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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-57678] Dropping timeseries view and creating Collection on same namespace may be replicated out-of-order</title>
                <link>https://jira.mongodb.org/browse/SERVER-57678</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When dropping a Timeseries collection we hold a MODE_X lock on the bucket collection but just a MODE_IX lock on the view namespace.&lt;/p&gt;

&lt;p&gt;_abortIndexBuildsAndDrop called here is holding a MODE_X lock on the bucket Collection:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fd808e64b2a34bedfeeef012c2ef9314bec08e8f/src/mongo/db/catalog/drop_collection.cpp#L330&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/fd808e64b2a34bedfeeef012c2ef9314bec08e8f/src/mongo/db/catalog/drop_collection.cpp#L330&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;But the View is just holding a MODE_IX lock&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/fd808e64b2a34bedfeeef012c2ef9314bec08e8f/src/mongo/db/catalog/drop_collection.cpp#L91&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/fd808e64b2a34bedfeeef012c2ef9314bec08e8f/src/mongo/db/catalog/drop_collection.cpp#L91&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;If there is a create Collection happening concurrently (also MODE_IX) with dropping the view the operations may be written to the oplog out-of-order because create Collection reserves the oplog time before creating the Collection: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fd808e64b2a34bedfeeef012c2ef9314bec08e8f/src/mongo/db/catalog/database_impl.cpp#L679-L692&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/fd808e64b2a34bedfeeef012c2ef9314bec08e8f/src/mongo/db/catalog/database_impl.cpp#L679-L692&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;When this is then applied on a secondary the Collection creation fails with an invariant because there already exist a timeseries view on the namespace.&lt;/p&gt;

&lt;p&gt;A proposed solution is to hold a MODE_X lock on the view namespace when dropping timeseries collections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1780435">SERVER-57678</key>
            <summary>Dropping timeseries view and creating Collection on same namespace may be replicated out-of-order</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Jun 2021 14:55:08 +0000</created>
                <updated>Sun, 29 Oct 2023 21:52:13 +0000</updated>
                            <resolved>Wed, 16 Jun 2021 15:34:25 +0000</resolved>
                                                    <fixVersion>5.0.0-rc3</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4106816" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:09:43 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3885798" author="xgen-internal-githook" created="Thu, 17 Jun 2021 19:56:18 +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-57678&quot; title=&quot;Dropping timeseries view and creating Collection on same namespace may be replicated out-of-order&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57678&quot;&gt;&lt;del&gt;SERVER-57678&lt;/del&gt;&lt;/a&gt; Take MODE_X collection lock when dropping timeseries view.&lt;/p&gt;

&lt;p&gt;This is to prevent a concurrent create collection on the same namespace that will reserve an OpTime before the drop.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a616859a60e6cbb40ab0b7ddbeed06e726bd40bc)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fb5549f1ab3975b832ee64834317890d0ce61b94&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fb5549f1ab3975b832ee64834317890d0ce61b94&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3881331" author="xgen-internal-githook" created="Wed, 16 Jun 2021 14:57:17 +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-57678&quot; title=&quot;Dropping timeseries view and creating Collection on same namespace may be replicated out-of-order&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57678&quot;&gt;&lt;del&gt;SERVER-57678&lt;/del&gt;&lt;/a&gt; Take MODE_X collection lock when dropping timeseries view.&lt;/p&gt;

&lt;p&gt;This is to prevent a concurrent create collection on the same namespace that will reserve an OpTime before the drop.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a616859a60e6cbb40ab0b7ddbeed06e726bd40bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a616859a60e6cbb40ab0b7ddbeed06e726bd40bc&lt;/a&gt;&lt;/p&gt;</comment>
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