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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>[SERVER-40952] Release the DB X lock in createIndexes after creating the collection/database</title>
                <link>https://jira.mongodb.org/browse/SERVER-40952</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a7d030a0710e4ae3f380fc794de58a82a8527a9/src/mongo/db/commands/create_indexes.cpp#L255&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;First we take the DB lock in MODE_IX&lt;/a&gt;, then if the collection doesn&apos;t exist yet, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a7d030a0710e4ae3f380fc794de58a82a8527a9/src/mongo/db/commands/create_indexes.cpp#L285&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;relock the DB in MODE_X in case we need to create the database as well&lt;/a&gt; for collection creation. However, we never relock the DB in MODE_IX after the collection is created. We end up holding the MODE_X for the duration of the createIndexes cmd in this scenario. Need to change it to relock in MODE_IX afterwards in both the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a7d030a0710e4ae3f380fc794de58a82a8527a9/src/mongo/db/commands/create_indexes.cpp#L236&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;runCreateIndexes&lt;/a&gt; function &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2a7d030a0710e4ae3f380fc794de58a82a8527a9/src/mongo/db/commands/create_indexes.cpp#L474&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;runCreateIndexesWithCoordinator&lt;/a&gt; function.&lt;/p&gt;</description>
                <environment></environment>
        <key id="754647">SERVER-40952</key>
            <summary>Release the DB X lock in createIndexes after creating the collection/database</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 May 2019 23:23:43 +0000</created>
                <updated>Tue, 6 Dec 2022 03:00:21 +0000</updated>
                            <resolved>Wed, 27 Nov 2019 19:34:05 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2570749" author="maria.vankeulen" created="Wed, 27 Nov 2019 19:34:05 +0000"  >&lt;p&gt;The work for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44405&quot; title=&quot;Use MODE_IX lock for implicit collection creation with createIndexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44405&quot;&gt;&lt;del&gt;SERVER-44405&lt;/del&gt;&lt;/a&gt; includes removing the MODE_X collection lock acquisition (the MODE_X db lock was removed in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43858&quot; title=&quot;Use MODE_IX instead of MODE_X db lock for creating collection in new db&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43858&quot;&gt;&lt;del&gt;SERVER-43858&lt;/del&gt;&lt;/a&gt;) when createIndexes implicitly creates a collection.&lt;/p&gt;</comment>
                            <comment id="2234093" author="dianna.hohensee" created="Fri, 3 May 2019 18:46:20 +0000"  >&lt;p&gt;We will have to be careful to create the collection before testing concurrent index builds. I tried pausing an index build via failpoint and parallel shell, then ran a second request: the second request hung earlier than anticipated because the first build request was holding a X lock instead of an IX.&lt;/p&gt;

&lt;p&gt;Maybe it isn&apos;t a common test paradigm, at the moment.&lt;/p&gt;</comment>
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