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    <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-35999] A $changeStream can trigger assertion on UUID check when the collection cache is stale</title>
                <link>https://jira.mongodb.org/browse/SERVER-35999</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;UUIDs were introduced in v3.6, however after upgrading from 3.4 it&apos;s possible that the collection state in-memory cache contains an entry for the collection (meaning it&apos;s sharded) but does &lt;em&gt;not&lt;/em&gt; contain a UUID.&#160; As such, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v3.6/src/mongo/db/pipeline/pipeline_d.cpp#L369&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this assertion&lt;/a&gt; will fail when a $changeStream compares the UUID from the oplog entry to the UUID in the collection state cache.&lt;/p&gt;

&lt;p&gt;&#160;Edit:&lt;/p&gt;

&lt;p&gt;Since change streams requires readConcern majority, the secondary will perform a shard version check but not necessarily refresh its cache. For change streams, mongos will &lt;em&gt;not&lt;/em&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v3.6/src/mongo/s/commands/cluster_aggregate.cpp#L273-L279&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attach a shard version&lt;/a&gt; which means that the version check will always pass and no refresh is performed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="568753">SERVER-35999</key>
            <summary>A $changeStream can trigger assertion on UUID check when the collection cache is stale</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Jul 2018 19:04:12 +0000</created>
                <updated>Mon, 16 Jul 2018 20:56:23 +0000</updated>
                            <resolved>Mon, 16 Jul 2018 20:56:23 +0000</resolved>
                                    <version>3.6.5</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1948548" author="nicholas.zolnierz" created="Mon, 16 Jul 2018 20:56:05 +0000"  >&lt;p&gt;There won&apos;t be any changes to the aggregation/$changeStream side of this issue, so marking as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36154&quot; title=&quot;Shard&amp;#39;s in-memory CSS is not refreshed after upgrading from 3.4 to 3.6, causing a UUID mismatch on $changeStream operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36154&quot;&gt;&lt;del&gt;SERVER-36154&lt;/del&gt;&lt;/a&gt; as it more accurately describes the root cause and also contains the simplest repro case.&lt;/p&gt;</comment>
                            <comment id="1946706" author="ian@10gen.com" created="Fri, 13 Jul 2018 14:46:44 +0000"  >&lt;p&gt;First step is just to write a repro to aid the conversation with Sharding about where the problem is.&lt;/p&gt;</comment>
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