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    <title>MongoDB Jira</title>
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    <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-49843] Stress test building a unique index with a large number of non-unique keys</title>
                <link>https://jira.mongodb.org/browse/SERVER-49843</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48067&quot; title=&quot;Reduce memory consumption for unique index builds with large numbers of non-unique keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48067&quot;&gt;&lt;del&gt;SERVER-48067&lt;/del&gt;&lt;/a&gt;, I measured performance by building a unique index on a standalone on a field that was identical in 2 million documents. One of the times I ran this build, it hit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6e554668a820530cdf79360e4be1851e4cde2905/src/mongo/db/index_builds_coordinator.cpp#L2140-L2145&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt; with a WriteConflict. The exception appears to have occurred sometime after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6e554668a820530cdf79360e4be1851e4cde2905/src/mongo/db/index/index_access_method.cpp#L701-L708&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;inserting keys from the external sorted into the index&lt;/a&gt;, which was the last log message printed before the invariant was hit (with default log verbosity). Having a stress test here (probably either a standard jstest or an FSM jstest) will hopefully help reproduce this and identify where the WriteConflict escaped from. Note that I specified &quot;a unique index with a large number of non-unique keys&quot; in the title since that&apos;s the scenario I ran into this issue with, but it could be unrelated to this specific configuration.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1418493">SERVER-49843</key>
            <summary>Stress test building a unique index with a large number of non-unique keys</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="brian.deleonardis@mongodb.com">Brian DeLeonardis</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                            <label>newgrad</label>
                    </labels>
                <created>Thu, 23 Jul 2020 18:16:43 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:20 +0000</updated>
                            <resolved>Fri, 30 Oct 2020 20:25:52 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3470196" author="xgen-internal-githook" created="Fri, 30 Oct 2020 20:24:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Brian DeLeonardis&apos;, &apos;email&apos;: &apos;brian.deleonardis@mongodb.com&apos;, &apos;username&apos;: &apos;bdeleonardis1&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49843&quot; title=&quot;Stress test building a unique index with a large number of non-unique keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49843&quot;&gt;&lt;del&gt;SERVER-49843&lt;/del&gt;&lt;/a&gt; Stress test unique index builds&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4fba6de9eb1dea5895845cc06bd206f7b0ea3cf3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4fba6de9eb1dea5895845cc06bd206f7b0ea3cf3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3468395" author="brian.deleonardis" created="Thu, 29 Oct 2020 18:05:34 +0000"  >&lt;p&gt;Code review: &lt;a href=&quot;https://mongodbcr.appspot.com/696960001/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://mongodbcr.appspot.com/696960001/&lt;/a&gt;&lt;/p&gt;</comment>
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