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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-62332] RefineCollectionShardKeyCoordinator doesn&apos;t disallow migrations while it&apos;s executing</title>
                <link>https://jira.mongodb.org/browse/SERVER-62332</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The operation of refining a collection&apos;s shard key changes the epoch of a collection and because of this it is not safe to run concurrently with move/split/merge. The current way that this synchronisation is happening is through the dist lock.&lt;/p&gt;

&lt;p&gt;Prior to the introduction of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9ec1e6e58e94d52d2f6a9bc167ff939118aa5134/src/mongo/db/s/balancer/balancer_commands_scheduler_impl.cpp#L164&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;BalancerCommandsScheduler&lt;/tt&gt;&lt;/a&gt; utility, the dist locks held by the balancer (on behalf of moveChunk) were being recovered when the config server was in drain mode. This meant that on step-down/step-up, it wasn&apos;t possible that another operation could sneak-in and take the dist lock from underneath chunk migration. However, now this recovery is happening outside of drain mode and because of this we can have refine and moveChunk running concurrently.&lt;/p&gt;

&lt;p&gt;Instead of fixing the &lt;tt&gt;BalancerCommandsScheduler&lt;/tt&gt;&apos;s recovery, we should move forward in the direction of getting rid of the dist lock and should just make the RefineCollectionShardKeyCoordinator disallow migrations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1957688">SERVER-62332</key>
            <summary>RefineCollectionShardKeyCoordinator doesn&apos;t disallow migrations while it&apos;s executing</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Sun, 2 Jan 2022 08:58:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:34 +0000</updated>
                            <resolved>Fri, 21 Jan 2022 09:19:15 +0000</resolved>
                                    <version>5.2.0</version>
                    <version>5.1.0</version>
                                    <fixVersion>5.3.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4305037" author="xgen-internal-githook" created="Fri, 21 Jan 2022 09:05:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62332&quot; title=&quot;RefineCollectionShardKeyCoordinator doesn&amp;#39;t disallow migrations while it&amp;#39;s executing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62332&quot;&gt;&lt;del&gt;SERVER-62332&lt;/del&gt;&lt;/a&gt; Make RefineCollectionShardKeyCoordinator disallow migrations while it&apos;s executing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0527f6a2d024a0b0b6ac6706dc82820c405dad9d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0527f6a2d024a0b0b6ac6706dc82820c405dad9d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1934459">SERVER-61755</issuekey>
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            <issuekey id="1968161">SERVER-62849</issuekey>
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