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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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>
    </build-info>


<item>
            <title>[SERVER-76624] Server can falsely report CollectionUUIDMismatch</title>
                <link>https://jira.mongodb.org/browse/SERVER-76624</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a &lt;a href=&quot;https://spruce.mongodb.com/task/mongosync_amazon2_arm64_e2e_replica_set_47bb9e3227c099cc3a88b20c7e25af1447232794_23_04_24_14_15_17/logs?execution=0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongosync test run&lt;/a&gt;, mongod mistakenly reported a collectionUUIDMismatch error. The sequence of events was:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;mongosync creates a collection, testDB.userWriteBlockColl&lt;/li&gt;
	&lt;li&gt;mongod successfully does so, and gives it the UUID 3ca88158-8e77-49fb-9fcd-1bff14d26f5f&lt;/li&gt;
	&lt;li&gt;mongosync runs the following command, with that UUID, and gets a collectionUUIDMismatch error&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;The mongod returns this very confusing error, with the same UUID and the same collection name in both expected and actual collection:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    db:                 &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;testDB&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    collectionUUID:     UUID(&lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;), &lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    expectedCollection: &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;userWriteBlockColl&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    actualCollection:   &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;userWriteBlockColl&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I collected some of the relevant logs in &lt;a href=&quot;https://gist.github.com/mmcclimon/06b6c3db9c7972edf9b19cde357719e8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this GitHub gist&lt;/a&gt;, but the full mongod logs are available from &lt;a href=&quot;https://spruce.mongodb.com/task/mongosync_amazon2_arm64_e2e_replica_set_47bb9e3227c099cc3a88b20c7e25af1447232794_23_04_24_14_15_17/files?execution=0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the Evergreen task page&lt;/a&gt; for the failed mongosync tests.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2326467">SERVER-76624</key>
            <summary>Server can falsely report CollectionUUIDMismatch</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="michael.mcclimon@mongodb.com">Michael McClimon</reporter>
                        <labels>
                            <label>car-qw</label>
                    </labels>
                <created>Thu, 27 Apr 2023 20:10:54 +0000</created>
                <updated>Thu, 1 Feb 2024 17:08:05 +0000</updated>
                            <resolved>Thu, 1 Feb 2024 13:48:24 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="6059066" author="JIRAUSER1264163" created="Thu, 1 Feb 2024 13:47:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rohan.sharan%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;rohan.sharan@mongodb.com&quot;&gt;rohan.sharan@mongodb.com&lt;/a&gt; I can more or less confirm that if you were to use &lt;tt&gt;afterClusterTime&lt;/tt&gt; to enforce causal consistency this issue would be fixed. Closing this as Won&apos;t Fix as there&apos;s nothing else on our end to solve.&lt;/p&gt;</comment>
                            <comment id="5578482" author="JIRAUSER1264979" created="Wed, 19 Jul 2023 23:49:45 +0000"  >&lt;p&gt;Yeah actually apparently it uses read preference &lt;b&gt;nearest&lt;/b&gt; by default on the source cluster, which is where&#160;&lt;b&gt;SampleCollection&lt;/b&gt; is being run. It doesn&apos;t use causal consistency, and it never would be able to run source collection creation and the aggregation in the same session, because the source collection creation is not done by mongosync (mongosync doesn&apos;t write to the source cluster).&lt;/p&gt;

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

&lt;p&gt;I created a ticket REP-2956 in mongosync to consider any of the following changes:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Leave it as is (we retry on actualCollection = expectedCollection 5 times sleeping 1s between retries)&#160;&lt;/li&gt;
	&lt;li&gt;Audit reads on the source cluster and either:
	&lt;ul&gt;
		&lt;li&gt;Add an&#160;&lt;b&gt;afterClusterTime&lt;/b&gt;&#160;to reads&lt;/li&gt;
		&lt;li&gt;Explicitly make the read preference primary or primary preferred.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;


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

&lt;p&gt;Do the all of the 3 options mentioned above individually seem like they&apos;ll take care of the issue?&lt;/p&gt;

