in throughput/latency change stream with pre-images tests. The impact can be seen on the second and subsequent test runs within a task. There is some randomness aspect caused by random assignment of unique ids to collections. The test sample in which the problem manifests: &lt;a href=&quot;https://evergreen.mongodb.com/task/sys_perf_linux_shard_lite_all_feature_flags_change_streams_preimage_latency_c7c2fe1556b7eea593a0a4308a2c068c1eba9c44_22_04_14_16_38_27&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;15_whenAvailablefdbc_preImage_1c_avg_latency.&lt;/a&gt;&lt;br/&gt;
&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2046480">SERVER-66462</key>
            <summary>Change stream pre-image write performance degrades under certain conditions</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="13201">Fixed</resolution>
                                        <assignee username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</assignee>
                                    <reporter username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 May 2022 11:58:08 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:15 +0000</updated>
                            <resolved>Thu, 23 Jun 2022 11:20:19 +0000</resolved>
                                    <version>6.0.0-rc5</version>
                                    <fixVersion>6.0.0-rc11</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4636764" author="xgen-internal-githook" created="Thu, 23 Jun 2022 21:17:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66462&quot; title=&quot;Change stream pre-image write performance degrades under certain conditions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66462&quot;&gt;&lt;del&gt;SERVER-66462&lt;/del&gt;&lt;/a&gt; Fixed change stream pre-image write performance issue&lt;br/&gt;
Branch: davish/&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63099&quot; title=&quot;Constant folding should not assume arithmetic is associative or commutative in the general case&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63099&quot;&gt;&lt;del&gt;SERVER-63099&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/043545f8259aa5c0a4c2fc318ec889d96e54f1ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/043545f8259aa5c0a4c2fc318ec889d96e54f1ea&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4635769" author="xgen-internal-githook" created="Thu, 23 Jun 2022 16:36:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66462&quot; title=&quot;Change stream pre-image write performance degrades under certain conditions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66462&quot;&gt;&lt;del&gt;SERVER-66462&lt;/del&gt;&lt;/a&gt; Fixed change stream pre-image write performance issue&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 043545f8259aa5c0a4c2fc318ec889d96e54f1ea)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/47da65ec2bb4048ce14176bcbb7ac646021fa97f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/47da65ec2bb4048ce14176bcbb7ac646021fa97f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4634753" author="xgen-internal-githook" created="Thu, 23 Jun 2022 11:12:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66462&quot; title=&quot;Change stream pre-image write performance degrades under certain conditions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66462&quot;&gt;&lt;del&gt;SERVER-66462&lt;/del&gt;&lt;/a&gt; Fixed change stream pre-image write performance issue&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/043545f8259aa5c0a4c2fc318ec889d96e54f1ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/043545f8259aa5c0a4c2fc318ec889d96e54f1ea&lt;/a&gt;&lt;/p&gt;</comment>
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