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    <title>MongoDB Jira</title>
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    <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-83988] Investigate invariant in CollectionCatalog::write</title>
                <link>https://jira.mongodb.org/browse/SERVER-83988</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2519269">SERVER-83988</key>
            <summary>Investigate invariant in CollectionCatalog::write</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="josef.ahmad@mongodb.com">Josef Ahmad</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Dec 2023 19:07:46 +0000</created>
                <updated>Mon, 11 Dec 2023 09:48:28 +0000</updated>
                            <resolved>Mon, 11 Dec 2023 09:48:28 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5939710" author="josef.ahmad" created="Mon, 11 Dec 2023 09:46:16 +0000"  >&lt;p&gt;This is a 5.0 incarnation of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79982&quot; title=&quot;Batched catalog writers can run concurrently with  HistoricalCatalogIdTracker::cleanup() and lead to incorrect PIT find results.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79982&quot;&gt;&lt;del&gt;SERVER-79982&lt;/del&gt;&lt;/a&gt;, which has been backported to 7.0 only. Callers of CollectionCatalog::write should acquire the global lock in IX mode at a minimum to avoid racing with the batched collection writer. In this failure instance, &lt;a href=&quot;https://github.com/10gen/mongo/blob/r5.0.23/src/mongo/db/commands/set_profiling_filter_globally_cmd.cpp&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;SetProfilingFilterGloballyCmd&lt;/a&gt; doesn&apos;t acquire the lock in 5.0, and that opened the opportunity to interleave with another operation holding the batched collection catalog writer, and eventually &lt;a href=&quot;https://github.com/10gen/mongo/blob/r5.0.23/src/mongo/db/catalog/collection_catalog.cpp#L552-L553&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fail the invariant&lt;/a&gt; that we should be holding the exclusive lock.&lt;/p&gt;

&lt;p&gt;I&apos;m duplicating this ticket behind the &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79982&quot; title=&quot;Batched catalog writers can run concurrently with  HistoricalCatalogIdTracker::cleanup() and lead to incorrect PIT find results.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79982&quot;&gt;&lt;del&gt;SERVER-79982&lt;/del&gt;&lt;/a&gt; backports back to 5.0, which is the version that introduces the batched catalog writer. cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jordi.olivares-provencio%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jordi.olivares-provencio@mongodb.com&quot;&gt;jordi.olivares-provencio@mongodb.com&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;As an additional note, we plan to remove the batched catalog writer via &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81971&quot; title=&quot;Explore removing the BatchedCollectionCatalogWriter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81971&quot;&gt;SERVER-81971&lt;/a&gt;, as the recent adoption of immutable data structures made copying the catalog sub-linear.&lt;/p&gt;</comment>
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