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    <link>https://jira.mongodb.org</link>
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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-53535] Rename with dropTarget must be done atomically in the catalog to prevent a lock free reader to observe intermediate invalid state</title>
                <link>https://jira.mongodb.org/browse/SERVER-53535</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Rename with dropTarget=true is performed in two phases with each phase is writing to the catalog while holding a MODE_X lock for the collection.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/72565dc7c6909fd6f96f5625a9d28c64efed8c9e/src/mongo/db/catalog/rename_collection.cpp#L267-L273&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/72565dc7c6909fd6f96f5625a9d28c64efed8c9e/src/mongo/db/catalog/rename_collection.cpp#L267-L273&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;As holding a MODE_X lock does not prevent a lock free reader it may observe the collection as dropped as this is written to the in-memory catalog separately from the rename:&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/72565dc7c6909fd6f96f5625a9d28c64efed8c9e/src/mongo/db/catalog/database_impl.cpp#L517-L522&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/72565dc7c6909fd6f96f5625a9d28c64efed8c9e/src/mongo/db/catalog/database_impl.cpp#L517-L522&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This whole operation must be performed atomically in a single catalog write as MODE_X lock mode cannot be used to prevent readers anymore.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1578209">SERVER-53535</key>
            <summary>Rename with dropTarget must be done atomically in the catalog to prevent a lock free reader to observe intermediate invalid state</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>Tue, 29 Dec 2020 14:48:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:13 +0000</updated>
                            <resolved>Wed, 6 Jan 2021 15:32:16 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3550554" author="xgen-internal-githook" created="Wed, 6 Jan 2021 15:17:06 +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-53535&quot; title=&quot;Rename with dropTarget must be done atomically in the catalog to prevent a lock free reader to observe intermediate invalid state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53535&quot;&gt;&lt;del&gt;SERVER-53535&lt;/del&gt;&lt;/a&gt; Rename collection with dropTarget=true is written atomically into the catalog.&lt;/p&gt;

&lt;p&gt;Collection drops are now implemented with correct isolation where the catalog is only updated after a successful commit so a lock free reader may not observe intermediate invalid state.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/351af2efd3a0ddcdfc284350ff81d98fedd0a001&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/351af2efd3a0ddcdfc284350ff81d98fedd0a001&lt;/a&gt;&lt;/p&gt;</comment>
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