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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-60312] [POC] use collMod to change a non-unique index into a unique index</title>
                <link>https://jira.mongodb.org/browse/SERVER-60312</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Investigate the work required to use collMod on a non-unique index to make it unique.&lt;/p&gt;

&lt;p&gt;Considerations:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Should we introduce a &quot;dry-run&quot; mode so that we don&apos;t reinforce uniqueness immediately? This could help return conflicts iteratively.&lt;/li&gt;
	&lt;li&gt;It&apos;s unacceptable for collMod to block all writes to the collection being modified. For unique indexes, we should only have to block incoming inserts that violate the uniqueness constraint.&lt;/li&gt;
	&lt;li&gt;Two phase collMod? First phase: Block new inserts that would violate the uniqueness constraint. Second phase: Actually do an index scan to see if an index is consistent.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1886299">SERVER-60312</key>
            <summary>[POC] use collMod to change a non-unique index into a unique index</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="9">Done</resolution>
                                        <assignee username="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Sep 2021 15:37:11 +0000</created>
                <updated>Mon, 15 Nov 2021 20:53:06 +0000</updated>
                            <resolved>Mon, 15 Nov 2021 20:53:05 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4190160" author="benety.goh" created="Mon, 15 Nov 2021 20:53:06 +0000"  >&lt;p&gt;To be continued in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61486&quot; title=&quot;Investigate work needed to track duplicate key violations before unique index conversion time&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61486&quot;&gt;&lt;del&gt;SERVER-61486&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
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                                        <issuelink>
            <issuekey id="1886319">SERVER-60314</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="520915">SERVER-34263</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1272580">SERVER-46865</issuekey>
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