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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-29926] system.indexes collection should have a UUID when UUIDs are enabled and featureCompatibilityVersion is 3.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-29926</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When I do db.getCollectionInfos() on admin and local, I notice system.indexes appears in the output with no UUID set while other collections in these databases do.&lt;/p&gt;</description>
                <environment></environment>
        <key id="399308">SERVER-29926</key>
            <summary>system.indexes collection should have a UUID when UUIDs are enabled and featureCompatibilityVersion is 3.6</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Jun 2017 16:01:02 +0000</created>
                <updated>Tue, 6 Dec 2022 03:57:43 +0000</updated>
                            <resolved>Fri, 5 Oct 2018 14:05:12 +0000</resolved>
                                                                    <component>MMAPv1</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1614058" author="schwerin" created="Wed, 5 Jul 2017 14:22:09 +0000"  >&lt;p&gt;Makes sense. Acknowledged.&lt;/p&gt;</comment>
                            <comment id="1611051" author="geert.bosch" created="Fri, 30 Jun 2017 02:00:10 +0000"  >&lt;p&gt;Yes, on MMAPV1 there is a Collection object for it, as there is for system.namespaces. When doing a &lt;tt&gt;listCollections&lt;/tt&gt; you see this in the output, you can query against them etc. In particular, i&apos;d like to be able to have the invariant that all Collection objects in 3.6 and on have UUIDs, so we can change &lt;tt&gt;OptionalCollectionUUID&lt;/tt&gt; to &lt;tt&gt;CollectionUUID&lt;/tt&gt;, lock collections by UUID rather than name, etc.&lt;/p&gt;

&lt;p&gt;I&apos;m afraid that if we have two holdout collections on MMAPv1 without UUID that that is going to be a source of trouble. As we&apos;ll have MMAPv1 around until 4.0, and changing it to no longer expose &lt;tt&gt;system.namespaces&lt;/tt&gt; and &lt;tt&gt;system.indexes&lt;/tt&gt; as collections is unlikely to be acceptable, I think the easiest choice is to just give &lt;tt&gt;system.indexes&lt;/tt&gt; a UUID, and make up an ephemeral one for each &lt;tt&gt;system.namespaces&lt;/tt&gt; collection.&lt;/p&gt;</comment>
                            <comment id="1611003" author="schwerin" created="Fri, 30 Jun 2017 00:49:43 +0000"  >&lt;p&gt;Is this really an error? Is system.indexes even a real collection?&lt;/p&gt;</comment>
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            <issuekey id="402764">SERVER-30095</issuekey>
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            <issuekey id="547226">SERVER-35131</issuekey>
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