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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31909] Recipient shard should fail migration if it already has the collection with a different UUID</title>
                <link>https://jira.mongodb.org/browse/SERVER-31909</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a recipient shard has an entry for the collection, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/18d5b0cea7558f88bbd5dcbec2a762b51cb13c98/src/mongo/db/s/migration_destination_manager.cpp#L525&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does not ask the donor for the UUID&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;So, it can accept a chunk from a different incarnation of the collection, resulting in a UUID inconsistency between the sharding catalog and the collection on the recipient shard.&lt;/p&gt;

&lt;p&gt;This garbage state from a previous incarnation of a collection can exist on a recipient for a variety of reasons, such as:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;a movePrimary failed after updating the sharding catalog but before dropping the collection from the old primary&lt;/li&gt;
	&lt;li&gt;orphaned chunks from the previous collection still exist&lt;/li&gt;
	&lt;li&gt;a user manually created the collection directly on the shard&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="457103">SERVER-31909</key>
            <summary>Recipient shard should fail migration if it already has the collection with a different UUID</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="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Nov 2017 16:00:00 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:38 +0000</updated>
                            <resolved>Tue, 21 Nov 2017 17:02:38 +0000</resolved>
                                    <version>3.6.0-rc3</version>
                                    <fixVersion>3.6.0-rc5</fixVersion>
                    <fixVersion>3.7.1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1731775" author="xgen-internal-githook" created="Tue, 21 Nov 2017 17:02:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;, &apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31909&quot; title=&quot;Recipient shard should fail migration if it already has the collection with a different UUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31909&quot;&gt;&lt;del&gt;SERVER-31909&lt;/del&gt;&lt;/a&gt; Recipient shard should fail migration if it already has the collection with a different UUID&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 545c11242d737bf1a8ec19c2f2d7a7f14cc08f46)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/db79fdfb42475212dcc902a00420bf693b980d17&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/db79fdfb42475212dcc902a00420bf693b980d17&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1731745" author="xgen-internal-githook" created="Tue, 21 Nov 2017 16:47:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;, &apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31909&quot; title=&quot;Recipient shard should fail migration if it already has the collection with a different UUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31909&quot;&gt;&lt;del&gt;SERVER-31909&lt;/del&gt;&lt;/a&gt; Recipient shard should fail migration if it already has the collection with a different UUID&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/545c11242d737bf1a8ec19c2f2d7a7f14cc08f46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/545c11242d737bf1a8ec19c2f2d7a7f14cc08f46&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1723331" author="schwerin" created="Sat, 11 Nov 2017 15:52:05 +0000"  >&lt;p&gt;Users shouldn&apos;t manually create collections on the individual shards. If they did that in 3.4, and the names collided, they&apos;d just end up with data corruption as data from the&quot;local&quot; version of the collection that overlapped the owned chunks of the sharded collection got overwritten.&lt;/p&gt;</comment>
                            <comment id="1722744" author="esha.maharishi@10gen.com" created="Fri, 10 Nov 2017 17:13:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, do we want to do that, rather than fail migrations to that shard, log warnings, and make the user manually clean up?&lt;/p&gt;

&lt;p&gt;I say this mainly for the last case I described, &quot;a user manually created the collection directly on the shard.&quot; Do we want to automatically wipe out their data, or let them figure out what to do?&lt;/p&gt;</comment>
                            <comment id="1722697" author="schwerin" created="Fri, 10 Nov 2017 16:39:49 +0000"  >&lt;p&gt;Shouldn&apos;t the recipient shard destroy the old version of the collection in its possession, rather than fail the migration?&lt;/p&gt;</comment>
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