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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-79960] Collection acquisition establishing capped snapshot can miss collection concurrently being created</title>
                <link>https://jira.mongodb.org/browse/SERVER-79960</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When acquiring a collection, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/shard_role.cpp#L872-L896&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;establish a capped snapshot if the collection requires it&lt;/a&gt;. When doing so, we simply &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/shard_role.cpp#L418&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;look up into the collection catalog&lt;/a&gt;. If such a collection is concurrently being created, in the version of the collection catalog we&apos;re using it may have &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/catalog/collection_catalog.cpp#L310-L312&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;been added to &lt;tt&gt;CollectionCatalog::_pendingCommitNamespaces&lt;/tt&gt;&lt;/a&gt; as a part of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/storage/write_unit_of_work.cpp#L150-L152&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the pre-commit hooks&lt;/a&gt;. However it&apos;s possible that we haven&apos;t yet &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/storage/recovery_unit.cpp#L112&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;executed the commit handlers&lt;/a&gt; which come after &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;committing the storage transaction&lt;/a&gt;. This would mean that we haven&apos;t &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/catalog/collection_catalog.cpp#L391&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;registered the collection with the collection catalog&lt;/a&gt; yet; thus the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/shard_role.cpp#L418&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aforementioned lookup in the collection catalog&lt;/a&gt; would not find the collection, and we would (incorrectly) not establish a capped snapshot. Then later in the collection acquisition logic we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/shard_role.cpp#L944&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;establish a consistent collection&lt;/a&gt; which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/catalog/collection_catalog.cpp#L855-L857&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;opens the collection&lt;/a&gt; because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/af78b36812c3ef93a29c1c40e6197ad71e71af92/src/mongo/db/catalog/collection_catalog.cpp#L881&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it is in &lt;tt&gt;CollectionCatalog::_pendingCommitNamespaces&lt;/tt&gt;&lt;/a&gt;. Therefore the end state of this sequence of events is that we have performed a collection acquisition on a collection which uses capped snapshots, without performing the required capped snapshot establishment.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2416410">SERVER-79960</key>
            <summary>Collection acquisition establishing capped snapshot can miss collection concurrently being created</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Sun, 13 Aug 2023 18:29:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:17:39 +0000</updated>
                            <resolved>Fri, 15 Sep 2023 08:12:26 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>7.1.0-rc3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="5707233" author="xgen-internal-githook" created="Fri, 15 Sep 2023 14:29:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79960&quot; title=&quot;Collection acquisition establishing capped snapshot can miss collection concurrently being created&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79960&quot;&gt;&lt;del&gt;SERVER-79960&lt;/del&gt;&lt;/a&gt; Establish empty CappedSnapshot if not established due to concurrent collection creation&lt;br/&gt;
Branch: v7.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/78cb4f7b65bec3b6c565ae8c0f9f94190ba7d24d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/78cb4f7b65bec3b6c565ae8c0f9f94190ba7d24d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5705476" author="xgen-internal-githook" created="Thu, 14 Sep 2023 19:56:12 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79960&quot; title=&quot;Collection acquisition establishing capped snapshot can miss collection concurrently being created&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79960&quot;&gt;&lt;del&gt;SERVER-79960&lt;/del&gt;&lt;/a&gt; Establish empty CappedSnapshot if not established due to concurrent collection creation&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a78a0690d5f2da27dc03e231605a332d2cdf28da&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a78a0690d5f2da27dc03e231605a332d2cdf28da&lt;/a&gt;&lt;/p&gt;</comment>
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