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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-74097] Sharded find with expected collection UUID does not handle all cases of concurrent DDL operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-74097</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When running a &lt;tt&gt;find&lt;/tt&gt; command on a sharded collection with &lt;tt&gt;collectionUUID&lt;/tt&gt; parameter, there is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9325d0f2ab919ddc95c9aa1262c1b02d6e005a47/src/mongo/s/query/cluster_find.cpp#L347-L357&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;some special logic&lt;/a&gt; in the case where we don&apos;t target the primary shard but got a &lt;tt&gt;CollectionUUIDMismatch&lt;/tt&gt; error without an &lt;tt&gt;actualCollection&lt;/tt&gt;. In this case, we go to the primary shard in case the &lt;tt&gt;actualCollection&lt;/tt&gt; is unsharded and thus only exists on that shard. The current logic expects that going to the primary shard will always throw an error (&lt;tt&gt;CollectionUUIDMismatch&lt;/tt&gt;, &lt;tt&gt;StaleShardVersion&lt;/tt&gt;, or &lt;tt&gt;StaleDbVersion&lt;/tt&gt;), however it turns out this is not always the case and it is possible for no error to be thrown. Consider a concurrent collection drop on the collection that is being queried; it will executed in three steps:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Remove entry from config.collections&lt;/li&gt;
	&lt;li&gt;Perform local &lt;tt&gt;dropCollection&lt;/tt&gt; on all non-primary shards&lt;/li&gt;
	&lt;li&gt;Perform local &lt;tt&gt;dropCollection&lt;/tt&gt; on the primary shard&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;If we go to the primary shard between steps 2 and 3, that shard will still have the collection despite not getting a stale version error.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2266476">SERVER-74097</key>
            <summary>Sharded find with expected collection UUID does not handle all cases of concurrent DDL operations</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="gregory.noma@mongodb.com">Gregory Noma</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Feb 2023 15:41:07 +0000</created>
                <updated>Sun, 29 Oct 2023 21:26:09 +0000</updated>
                            <resolved>Fri, 17 Feb 2023 21:45:23 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.0.5</fixVersion>
                    <fixVersion>6.3.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5217025" author="xgen-internal-githook" created="Tue, 21 Feb 2023 16:11:25 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74097&quot; title=&quot;Sharded find with expected collection UUID does not handle all cases of concurrent DDL operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74097&quot;&gt;&lt;del&gt;SERVER-74097&lt;/del&gt;&lt;/a&gt; Populate `CollectionUUIDMismatch` via `listCollections` for sharded find&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5a85ba8e15a9f0968c2307e35aefc8c259bc7151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5a85ba8e15a9f0968c2307e35aefc8c259bc7151&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5216898" author="xgen-internal-githook" created="Tue, 21 Feb 2023 15:51:42 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74097&quot; title=&quot;Sharded find with expected collection UUID does not handle all cases of concurrent DDL operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74097&quot;&gt;&lt;del&gt;SERVER-74097&lt;/del&gt;&lt;/a&gt; Populate `CollectionUUIDMismatch` via `listCollections` for sharded find&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 4c670108b0aa1f5903ddb0c4e74ab0cee518b151)&lt;br/&gt;
Branch: v6.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3dfde12941d33555ee44d935f5d55fd143d41801&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3dfde12941d33555ee44d935f5d55fd143d41801&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5209008" author="xgen-internal-githook" created="Fri, 17 Feb 2023 21:14:29 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Noma&apos;, &apos;email&apos;: &apos;gregory.noma@gmail.com&apos;, &apos;username&apos;: &apos;gregorynoma&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74097&quot; title=&quot;Sharded find with expected collection UUID does not handle all cases of concurrent DDL operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74097&quot;&gt;&lt;del&gt;SERVER-74097&lt;/del&gt;&lt;/a&gt; Populate `CollectionUUIDMismatch` via `listCollections` for sharded find&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4c670108b0aa1f5903ddb0c4e74ab0cee518b151&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4c670108b0aa1f5903ddb0c4e74ab0cee518b151&lt;/a&gt;&lt;/p&gt;</comment>
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