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

&lt;p&gt;Also, despite this popping up because mongosync is reading from a secondary, isn&apos;t this incorrect server behavior?&lt;/p&gt;</comment>
                            <comment id="5576280" author="JIRAUSER1257318" created="Wed, 19 Jul 2023 10:15:27 +0000"  >&lt;p&gt;My reading of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76624?focusedCommentId=5564055&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-5564055&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;the latest logs linked in this comment&lt;/a&gt; is the same &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=huayu.ouyang%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;huayu.ouyang@mongodb.com&quot;&gt;huayu.ouyang@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76624?focusedCommentId=5528986&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-5528986&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;concluded above&lt;/a&gt;. It appears that mongosync targeted an aggregation to a secondary shard node that was in the process of replicating the collection creation (possibly still hadn&apos;t, but I can&apos;t really tell from the logs), therefore it did not know about the expectedUUID so it threw CollectionUUIDMismatch.&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// j1:cl0:s1:n0 replicates the collection creation&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[j1:cl0:s1:n0] 22:06:25.390Z | 2023-07-12T22:06:25.389+00:00 I  STORAGE  20320   [ReplWriterWorker-1] &quot;createCollection&quot;,&quot;attr&quot;:{&quot;namespace&quot;:&quot;test.regex9&quot;,&quot;uuidDisposition&quot;:&quot;provided&quot;,&quot;uuid&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;2fc0c120-7ab8-4a0b-8cc9-10985cf67261&quot;}},&quot;options&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;2fc0c120-7ab8-4a0b-8cc9-10985cf67261&quot;}}}&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// mongos gets a CollectionUUIDMismatch error when trying to establish cursors on shard for an aggregation&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[j1:cl0:s] 22:06:25.463Z | 2023-07-12T22:06:25.463+00:00 I  QUERY    4625501 [conn109] &quot;Unable to establish remote cursors&quot;,&quot;attr&quot;:{&quot;error&quot;:{&quot;code&quot;:361,&quot;codeName&quot;:&quot;CollectionUUIDMismatch&quot;,&quot;errmsg&quot;:&quot;Collection UUID does not match that specified&quot;,&quot;db&quot;:&quot;test&quot;,&quot;collectionUUID&quot;:{&quot;$uuid&quot;:&quot;2fc0c120-7ab8-4a0b-8cc9-10985cf67261&quot;},&quot;expectedCollection&quot;:&quot;regex9&quot;,&quot;actualCollection&quot;:&quot;regex9&quot;},&quot;nRemotes&quot;:1}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[MultipleReplicatorFixture:j1:replicator1] 22:06:25.465Z {&quot;level&quot;:&quot;fatal&quot;,&quot;serverID&quot;:&quot;79c97d01&quot;,&quot;mongosyncID&quot;:&quot;shard-rs1&quot;,&quot;stack&quot;:[{&quot;func&quot;:&quot;(*Mongosync).SampleCollection&quot;,&quot;line&quot;:&quot;465&quot;,&quot;source&quot;:&quot;/data/mci/d1d8c51b07c3cbfab081b19a39a04e3b/src/github.com/10gen/mongosync/internal/mongosync/initialize_sharding.go&quot;},{&quot;func&quot;:&quot;(*Mongosync).Presplit&quot;,&quot;line&quot;:&quot;302&quot;,&quot;source&quot;:&quot;/data/mci/d1d8c51b07c3cbfab081b19a39a04e3b/src/github.com/10gen/mongosync/internal/mongosync/initialize_sharding.go&quot;},{&quot;func&quot;:&quot;(*Mongosync).ShardCollectionOnDestination&quot;,&quot;line&quot;:&quot;113&quot;,&quot;source&quot;:&quot;/data/mci/d1d