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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-68779] Remove full namespace from range deletion task documents (only leave db)</title>
                <link>https://jira.mongodb.org/browse/SERVER-68779</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67778&quot; title=&quot;Lock collection via UUID rather than namespace in the range-deleter &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67778&quot;&gt;&lt;del&gt;SERVER-67778&lt;/del&gt;&lt;/a&gt;, the range deletion code was changed to delete documents by getting a collection via `db + collection UUID` rather than simply using the namespace (that was not allowing to differentiate between different incarnations of the same collection - relying on workarounds to ensure correctness).&lt;/p&gt;

&lt;p&gt;Purpose of this ticket is to start storing only the database name rather than &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/range_deletion_task.idl#L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the nss field&lt;/a&gt;: it is needed to keep at least the db name in the document because it&apos;s not possible to identify a collection only via UUID (either full namespace, either db name + collection UUID).&lt;/p&gt;

&lt;p&gt;The change would have some implications on downgrade/upgrade.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;On upgrade
	&lt;ul&gt;
		&lt;li&gt;Drain and block DDLs (rename might commit entries in the old format)&lt;/li&gt;
		&lt;li&gt;Hold the scoped range deleter lock&lt;/li&gt;
		&lt;li&gt;Update &lt;tt&gt;nss&lt;/tt&gt; to only keep the db name&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;On downgrade
	&lt;ul&gt;
		&lt;li&gt;Drain and block DDLs (rename might commit entries in the new format)&lt;/li&gt;
		&lt;li&gt;Hold the scoped range deleter lock&lt;/li&gt;
		&lt;li&gt;Update &lt;tt&gt;nss&lt;/tt&gt; to include again the full collection name&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;Alternative (&lt;b&gt;more simple&lt;/b&gt;):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Start writing a &quot;dbName&quot; field to new range deletion documents in 8.x&lt;/li&gt;
	&lt;li&gt;On upgrade to v8.0, add &quot;dbName&quot; to all documents coming from the past not containing it&lt;/li&gt;
	&lt;li&gt;On upgrade to v8.1 remove the unused &quot;nss&quot; field from range deletion docs (and re-add it on downgrade)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2112258">SERVER-68779</key>
            <summary>Remove full namespace from range deletion task documents (only leave db)</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>pm-2849-optimizations</label>
                            <label>range-deleter-cleanup</label>
                    </labels>
                <created>Fri, 12 Aug 2022 08:58:31 +0000</created>
                <updated>Tue, 6 Feb 2024 14:00:21 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2140124">SERVER-69792</issuekey>
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