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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-12980] Investigate changes in SERVER-33272: The DatabaseHolder::close() function no longer requires a global write lock and neither does the dropDatabase command.</title>
                <link>https://jira.mongodb.org/browse/DOCS-12980</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;In addition to the work done above, the `dropDatabase` command no longer requires a global exclusive lock but instead only needs a database exclusive lock to drop a database.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;



&lt;h2&gt;&lt;a name=&quot;OldDescriptionofLinkedTicket%28SERVERticketsplitandtheolddescriptionisforSERVER43925andwillbedoc%27edseparately%29&quot;&gt;&lt;/a&gt;Old Description of Linked Ticket (SERVER ticket split and the old description is for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43925&quot; title=&quot;Proactively close newly empty databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43925&quot;&gt;SERVER-43925&lt;/a&gt; and will be doc&apos;ed separately)&lt;/h2&gt;



&lt;p&gt;    Currently, the kv engine does not check to see if a database is empty after a collection drop. Thus, empty databases can persist until mongod restarts (or the catalog is reloaded via replication rollback to stable timestamp). This situation is usually benign, but a database entry&apos;s presence does do one thing: it enforces that no other databases that are spelled the same but differ in capitalization can be created.&lt;br/&gt;
 Because recover-to-timestamp exists, it can result in some replica set nodes having a catalog entry for an empty database while other nodes do not have such an entry. This can result in the ability to crash secondary nodes that have an empty database entry that a primary node does not have &#8211; by attempting to create a database with a different case than the existing empty database entry.&lt;/p&gt;

&lt;p&gt;To fix this, we can check to see if a database is empty (i.e., no collection entries remain in the catalog) after a collection drop. If it is indeed empty, we can attempt to close the database by locking it in X mode and calling DatabaseHolder::close().&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="904641">DOCS-12980</key>
            <summary>Investigate changes in SERVER-33272: The DatabaseHolder::close() function no longer requires a global write lock and neither does the dropDatabase 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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-onboarding-candidate</label>
                    </labels>
                <created>Fri, 23 Aug 2019 12:20:38 +0000</created>
                <updated>Mon, 13 Nov 2023 18:16:58 +0000</updated>
                            <resolved>Tue, 17 Dec 2019 19:06:42 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.2</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>3</watches>
                                                                                                                <comments>
                            <comment id="2638314" author="xgen-internal-githook" created="Tue, 17 Dec 2019 18:32:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12980&quot; title=&quot;Investigate changes in SERVER-33272: The DatabaseHolder::close() function no longer requires a global write lock and neither does the dropDatabase command.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12980&quot;&gt;&lt;del&gt;DOCS-12980&lt;/del&gt;&lt;/a&gt;: dropDB takes X database lock only&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/335624296af485bec8de6006696ddf6a4703347e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/335624296af485bec8de6006696ddf6a4703347e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2388969" author="ravind.kumar" created="Tue, 27 Aug 2019 15:51:00 +0000"  >&lt;p&gt;Note: SERVER ticket reopened due to build failures. Check status of upstream ticket before starting work. &lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
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                                            <outwardlinks description="documents">
                                        <issuelink>
            <issuekey id="496684">SERVER-33272</issuekey>
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                            <issuelinktype id="10012">
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