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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-67815] FindCommand sets both the nss and uuid on NamespaceStringOrUUID</title>
                <link>https://jira.mongodb.org/browse/SERVER-67815</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A NamespaceStringOrUUID object should only ever hold either a NamespaceString object or a DatabaseName + UUID. Previously, this was enforced because the constructors would only take one or the other, and there were no setters. However, a method NamespaceStringOrUUID::setNss() was added in order to override the namespace for find commands, making it possible to set both the nss and uuid/db name fields. This looks to be used in two places in the find command path - one of these places &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0cf9395eb2274290a3787d088ec88d7b1c7c3a77/src/mongo/db/query/query_request_helper.cpp#L145-L147&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sets the nss field when the uuid field is already set&lt;/a&gt;. There are a number of places that the server relies on the fact that only one of the uuid or nss is set on a NamespaceStringOrUUID object. &lt;/p&gt;

&lt;p&gt;I think we should either:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Remove NamespaceStringOrUUID::setNss() and reconstruct a NamespaceStringOrUUID object instead&lt;/li&gt;
	&lt;li&gt;Change NamespaceStringOrUUID::setNss() to also unset the uuid/db name&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2083970">SERVER-67815</key>
            <summary>FindCommand sets both the nss and uuid on NamespaceStringOrUUID</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="13201">Fixed</resolution>
                                        <assignee username="justin.seyster@mongodb.com">Justin Seyster</assignee>
                                    <reporter username="janna.golden@mongodb.com">Janna Golden</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>quick-tech-debt</label>
                    </labels>
                <created>Wed, 6 Jul 2022 17:24:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:58 +0000</updated>
                            <resolved>Mon, 22 May 2023 18:00:13 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5442876" author="matt.broadstone" created="Mon, 22 May 2023 18:00:13 +0000"  >&lt;p&gt;Fixed in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77228&quot; title=&quot;Improve memory layout of NamespaceStringOrUUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77228&quot;&gt;&lt;del&gt;SERVER-77228&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5209866" author="justin.seyster" created="Sat, 18 Feb 2023 06:01:35 +0000"  >&lt;p&gt;Quick update on this: replacing the value in &lt;tt&gt;FindCommandRequest::nssOrUUID&lt;/tt&gt; as originally suggested seems like it should be viable and also improve the code by better enforcing an invariant.&lt;/p&gt;

&lt;p&gt;While testing the change, I encountered a failing jstest that makes me think SBE might be relying on the incorrect behavior of storing both a NamespaceString and UUID. That has the potential to be a bug, so I&apos;m going to continue to investigate at the next opportunity.&lt;/p&gt;</comment>
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