8c51b07c3cbfab081b19a39a04e3b/src/github.com/10gen/mongosync/internal/mongosync/initialize_sharding.go&quot;},{&quot;func&quot;:&quot;(*Mongosync).InitializeCollectionsAndIndexes&quot;,&quot;line&quot;:&quot;236&quot;,&quot;source&quot;:&quot;/data/mci/d1d8c51b07c3cbfab081b19a39a04e3b/src/github.com/10gen/mongosync/internal/mongosync/initialize_main.go&quot;},{&quot;func&quot;:&quot;(*Mongosync).Replicate&quot;,&quot;line&quot;:&quot;1299&quot;,&quot;source&quot;:&quot;/data/mci/d1d8c51b07c3cbfab081b19a39a04e3b/src/github.com/10gen/mongosync/internal/mongosync/mongosync.go&quot;},{&quot;func&quot;:&quot;(*Mongosync).launchReplicationThread.func1&quot;,&quot;line&quot;:&quot;1557&quot;,&quot;source&quot;:&quot;/data/mci/d1d8c51b07c3cbfab081b19a39a04e3b/src/github.com/10gen/mongosync/internal/mongosync/mongosync.go&quot;},{&quot;func&quot;:&quot;goexit&quot;,&quot;line&quot;:&quot;1594&quot;,&quot;source&quot;:&quot;/opt/golang/go1.19/src/runtime/asm_amd64.s&quot;}],&quot;error&quot;:&quot;encountered a problem in the cursor when trying to $sample and $bucketAuto aggregation for source namespace &apos;test.&apos;, UUID 2fc0c120-7ab8-4a0b-8cc9-10985cf67261.: got a collection UUID mismatch error but the actual collection name (regex9) matches the last used name (regex9) - giving up on retries&quot;,&quot;time&quot;:&quot;2023-07-12T22:06:25.465882806Z&quot;,&quot;message&quot;:&quot;Error during replication&quot;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rohan.sharan%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;rohan.sharan@mongodb.com&quot;&gt;rohan.sharan@mongodb.com&lt;/a&gt; Can you confirm whether &lt;a href=&quot;https://github.com/10gen/mongosync/blob/e150983ae5b129dd7a552557b35e07d632ecbabd/internal/mongosync/initialize_sharding.go#L412&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongosync&apos;s SampleCollection&lt;/a&gt; performs secondary reads? If so, does it use causal consistent sessions? Also, did the source collection creation happen on the same client/session as mongosync is running the aggregate or a different one? Otherwise we&apos;d need mongosync to pass a causal consistency token that is inclusive of the collection creation so that later the aggregation can be guaranteed to see the effects of the collection creation.&lt;/p&gt;</comment>
                            <comment id="5551153" author="huayu.ouyang" created="Fri, 7 Jul 2023 17:33:30 +0000"  >&lt;p&gt;I have tried to reproduce this bug but have not been able to. Since this occurred only once back in April, it might be possible that changes to how &lt;tt&gt;AutoGetCollection&lt;/tt&gt; and lock free reads work since then like &lt;a href=&quot;https://github.com/10gen/mongo/commit/e7b145405e5e076ebe59354a34cb3a74a67e2c5e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/e7b145405e5e076ebe59354a34cb3a74a67e2c5e&lt;/a&gt; or &lt;a href=&quot;https://github.com/10gen/mongo/commit/014850f5f9d0e2cd9490755e94fe7a17570f7a70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo/commit/014850f5f9d0e2cd9490755e94fe7a17570f7a70&lt;/a&gt; have also solved the issue. Additionally, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77685&quot; title=&quot;Server can return CollectionUUIDMismatch with actual collection null if collection exists&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77685&quot;&gt;&lt;del&gt;SERVER-77685&lt;/del&gt;&lt;/a&gt; was recently merged which also moves the collection uuid mismatch check later in AutoGetCollection constructors, after a consistent snapshot of the catalog is made. &lt;/p&gt;

