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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>
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<item>
            <title>[DOCS-12990] Investigate changes in SERVER-41947: Disallow using the &quot;system.views&quot; collection name as the source or target names in the rename command</title>
                <link>https://jira.mongodb.org/browse/DOCS-12990</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    renaming &quot;system.views&quot; or renaming any collection to &quot;system.views&quot; via command is not allowed.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    This is a bug fix for a build failure where the following scenario leads to a deadlock:&lt;/p&gt;

&lt;p&gt;T1: Rename command is renaming &apos;test.coll&apos; to &apos;test.system.views&apos;, so it has the MODE_IX on &apos;test&apos; and MODE_X on both &apos;coll&apos; and &apos;system.views&apos;. The next step is to check if &apos;coll&apos; is a view by calling the ViewCatalog::lookup() and waiting to acquire the ViewCatalog mutex which is currently held by T2.&lt;/p&gt;

&lt;p&gt;T2: Running CountCmd on a collection that didn&apos;t exist, but in AutoGetCollection we check if it could be a view and call ViewCatalog::lookup(), here we see that the ViewCatalog is invalidated, so we call &lt;tt&gt;_reloadIfNeeded&lt;/tt&gt;. Now &lt;tt&gt;_reloadIfNeeded()&lt;/tt&gt; uses the DurableViewCatalog::iterate but that requires the MODE_IS lock on the &apos;test.system.views&apos; collection which is currently held by T1.&lt;/p&gt;

&lt;p&gt;So we have a deadlock where:&lt;br/&gt;
T1 has MODE_X on &apos;test.system.views&apos; but is waiting for ViewCatalog mutex.&lt;br/&gt;
T2 has ViewCatalog mutex during reload and needs MODE_IS on &apos;test.system.views&apos;.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="910592">DOCS-12990</key>
            <summary>Investigate changes in SERVER-41947: Disallow using the &quot;system.views&quot; collection name as the source or target names in the rename command</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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Aug 2019 20:44:24 +0000</created>
                <updated>Mon, 13 Nov 2023 18:16:45 +0000</updated>
                            <resolved>Thu, 17 Oct 2019 16:36:21 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.1</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2487108" author="kay.kim@10gen.com" created="Thu, 17 Oct 2019 16:36:21 +0000"  >&lt;p&gt;This actually doesn&apos;t need docs. &lt;/p&gt;</comment>
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