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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35254] Resuming a change stream on a stale mongos with a valid resume token may incorrectly fail</title>
                <link>https://jira.mongodb.org/browse/SERVER-35254</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32088&quot; title=&quot;ChangeStream resumeAfter does not work on sharded collections if not all shards have chunks for the collection &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32088&quot;&gt;&lt;del&gt;SERVER-32088&lt;/del&gt;&lt;/a&gt;, the following scenario would incorrectly fail to resume:&lt;/p&gt;

&lt;p&gt;1. Create and shard collection through mongos1 (the soon-to-be stale mongos).&lt;br/&gt;
2. Drop and recreate the same collection name through mongos2.&lt;br/&gt;
3. Open a change stream through mongos2 and obtain a valid resume token.&lt;br/&gt;
4. Attempt to resume using the resume token from (3) through mongos1, which is now stale. &lt;br/&gt;
--&amp;gt; The mongos will compare it&apos;s stale collection&apos;s UUID to the UUID in the resume token, and incorrectly assert. &lt;/p&gt;

&lt;p&gt;One potential fix is to always perform a hard refresh of the shard registry if we&apos;re attempting to resume a change stream, before getting the collection UUID.&lt;/p&gt;</description>
                <environment></environment>
        <key id="550012">SERVER-35254</key>
            <summary>Resuming a change stream on a stale mongos with a valid resume token may incorrectly fail</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Fri, 25 May 2018 21:25:42 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:24 +0000</updated>
                            <resolved>Sun, 17 May 2020 12:31:52 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3091333" author="bernard.gorman" created="Sun, 17 May 2020 12:31:53 +0000"  >&lt;p&gt;This is no longer an issue. The explicit UUID check was performed only to determine whether we could correctly inherit the collection&apos;s default collation. As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39302&quot; title=&quot;Change streams should always use the simple collation when no explicit collation is provided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39302&quot;&gt;&lt;del&gt;SERVER-39302&lt;/del&gt;&lt;/a&gt;, we no longer inherit the collation and so &lt;a href=&quot;https://github.com/mongodb/mongo/commit/4054c2b07cb658a44fc51d145a1688483e18d666#diff-55f0130626e5cb0bac75fb0eb5ae7eef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this check is no longer necessary&lt;/a&gt;.&lt;/p&gt;</comment>
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