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    <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>
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<item>
            <title>[SERVER-71177] Timeseries collection creation fails due to incompatible validator between 6.0 and subsequent versions</title>
                <link>https://jira.mongodb.org/browse/SERVER-71177</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The steps that leads to this issue are the following:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Start timeseries collection creation on the replset primary node with binary 6.0&lt;/li&gt;
	&lt;li&gt;Stepdown happens &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7e3381f8a26e6bb01d4715961f6babadff651de0/src/mongo/db/catalog/create_collection.cpp#L357&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; after creating the bucket collection but before creating the associated view.&lt;/li&gt;
	&lt;li&gt;A new primary of replicaset with binary 6.1 or later is elected&lt;/li&gt;
	&lt;li&gt;Retry the same create collection&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The second create will fail with:&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;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;NamespaceExists: Bucket Collection already exists&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;And it will leave a bucket collection without the associated view.&lt;/p&gt;

&lt;p&gt;The reason is that the second create operation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7e3381f8a26e6bb01d4715961f6babadff651de0/src/mongo/db/catalog/create_collection.cpp#L289-L292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;will not find the view&lt;/a&gt; but it will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7e3381f8a26e6bb01d4715961f6babadff651de0/src/mongo/db/catalog/create_collection.cpp#L335-L336&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;find the bucket collection&lt;/a&gt;, then it will try to see if collectionOptions  of the existing bucket collection match the options from the second create operation and it will fail because the validator created in 6.0 is different from the one of later versions. In fact in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68129&quot; title=&quot;Add the field `control.count` to the schema validation for bucket collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68129&quot;&gt;&lt;del&gt;SERVER-68129&lt;/del&gt;&lt;/a&gt; we added the control.count field.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2178394">SERVER-71177</key>
            <summary>Timeseries collection creation fails due to incompatible validator between 6.0 and subsequent versions</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                    </labels>
                <created>Tue, 8 Nov 2022 18:22:42 +0000</created>
                <updated>Sun, 29 Oct 2023 21:30:54 +0000</updated>
                            <resolved>Thu, 23 Feb 2023 17:54:52 +0000</resolved>
                                    <version>6.1.0-rc0</version>
                    <version>6.2.0-rc0</version>
                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5222147" author="xgen-internal-githook" created="Wed, 22 Feb 2023 18:16:44 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71177&quot; title=&quot;Timeseries collection creation fails due to incompatible validator between 6.0 and subsequent versions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71177&quot;&gt;&lt;del&gt;SERVER-71177&lt;/del&gt;&lt;/a&gt; Allow existing time-series bucket collections with old validator version when creating time-series collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9ced3cf3642929a56e741752ba742a4a9b4a847a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9ced3cf3642929a56e741752ba742a4a9b4a847a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5192785" author="henrik.edin" created="Mon, 13 Feb 2023 13:24:05 +0000"  >&lt;p&gt;This case is equivalent to not being able to create a time-series collection due to something incompatible occupying the bucket namespace. The tests begin by dropping any previous collections/views but when collections occupy both the user-facing namespace and the bucket namespace only one Collection will be dropped. I&apos;m worried about the impact of prohibiting collections on both namespaces in our tools and initial sync. It is best to defer cleaning this up until we can create both the time-series view and bucket collection atomically and deal with any upgrade/downgrade issues at that point.&lt;/p&gt;

&lt;p&gt;We can put a bandaid in our tests by calling drop twice which will ensure we will succeed with creating a time-series collection when we started in the situation outlined above.&lt;/p&gt;</comment>
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