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    <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-81297] Simplify CollectionIndexUsageTracker</title>
                <link>https://jira.mongodb.org/browse/SERVER-81297</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The CollectionIndexUsageTracker is using the shared decorations on Collection instances while implementing its own versioning mechanism. This leads to overly complicated code and a less robust versioning system that needs to rely on rollback handlers and handling inconsistent state.&lt;/p&gt;

&lt;p&gt;We should be able to piggyback on the existing Collection versioning system to simplify this class and index add/removal by getting rid of unnecessary rollback handlers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2447970">SERVER-81297</key>
            <summary>Simplify CollectionIndexUsageTracker</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="13201">Fixed</resolution>
                                        <assignee username="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 21 Sep 2023 13:35:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:05 +0000</updated>
                            <resolved>Wed, 11 Oct 2023 14:08:21 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5768872" author="xgen-internal-githook" created="Tue, 10 Oct 2023 19:51:17 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81297&quot; title=&quot;Simplify CollectionIndexUsageTracker&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81297&quot;&gt;&lt;del&gt;SERVER-81297&lt;/del&gt;&lt;/a&gt; Simplify CollectionIndexUsageTracker concurrency model&lt;/p&gt;

&lt;p&gt;The CollectionIndexUsageTracker now relies on the Collection-type copy-on-write machinery to implement its own copy-on-write. This makes it much easier to keep the CollectionIndexUsageTracker in sync with the Collection without the need for explicit rollback handlers.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6d25079a01e5fd3667070d0d53bc20a67d6f9e1f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6d25079a01e5fd3667070d0d53bc20a67d6f9e1f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2341120">SERVER-77131</issuekey>
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