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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-83791] Rename collection should track collections in fcv upgrade</title>
                <link>https://jira.mongodb.org/browse/SERVER-83791</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Suppose we&apos;re upgrading a cluster from 7.0 or 7.3 to 8.0. During the process, the collections present in the shard&apos;s local catalog will be registered by launching a &lt;tt&gt;CreateCollectionCoordinator&lt;/tt&gt; as described in the project design, however, if a rename interleaves the process, it might end up leaving a collection in a shard that is not registerd in the config server. The situation is the following:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;In 7.0 (or 7.3) we create &lt;tt&gt;db.coll1&lt;/tt&gt; and &lt;tt&gt;db.coll2&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;We upgrade the binaries, and run &lt;tt&gt;setFeatureCompatibilityVersion: &apos;8.0&apos;&lt;/tt&gt;, which launches &lt;tt&gt;CreateCollectionCoordinators&lt;/tt&gt; for &lt;tt&gt;db.coll1&lt;/tt&gt; and &lt;tt&gt;db.coll2&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;After registering &lt;tt&gt;db.coll1&lt;/tt&gt; a rename from &lt;tt&gt;db.coll1&lt;/tt&gt; to &lt;tt&gt;db.coll2&lt;/tt&gt; sneaks in, removing the metadata of &lt;tt&gt;db.coll1&lt;/tt&gt;, and leaving just &lt;tt&gt;db.coll2&lt;/tt&gt; in the local catalog.&lt;/li&gt;
	&lt;li&gt;The coordinator finds that there is no &lt;tt&gt;db.coll2&lt;/tt&gt; so it becomes a no-op&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This situation can be seen in the attached patch, considering the changes of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79159&quot; title=&quot;Track unsharded collections on upgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79159&quot;&gt;SERVER-79159&lt;/a&gt;. We should change the rename collection to also register the destination shard if we&apos;re in the upgrading process.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2514174">SERVER-83791</key>
            <summary>Rename collection should track collections in fcv upgrade</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                            <label>PM-3364-Milestone-5</label>
                    </labels>
                <created>Fri, 1 Dec 2023 16:35:06 +0000</created>
                <updated>Wed, 7 Feb 2024 11:25:17 +0000</updated>
                                                                            <component>Sharding</component>
                                        <votes>0</votes>
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