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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-68872] runAggregate should be refactored so that locking isn&apos;t so confusing</title>
                <link>https://jira.mongodb.org/browse/SERVER-68872</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;My particular angle of motivation on the refactor is from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67424&quot; title=&quot;Seek and destroy open storage cursors saved in the CursorManager across commands on rollback/shutdown (storage engine closure)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67424&quot;&gt;SERVER-67424&lt;/a&gt; wherein I encountered the following problem:&lt;/p&gt;

&lt;p&gt;&quot;It appears that we modify read concern settings (prepared conflict) in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/da1b994b05bba3b15cadd5138fc3dcd3687c7f91/src/mongo/db/pipeline/document_source_writer.h#L55&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DocumentSourceWriter&lt;/a&gt;. The problem with this is that if the high level code has a AutoGetLockFree*, we&apos;ve already got a storage snapshot open: read concern is normally manipulated in the AutoGet* or earlier layers. It works today because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/da1b994b05bba3b15cadd5138fc3dcd3687c7f91/src/mongo/db/commands/run_aggregate.cpp#L657&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we happen not to hold AutoGet* across runAggregate&apos;s use of DocumentSourceWriter&lt;/a&gt;. I was trying to hold locks across this, to hold a lock across registration of CursorManager::registerCursor for concurrency control with replication rollback.&quot;&lt;/p&gt;

&lt;p&gt;Locking uncertainty in runAggregate hinders development: it&apos;s very confusing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2115407">SERVER-68872</key>
            <summary>runAggregate should be refactored so that locking isn&apos;t so confusing</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-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Aug 2022 19:25:48 +0000</created>
                <updated>Mon, 5 Dec 2022 23:50:42 +0000</updated>
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