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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-42373] Prevent &quot;invalid view definition&quot; error while dropping nonexistent collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-42373</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a world where an invalid view exists in the view catalog for a database:&lt;/p&gt;

&lt;p&gt;Concurrent dropCollections for the same namespace will fail due to an invalid view definition. If a collection is successfully dropped the first time, the happy path will not conflict with the view catalog. The second time, since we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/093b5bf0d87d3415e32af22ce8a7f19a47f64929/src/mongo/db/catalog/drop_collection.cpp#L170-L172&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;don&apos;t find the collection in the catalog&lt;/a&gt;, we assume that we have a view instead. We attempt to look up said view, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/093b5bf0d87d3415e32af22ce8a7f19a47f64929/src/mongo/db/catalog/drop_collection.cpp#L59-L65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;causing the invalid view definition error&lt;/a&gt; &lt;em&gt;even if said view doesn&apos;t exist&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;This behavior breaks the invalid system views contract, which is that an invalid view in the view catalog should not interfere with attempting to run operations on unrelated collections.&lt;/p&gt;

&lt;p&gt;It&apos;s possible just to make a first pass through the view catalog to verify if a view exists &lt;em&gt;without validating durable views&lt;/em&gt;, then to make another pass with validation on if the view does indeed exist.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="874040">SERVER-42373</key>
            <summary>Prevent &quot;invalid view definition&quot; error while dropping nonexistent collection</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="haley.connelly@mongodb.com">Haley Connelly</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Jul 2019 13:47:00 +0000</created>
                <updated>Sun, 29 Oct 2023 22:18:49 +0000</updated>
                            <resolved>Fri, 20 Sep 2019 18:16:58 +0000</resolved>
                                    <version>3.4.21</version>
                    <version>3.6.13</version>
                    <version>4.0.10</version>
                    <version>4.1.13</version>
                    <version>4.2.0-rc4</version>
                                    <fixVersion>4.2.1</fixVersion>
                    <fixVersion>4.3.1</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2480841" author="xgen-internal-githook" created="Mon, 14 Oct 2019 19:14:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42373&quot; title=&quot;Prevent &amp;quot;invalid view definition&amp;quot; error while dropping nonexistent collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42373&quot;&gt;&lt;del&gt;SERVER-42373&lt;/del&gt;&lt;/a&gt; Prevent &quot;invalid view definition&quot; error while dropping nonexistent collection&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 00bd5405dfaa44f3094965cf6bb0e6dc55062b99)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3135b6a77d4fbabccc113186817ba670e31d13b6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3135b6a77d4fbabccc113186817ba670e31d13b6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2426742" author="xgen-internal-githook" created="Fri, 20 Sep 2019 18:00:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Haley Connelly&apos;, &apos;username&apos;: &apos;haleyConnelly&apos;, &apos;email&apos;: &apos;haley.connelly@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42373&quot; title=&quot;Prevent &amp;quot;invalid view definition&amp;quot; error while dropping nonexistent collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42373&quot;&gt;&lt;del&gt;SERVER-42373&lt;/del&gt;&lt;/a&gt; Prevent &quot;invalid view definition&quot; error while dropping nonexistent collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/00bd5405dfaa44f3094965cf6bb0e6dc55062b99&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/00bd5405dfaa44f3094965cf6bb0e6dc55062b99&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2411241" author="milkie" created="Fri, 6 Sep 2019 19:15:54 +0000"  >&lt;p&gt;We should fix this issue long-term by prohibiting writes to system.views.&lt;br/&gt;
The short term fix for the fuzzer failures is to avoid the invalid view definition error for this code path.&lt;/p&gt;</comment>
                            <comment id="2345551" author="milkie" created="Fri, 26 Jul 2019 14:53:02 +0000"  >&lt;p&gt;We should brainstorm solutions to this issue.&lt;/p&gt;</comment>
                    </comments>
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