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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-43688] Race in range deleter can trigger invariant if epoch changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-43688</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e2875bb82ff99ffb27ccbcd68d596941a427f151/src/mongo/db/s/metadata_manager.cpp#L310-L315&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setFilteringMetadata in the metadata manager&lt;/a&gt;, when a collection&apos;s epoch has changed, triggers &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/metadata_manager.cpp#L230&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;clearing the range deleter&apos;s queue&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;If this happens when the range deleter is executing a task for that collection in between &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9b470eb73873f5db5c9fcee5df5316d477a1fa12/src/mongo/db/s/collection_range_deleter.cpp#L165-L198&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;these lines&lt;/a&gt;, where the range deleter is not holding the metadata manager&apos;s mutex, then the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9b470eb73873f5db5c9fcee5df5316d477a1fa12/src/mongo/db/s/collection_range_deleter.cpp#L342&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant here&lt;/a&gt; will be triggered.&lt;/p&gt;

&lt;p&gt;We should either make this not an invariant or fix the concurrency control between the range deleter and the metadata manager (though the former seems more tractable).&lt;/p&gt;</description>
                <environment></environment>
        <key id="943353">SERVER-43688</key>
            <summary>Race in range deleter can trigger invariant if epoch changes</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 27 Sep 2019 17:01:19 +0000</created>
                <updated>Tue, 6 Dec 2022 02:46:06 +0000</updated>
                            <resolved>Wed, 15 Jan 2020 19:55:41 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2732591" author="matthew.saltz" created="Wed, 15 Jan 2020 19:55:41 +0000"  >&lt;p&gt;Refactoring the range deleter made this a non-issue (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45024&quot; title=&quot;Refactor the CollectionRangeDeleter to remove dependency on MetadataManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45024&quot;&gt;&lt;del&gt;SERVER-45024&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;</comment>
                            <comment id="2594949" author="matthew.saltz" created="Mon, 9 Dec 2019 22:08:15 +0000"  >&lt;p&gt;This will go away once the CollectionRangeDeleter is refactored&lt;/p&gt;</comment>
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