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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-51391] Enable lock free reads for aggregation</title>
                <link>https://jira.mongodb.org/browse/SERVER-51391</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This requires some additional ViewCatalog utilities to support lock free reads.&lt;/p&gt;

&lt;p&gt;The aggregation code independently of the AutoGetCollectionForRead* helper fetches the ViewCatalog and does lookup() and resolveView() several times. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/75eb9e18187b7853ed8e317825a2e282a54f92f0/src/mongo/db/commands/run_aggregate.cpp#L299-L301&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;For example&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We need to verify that the ViewCatalog is safe to access multiple times. Perhaps the AutoGetCollectionForRead* helper should save a shared_ptr&amp;lt;ViewCatalog&amp;gt; instance. Accessing the ViewCatalog multiple times across time may not be an inconsistency issue of concern (needs investigation). Alternatively again, maybe a new function on ViewCatalog, like ViewCatalog::getLockFreeState() that will fetch both ViewDefinition and ResolvedView all at once. May need new DatabaseHolder passthrough functions that take dbName and fetch a corresponding Database instance and access the ViewCatalog under an internal mutex&apos;s protection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1503794">SERVER-51391</key>
            <summary>Enable lock free reads for aggregation</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="3">Duplicate</resolution>
                                        <assignee username="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Oct 2020 16:02:52 +0000</created>
                <updated>Wed, 21 Oct 2020 15:01:05 +0000</updated>
                            <resolved>Wed, 21 Oct 2020 15:01:05 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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