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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-30383] Preserve collection UUID in renameCollection across databases</title>
                <link>https://jira.mongodb.org/browse/SERVER-30383</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently renameCollection across databases:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;takes a global lock&lt;/li&gt;
	&lt;li&gt;copies the data from the source collection to a temporary collection (with a different UUID) in the target database&lt;/li&gt;
	&lt;li&gt;atomically drops the source collection and renames the temp collection in the target db to its final non-temp name in the target db.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We can change this to:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Take a global clock&lt;/li&gt;
	&lt;li&gt;Copy the data from the source collection to a temporary collection (with a different UUID) in the target database&lt;/li&gt;
	&lt;li&gt;Atomically move the source collection to the drop-pending namespace, change its UUUID, rename the temp collection in the target db to its final non-temp name in the target db, and change the UUID on the dest collection to the UUID of the original source collection.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="409358">SERVER-30383</key>
            <summary>Preserve collection UUID in renameCollection across databases</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="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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 Jul 2017 21:00:41 +0000</created>
                <updated>Mon, 31 Jul 2017 14:25:12 +0000</updated>
                            <resolved>Mon, 31 Jul 2017 14:25:12 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1636242" author="ian@10gen.com" created="Mon, 31 Jul 2017 14:25:12 +0000"  >&lt;p&gt;Closing as we&apos;re going with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30371&quot; title=&quot;Separate renameCollection across DB commands into individual oplog entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30371&quot;&gt;&lt;del&gt;SERVER-30371&lt;/del&gt;&lt;/a&gt; instead.&lt;/p&gt;</comment>
                            <comment id="1634071" author="ian@10gen.com" created="Thu, 27 Jul 2017 23:19:11 +0000"  >&lt;p&gt;Hey Spencer, sorry, that was just my default to put anything 3.6 feature related under 3.5 Desired.  Bumping to 3.5 Required now.&lt;/p&gt;</comment>
                            <comment id="1633986" author="spencer" created="Thu, 27 Jul 2017 22:15:20 +0000"  >&lt;p&gt;We&apos;d need to make sure this works with rollback to a checkpoint.  For that to work we&apos;d need to make sure that the source collection is two-phase dropped so that we don&apos;t lose its data from the source database until the drop is replication committed.  For that to work we could just give the source collection a new UUID while it&apos;s in drop-pending mode.  We&apos;d need to record that new UUID in the renameCollection oplog entry (so that the refetch based rollback implementation can undo the renameCollection properly), but recent work already added an extra field for the original collection UUID to the renameCollection oplog entries so we should be able to use that.  The final question is whether the recoverToStableCheckpoint machinery will be able to properly restore the original source collection from it&apos;s drop-pending namespace and uuid to its original namespace and UUID.&lt;/p&gt;</comment>
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            <issuekey id="409115">SERVER-30371</issuekey>
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