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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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            <title>[SERVER-41058] Add concurrency workload targeted at multikey index writes</title>
                <link>https://jira.mongodb.org/browse/SERVER-41058</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;multikey indexes have been a frequent cause of bugs in recent releases. Adding concurrency tests that set indexes to multikey more frequently would help weed out bugs here. Doing this concurrently with transactions would also potentially be helpful.&lt;/p&gt;</description>
                <environment></environment>
        <key id="760762">SERVER-41058</key>
            <summary>Add concurrency workload targeted at multikey index writes</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                            <label>newgrad</label>
                    </labels>
                <created>Wed, 8 May 2019 18:51:38 +0000</created>
                <updated>Tue, 6 Dec 2022 02:59:56 +0000</updated>
                                                                            <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2245744" author="judah.schvimer" created="Tue, 14 May 2019 13:25:42 +0000"  >&lt;p&gt;I think both are interesting, but I&apos;m more interested on maintenance on insert, especially when it occurs in parallel.&lt;/p&gt;</comment>
                            <comment id="2245028" author="max.hirschhorn@10gen.com" created="Mon, 13 May 2019 19:59:04 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e4b13ae68a4eef9393357038f09f14bfd8102050/jstests/concurrency/fsm_workloads/indexed_insert_multikey.js#L22-L24&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The &lt;tt&gt;indexed_insert_multikey.js&lt;/tt&gt; FSM workload inserts an array value for the &quot;x&quot; field&lt;/a&gt;, which causes the index to become multikey. If we&apos;re interested in stressing the index becoming multikey, then we may be able to get away with having a new FSM workload which just repeatedly drops and re-creates an index.&lt;/p&gt;

&lt;p&gt;My question would be whether we&apos;d rather have a new FSM workload which &quot;slowly&quot; fills in all of the indexed paths as being multikey. That is to say, has we historically had issues around the maintenance of multikey information on insert, on index creation, or does it not matter?&lt;/p&gt;</comment>
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            <issuekey id="1759632">SERVER-57268</issuekey>
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