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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-85290] The catalog::forEachCollectionFromDb helper method should access collection metadata through a consistent readTimestamp</title>
                <link>https://jira.mongodb.org/browse/SERVER-85290</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today, the &lt;tt&gt;catalog::forEachCollectionFromDb()&lt;/tt&gt; iterates through the database collections &lt;a href=&quot;https://github.com/10gen/mongo/blob/37f3f8ed0d373fdc4e9ed35c7fa34712aa3fa2b4/src/mongo/db/catalog/collection_catalog_helper.cpp#L97&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;using&lt;/a&gt; the &lt;tt&gt;lookupNSSByUUID()&lt;/tt&gt; primitive, which does not guarantee alignment between the in-memory catalog cache and the metadata persisted in WiredTiger if ReadConcernArgs is set on the opCtx. This would cause the following scenario to occur:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;We &lt;a href=&quot;https://github.com/10gen/mongo/blob/6606fe48ccfdc456bc0f0d8e0c989886ceffa77a/src/mongo/db/catalog/collection_catalog_helper.cpp#L100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;abandon the snapshot&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;We lock the collection &lt;a href=&quot;https://github.com/10gen/mongo/blob/6606fe48ccfdc456bc0f0d8e0c989886ceffa77a/src/mongo/db/catalog/collection_catalog_helper.cpp#L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;based on the latest CollectionCatalog information&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;We execute the function with a collection that may not exist at the given read concern timestamp but exists at the latest timestamp.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The usage of &lt;tt&gt;establishConsistentCollection/s()&lt;/tt&gt; methods would on the other hand guarantee a more robust behaviour against concurrent creation of new database collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2547568">SERVER-85290</key>
            <summary>The catalog::forEachCollectionFromDb helper method should access collection metadata through a consistent readTimestamp</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 Jan 2024 13:38:07 +0000</created>
                <updated>Thu, 25 Jan 2024 11:07:00 +0000</updated>
                                            <version>7.0.0</version>
                    <version>7.1.0</version>
                    <version>7.3.0-rc0</version>
                    <version>7.2.0</version>
                                                                        <votes>0</votes>
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