&lt;p&gt;Closing this as Cannot Reproduce, but if this reoccurs feel free to re-open or file a new ticket. &lt;/p&gt;</comment>
                            <comment id="5528986" author="huayu.ouyang" created="Tue, 27 Jun 2023 19:12:10 +0000"  >&lt;p&gt;From srcCluster-rs-27020.log (which is a secondary) it seems like we successfully create the userWriteBlock coll&lt;/p&gt;
&lt;p/&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.120+00:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;REPL&quot;,     &quot;id&quot;:7360109, &quot;ctx&quot;:&quot;ReplBatcher&quot;,&quot;msg&quot;:&quot;Processing DDL command oplog entry in OplogBatcher&quot;,&quot;attr&quot;:{&quot;oplogEntry&quot;:{&quot;oplogEntry&quot;:{&quot;op&quot;:&quot;c&quot;,&quot;ns&quot;:&quot;testDB.$cmd&quot;,&quot;ui&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;},&quot;o&quot;:{&quot;create&quot;:&quot;userWriteBlockColl&quot;,&quot;idIndex&quot;:{&quot;v&quot;:2,&quot;key&quot;:{&quot;_id&quot;:1},&quot;name&quot;:&quot;_id_&quot;}},&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1682347100,&quot;i&quot;:2}},&quot;t&quot;:2,&quot;v&quot;:2,&quot;wall&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.119Z&quot;}}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.120+00:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;REPL&quot;,     &quot;id&quot;:7360110, &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;Applying DDL command oplog entry&quot;,&quot;attr&quot;:{&quot;oplogEntry&quot;:{&quot;oplogEntry&quot;:{&quot;op&quot;:&quot;c&quot;,&quot;ns&quot;:&quot;testDB.$cmd&quot;,&quot;ui&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;},&quot;o&quot;:{&quot;create&quot;:&quot;userWriteBlockColl&quot;,&quot;idIndex&quot;:{&quot;v&quot;:2,&quot;key&quot;:{&quot;_id&quot;:1},&quot;name&quot;:&quot;_id_&quot;}},&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1682347100,&quot;i&quot;:2}},&quot;t&quot;:2,&quot;v&quot;:2,&quot;wall&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.119Z&quot;}}},&quot;oplogApplicationMode&quot;:&quot;Secondary&quot;}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.120+00:00&quot;},&quot;s&quot;:&quot;D1&quot;, &quot;c&quot;:&quot;STORAGE&quot;,  &quot;id&quot;:20324,   &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;create collection {namespace} {collectionOptions}&quot;,&quot;attr&quot;:{&quot;namespace&quot;:&quot;testDB.userWriteBlockColl&quot;,&quot;collectionOptions&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.121+00:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;STORAGE&quot;,  &quot;id&quot;:20320,   &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;createCollection&quot;,&quot;attr&quot;:{&quot;namespace&quot;:&quot;testDB.userWriteBlockColl&quot;,&quot;uuidDisposition&quot;:&quot;provided&quot;,&quot;uuid&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;}},&quot;options&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.134+00:00&quot;},&quot;s&quot;:&quot;D1&quot;, &quot;c&quot;:&quot;STORAGE&quot;,  &quot;id&quot;:20280,   &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;Registering collection&quot;,&quot;attr&quot;:{&quot;namespace&quot;:&quot;testDB.userWriteBlockColl&quot;,&quot;uuid&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.134+00:00&quot;},&quot;s&quot;:&quot;D1&quot;, &quot;c&quot;:&quot;STORAGE&quot;,  &quot;id&quot;:5255601, &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;Finished writing to the CollectionCatalog&quot;,&quot;attr&quot;:{&quot;jobs&quot;:1}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.134+00:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;INDEX&quot;,    &quot;id&quot;:20345,   &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;Index build: done building&quot;,&quot;attr&quot;:{&quot;buildUUID&quot;:null,&quot;collectionUUID&quot;:{&quot;uuid&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;}},&quot;namespace&quot;:&quot;testDB.userWriteBlockColl&quot;,&quot;index&quot;:&quot;_id_&quot;,&quot;ident&quot;:&quot;index-558--4346920690633467779&quot;,&quot;collectionIdent&quot;:&quot;collection-557--4346920690633467779&quot;,&quot;commitTimestamp&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1682347100,&quot;i&quot;:2}}}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.134+00:00&quot;},&quot;s&quot;:&quot;D1&quot;, &quot;c&quot;:&quot;STORAGE&quot;,  &quot;id&quot;:5255601, &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;Finished writing to the CollectionCatalog&quot;,&quot;attr&quot;:{&quot;jobs&quot;:1}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.134+00:00&quot;},&quot;s&quot;:&quot;I&quot;,  &quot;c&quot;:&quot;REPL&quot;,     &quot;id&quot;:51801,   &quot;ctx&quot;:&quot;ReplWriterWorker-0&quot;,&quot;msg&quot;:&quot;Applied op&quot;,&quot;attr&quot;:{&quot;command&quot;:{&quot;op&quot;:&quot;c&quot;,&quot;ns&quot;:&quot;testDB.$cmd&quot;,&quot;ui&quot;:{&quot;$uuid&quot;:&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f&quot;},&quot;o&quot;:{&quot;create&quot;:&quot;userWriteBlockColl&quot;,&quot;idIndex&quot;:{&quot;v&quot;:2,&quot;key&quot;:{&quot;_id&quot;:1},&quot;name&quot;:&quot;_id_&quot;}},&quot;ts&quot;:{&quot;$timestamp&quot;:{&quot;t&quot;:1682347100,&quot;i&quot;:2}},&quot;t&quot;:2,&quot;v&quot;:2,&quot;wall&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.119Z&quot;}},&quot;durationMillis&quot;:14}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Immediately afterwards we get this user assertion: &lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&quot;t&quot;:{&quot;$date&quot;:&quot;2023-04-24T14:38:20.134+00:00&quot;},&quot;s&quot;:&quot;D1&quot;, &quot;c&quot;:&quot;ASSERT&quot;,   &quot;id&quot;:23074,   &quot;ctx&quot;:&quot;conn503&quot;,&quot;msg&quot;:&quot;User assertion&quot;,&quot;attr&quot;:{&quot;error&quot;:&quot;CollectionUUIDMismatch{ db: \&quot;testDB\&quot;, collectionUUID: UUID(\&quot;3ca88158-8e77-49fb-9fcd-1bff14d26f5f\&quot;), expectedCollection: \&quot;userWriteBlockColl\&quot;, actualCollection: \&quot;userWriteBlockColl\&quot; }: Collection UUID does not match that specified&quot;,&quot;file&quot;:&quot;src/mongo/db/catalog/collection_uuid_mismatch.cpp&quot;,&quot;line&quot;:70}}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;This comes from &lt;a href=&quot;https://github.com/10gen/mongo/blob/8e9d1db4eb46440a5b1e96d904979b4926ffd036/src/mongo/db/catalog/collection_uuid_mismatch.cpp#L77-L85&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. &lt;br/&gt;
A similar thing happened in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77685&quot; title=&quot;Server can return CollectionUUIDMismatch with actual collection null if collection exists&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77685&quot;&gt;&lt;del&gt;SERVER-77685&lt;/del&gt;&lt;/a&gt;, but that was on sharded clusters, and this is on replica sets. &lt;/p&gt;

