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    <description>This file is an XML representation of an issue</description>
    <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-53861] Implement stop migrations procedure for DDL operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-53861</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Some DDL operations (drop collection, drop database, rename etc...) needs to freeze migrations in order to get a stable snapshot of all the shards that own chunks for a specific collection. Disabling the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/catalog/type_collection.h#L88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;allowMigrations flag&lt;/a&gt;, is not enough, in fact when a DDL coordinator starts and you write the {allowMigrations:false}&lt;br/&gt;
 flag on the config server, you could still have migration going from OldShard&lt;br/&gt;
 -&amp;gt; NewShard. This migration definitely will fail to commit and NewShard won&apos;t&lt;br/&gt;
 own any chunks, but NewShard will contain some garbage.&lt;/p&gt;

&lt;p&gt;The following procedure will allow to safely prevent future migration to start and stop current ongoing migrations:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Begin Transaction&lt;/li&gt;
	&lt;li&gt;Set {allowMigrations:false}&lt;/li&gt;
	&lt;li&gt;For one shard owning chunks, set shardVersion = collectionVersion + 1;&lt;/li&gt;
	&lt;li&gt;Commit Transaction&lt;/li&gt;
	&lt;li&gt;For each shard owning chunks: Refresh up to the new shardVersion from 3&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="1593235">SERVER-53861</key>
            <summary>Implement stop migrations procedure for DDL operations</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="13201">Fixed</resolution>
                                        <assignee username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1965-Milestone-0</label>
                            <label>sharding-csrs-stepdown-also</label>
                    </labels>
                <created>Mon, 18 Jan 2021 12:19:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:42 +0000</updated>
                            <resolved>Thu, 25 Feb 2021 09:14:51 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3634478" author="xgen-internal-githook" created="Thu, 25 Feb 2021 08:49:29 +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-53861&quot; title=&quot;Implement stop migrations procedure for DDL operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53861&quot;&gt;&lt;del&gt;SERVER-53861&lt;/del&gt;&lt;/a&gt;: Implement stop migrations procedure for DDL operations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1d3c1ca0ddb2c984ca66381cc39565cbec01c645&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1d3c1ca0ddb2c984ca66381cc39565cbec01c645&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1625351">SERVER-54583</issuekey>
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            <issuekey id="1685606">SERVER-56227</issuekey>
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