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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-81037] Cluster the local durable catalog or index it by namespace</title>
                <link>https://jira.mongodb.org/browse/SERVER-81037</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today, the local catalog implements some level of MVCC outside of the storage engine to detect conflicting DDL operations &#8211; e.g. concurrent creations of the same namespace. We should be able to revisit the durable catalog schema to push this responsibility back to the storage engine. This has many benefits: it simplifies the catalog, enables new use cases natively (e.g. support for prepare conflicts), allows for more efficient point-in-time lookups of durable catalog data, and is a step towards a durably consistent catalog between replicas.&lt;br/&gt;
&#160;&lt;br/&gt;
Clustering the catalog with a cluster key on the &quot;ns&quot; field enables collection creation inside prepared transactions (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46105&quot; title=&quot;Allow new collection creation inside prepared transactions.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46105&quot;&gt;SERVER-46105&lt;/a&gt;), which would otherwise require supporting prepared transactions and prepare conflicts above the storage engine.&lt;br/&gt;
An alternative approach would be a unique index on the &quot;ns&quot; field. This is more involved and would entail promoting the catalog to a regular collection, which is a direction we may want to take longer-term.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2441301">SERVER-81037</key>
            <summary>Cluster the local durable catalog or index it by namespace</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="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="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
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                <created>Wed, 13 Sep 2023 16:40:16 +0000</created>
                <updated>Mon, 16 Oct 2023 18:21:32 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5754568" author="josef.ahmad" created="Thu, 5 Oct 2023 07:09:16 +0000"  >&lt;p&gt;This will also make $listCatalog lookups efficient, as filtering by namespace or UUID will happen at the source.&lt;/p&gt;</comment>
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