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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-56169] Do not use fastcount to count DDL coordinators on stepUp</title>
                <link>https://jira.mongodb.org/browse/SERVER-56169</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently &lt;a href=&quot;https://github.com/mongodb/mongo/blob/85df0bf614fc6eb5286ef7c020f00d0ff0fb21d9/src/mongo/db/s/sharding_ddl_coordinator_service.cpp#L113&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we use DBDirectClient::count() to count the coordinators document stored on disk on step-up&lt;/a&gt;. Since we are not using any matching predicate this count will just use collection metadata (indexes) to estimate the number of document.&lt;br/&gt;
As stated also &lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.count/#mongodb-method-db.collection.count&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;by our official doc&lt;/a&gt; this count may be incorrect in case of an unclean shutdown.&lt;/p&gt;

&lt;p&gt;The proposed fix is to use the $count stage instead.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1682836">SERVER-56169</key>
            <summary>Do not use fastcount to count DDL coordinators on stepUp</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="13201">Fixed</resolution>
                                        <assignee username="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1965-Milestone-1</label>
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                <created>Mon, 19 Apr 2021 15:42:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:54:48 +0000</updated>
                            <resolved>Tue, 20 Apr 2021 16:15:44 +0000</resolved>
                                    <version>Backlog</version>
                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3728011" author="xgen-internal-githook" created="Tue, 20 Apr 2021 16:01:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56169&quot; title=&quot;Do not use fastcount to count DDL coordinators on stepUp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56169&quot;&gt;&lt;del&gt;SERVER-56169&lt;/del&gt;&lt;/a&gt; Do not use fastcount to count DDL coordinators on stepUp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f1caa6d2dc2c28b7363990f9965e4d6ae179d7a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f1caa6d2dc2c28b7363990f9965e4d6ae179d7a&lt;/a&gt;&lt;/p&gt;</comment>
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