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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-57061] Concurrent writers can create a Collection and a View on the same namespace</title>
                <link>https://jira.mongodb.org/browse/SERVER-57061</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be41c9d532346c873c5b909a18fe92e8885337cb/src/mongo/db/catalog/create_collection.cpp#L426-L442&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;createCollection&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be41c9d532346c873c5b909a18fe92e8885337cb/src/mongo/db/catalog/database_impl.cpp#L638&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;createView&lt;/a&gt; cross checks the systems at a high level after acquiring the Collection MODE_IX lock.&lt;/p&gt;

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

&lt;p&gt;However, writes to the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be41c9d532346c873c5b909a18fe92e8885337cb/src/mongo/db/catalog/uncommitted_collections.cpp#L150-L152&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;CollectionCatalog&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be41c9d532346c873c5b909a18fe92e8885337cb/src/mongo/db/views/view_catalog.cpp#L526-L527&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ViewCatalog&lt;/a&gt; are serialized individually making it possible that both a Collection and View to be added.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1731220">SERVER-57061</key>
            <summary>Concurrent writers can create a Collection and a View on the same namespace</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="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                            <label>post-rc0</label>
                            <label>read-only-views</label>
                    </labels>
                <created>Wed, 19 May 2021 13:05:36 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:20 +0000</updated>
                            <resolved>Fri, 28 May 2021 20:59:55 +0000</resolved>
                                    <version>4.4.0</version>
                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4108172" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:59:07 +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="3858919" author="xgen-internal-githook" created="Fri, 4 Jun 2021 00:07:59 +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-57061&quot; title=&quot;Concurrent writers can create a Collection and a View on the same namespace&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57061&quot;&gt;&lt;del&gt;SERVER-57061&lt;/del&gt;&lt;/a&gt; Make CollectionCatalog aware of namespaces used by ViewCatalog.&lt;/p&gt;

&lt;p&gt;The CollectionCatalog can now ensure a namespace is not concurrently registered for a Collection and View.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit af3e6c163fd3cc80ee1c7433943135e943432598)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1c1b02e3a0ff3a5b13a73c7d36d6750c02d2848&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1c1b02e3a0ff3a5b13a73c7d36d6750c02d2848&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3848498" author="xgen-internal-githook" created="Fri, 28 May 2021 20:31:44 +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-57061&quot; title=&quot;Concurrent writers can create a Collection and a View on the same namespace&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57061&quot;&gt;&lt;del&gt;SERVER-57061&lt;/del&gt;&lt;/a&gt; Make CollectionCatalog aware of namespaces used by ViewCatalog.&lt;/p&gt;

&lt;p&gt;The CollectionCatalog can now ensure a namespace is not concurrently registered for a Collection and View.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/af3e6c163fd3cc80ee1c7433943135e943432598&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/af3e6c163fd3cc80ee1c7433943135e943432598&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3795738" author="daniel.gottlieb@10gen.com" created="Thu, 20 May 2021 17:16:25 +0000"  >&lt;p&gt;Marking that this likely affects 4.4 and likewise requested a backport. Will let storage execution deem if it&apos;s worth backporting.&lt;/p&gt;</comment>
                            <comment id="3795080" author="daniel.gottlieb@10gen.com" created="Thu, 20 May 2021 15:37:31 +0000"  >&lt;p&gt;Does this date back to the project for collection creation to take IX locks? Can&apos;t recall if that was 4.2 or 4.4.&lt;/p&gt;</comment>
                            <comment id="3792588" author="geert.bosch" created="Wed, 19 May 2021 17:24:21 +0000"  >&lt;p&gt;Could this be fixed by view creation taking a &lt;tt&gt;MODE_X&lt;/tt&gt; lock?&lt;/p&gt;</comment>
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