&lt;p&gt;It seems like we&apos;re uasserting because the collection we get vs the UUID that is passed in don&apos;t have the same UUID, but then when we &lt;a href=&quot;https://github.com/10gen/mongo/blob/8e9d1db4eb46440a5b1e96d904979b4926ffd036/src/mongo/db/catalog/collection_uuid_mismatch.cpp#L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;lookup the namespace of the UUID that is passed in&lt;/a&gt;, we DO get a namespace that is the same as the expected namespace. &lt;/p&gt;

&lt;p&gt;On mongosync we do writes with majority write concern, but we&apos;re doing a read on the secondary right now, so it&apos;s possible the write didn&apos;t reach this secondary. However, we should be seeing a consistent view of the catalog throughout this operation, so when we lookup of the namespace of the passed in UUID, it should have not returned any namespace if the collection wasn&apos;t created yet. &lt;/p&gt;

&lt;p&gt;I looked at the &lt;tt&gt;CollectionCatalog::lookupNSSByUUID&lt;/tt&gt; function and it seems like it first does &lt;tt&gt;UncommittedCatalogUpdates::lookupCollection&lt;/tt&gt; so I&apos;m wondering if this might be getting the new collection that was created?&lt;/p&gt;

&lt;p&gt;Talked to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gregory.noma%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;gregory.noma@mongodb.com&quot;&gt;gregory.noma@mongodb.com&lt;/a&gt; offline and we noted that related tickets REP-832 and/or REP-2743 might solve this on the mongosync side but I will continue investigating why this is occurring on the server side. &lt;/p&gt;</comment>
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