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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32727] disallow unique indexes on capped collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-32727</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It does not really make sense to create a capped collection with additional constraints such as having unique indexes. In a replica set, capped collections are trimmed on a per-insert basis on every node and this may cause issues enforcing the unique index constraints as inserts are replicated from the primary to secondary nodes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="483556">SERVER-32727</key>
            <summary>disallow unique indexes on capped collections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="benety.goh@mongodb.com">Benety Goh</reporter>
                        <labels>
                            <label>rbfz</label>
                    </labels>
                <created>Tue, 16 Jan 2018 20:04:30 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:41 +0000</updated>
                            <resolved>Mon, 9 Nov 2020 19:57:27 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4333467" author="daniel.gottlieb@10gen.com" created="Thu, 3 Feb 2022 16:03:58 +0000"  >&lt;p&gt;For posterity, now that capped collections explicitly replicate deletes, we believe unique indexes will work as intended for capped collections.&lt;/p&gt;</comment>
                            <comment id="1778995" author="ian@10gen.com" created="Fri, 19 Jan 2018 15:09:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn&quot;&gt;max.hirschhorn&lt;/a&gt; we&apos;re not going to be able to fix this issue in capped collections and the larger fix is a while off.  How would you like to fix this failure in the fuzzer?&lt;/p&gt;</comment>
                            <comment id="1777918" author="benety.goh" created="Thu, 18 Jan 2018 16:48:50 +0000"  >&lt;p&gt;cloneCollectionAsCapped and convertToCapped are not affected by this issue because we do not recreate the indexes in the original collection:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/convertToCapped/#dbcmd.convertToCapped&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/command/convertToCapped/#dbcmd.convertToCapped&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;(convertToCapped calls cloneCollectionAsCapped internally)&lt;/p&gt;</comment>
                            <comment id="1777818" author="benety.goh" created="Thu, 18 Jan 2018 15:37:38 +0000"  >&lt;p&gt;Besides createIndexes, we should also reject cloneCollectionAsCapped and convertToCapped requests on collections that contain unique indexes. Not sure about upgrade scenarios. &lt;/p&gt;</comment>
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