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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-52556] Make multiple lookups within a snapshot from the CollectionCatalog consistent </title>
                <link>https://jira.mongodb.org/browse/SERVER-52556</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implement copy-on-write on the CollectionCatalog. Where its data structures that contain shared pointers are copied.&lt;/p&gt;

&lt;p&gt;The new catalog instance should be able to be installed with atomic compare-and-swap and we can remove the catalog mutex that is currently there.&lt;/p&gt;

&lt;p&gt;Lock-Free read operations hold a shared_ptr to a CollectionCatalog consistent with the established storage snapshot and may perform multiple lookups from this instance that all is consistent with the storage snapshot.&lt;/p&gt;

&lt;p&gt;This should allow us to support DBDirectClient in Lock-Free Reads.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1531342">SERVER-52556</key>
            <summary>Make multiple lookups within a snapshot from the CollectionCatalog consistent </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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 2 Nov 2020 14:10:42 +0000</created>
                <updated>Mon, 29 Jan 2024 17:32:15 +0000</updated>
                            <resolved>Fri, 13 Nov 2020 20:16:36 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3490435" author="xgen-internal-githook" created="Fri, 13 Nov 2020 23:57:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52556&quot; title=&quot;Make multiple lookups within a snapshot from the CollectionCatalog consistent &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52556&quot;&gt;&lt;del&gt;SERVER-52556&lt;/del&gt;&lt;/a&gt; Remove faulty catalog iterator test. This is no longer safe.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ae1f02be485b9ecc4e43e757baf54c70dcf07ed1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ae1f02be485b9ecc4e43e757baf54c70dcf07ed1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3490060" author="xgen-internal-githook" created="Fri, 13 Nov 2020 20:15:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52556&quot; title=&quot;Make multiple lookups within a snapshot from the CollectionCatalog consistent &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52556&quot;&gt;&lt;del&gt;SERVER-52556&lt;/del&gt;&lt;/a&gt; Versioned CollectionCatalog. Writes are performed using copy-on-write.&lt;/p&gt;

&lt;p&gt;Internal mutexes when reading CollectionCatalog are removed, just one mutex for writes are needed.&lt;br/&gt;
Lock-free reads helper AutoGetCollectionForReadLockFree stashes a CollectionCatalog consistent with snapshot on OperationContext&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8f9823f644d0b6beba8a301866141a578d278534&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8f9823f644d0b6beba8a301866141a578d278534&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3490059" author="xgen-internal-githook" created="Fri, 13 Nov 2020 20:15:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52556&quot; title=&quot;Make multiple lookups within a snapshot from the CollectionCatalog consistent &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52556&quot;&gt;&lt;del&gt;SERVER-52556&lt;/del&gt;&lt;/a&gt; Versioned CollectionCatalog, interface updates.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/74922687a6a75ea972b6038e1494b4b35a07378e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/74922687a6a75ea972b6038e1494b4b35a07378e&lt;/a&gt;&lt;/p&gt;</comment>
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