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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-39516] Use database MODE_IX lock for creating collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-39516</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Remove the database &lt;tt&gt;MODE_X&lt;/tt&gt; lock for collection creation.&lt;br/&gt;
Add tests that verify that collection creation no longer blocks on open transactions accessing different collections in the same database.&lt;/p&gt;</description>
                <environment></environment>
        <key id="687932">SERVER-39516</key>
            <summary>Use database MODE_IX lock for creating collections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="xiangyu.yao@mongodb.com">Xiangyu Yao</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Feb 2019 20:54:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:08 +0000</updated>
                            <resolved>Thu, 18 Apr 2019 19:23:30 +0000</resolved>
                                                    <fixVersion>4.1.11</fixVersion>
                                    <component>Catalog</component>
                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3196261" author="geert.bosch" created="Mon, 8 Jun 2020 22:52:30 +0000"  >&lt;p&gt;No, it&apos;s not reasonable or really even possible: you&apos;d end up with something that is much closer to MongoDB 4.2 than MongoDB 4.0.&lt;/p&gt;</comment>
                            <comment id="3156998" author="sergey@stripe.com" created="Mon, 1 Jun 2020 21:21:20 +0000"  >&lt;p&gt;Hello.&#160; Is it possible to backport this change (and related lock relaxations) to v4.0?&#160; Also, if mongoDB is unlikely to do so, I&apos;d appreciate advice on whether it&apos;s reasonable to attempt a private backport.&#160; Thank you!&lt;/p&gt;</comment>
                            <comment id="2218277" author="xgen-internal-githook" created="Thu, 18 Apr 2019 18:59:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;xiangyu.yao@mongodb.com&apos;, &apos;name&apos;: &apos;Xiangyu Yao&apos;, &apos;username&apos;: &apos;xy24&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39516&quot; title=&quot;Use database MODE_IX lock for creating collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39516&quot;&gt;&lt;del&gt;SERVER-39516&lt;/del&gt;&lt;/a&gt; Use database MODE_IX lock for creating collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5ad20825e2c02b14f1aeb5bfb4dcc0b4dce927b2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5ad20825e2c02b14f1aeb5bfb4dcc0b4dce927b2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2205222" author="geert.bosch" created="Mon, 8 Apr 2019 15:31:41 +0000"  >&lt;p&gt;HI Yuri, we understand that these course locks are more of a problem with transactional workloads. We are working toward making our locks more fine grained, as this JIRA issue shows.  We can not give you an ETA, but please watch this ticket for updates. We appreciate your feedback, and use  input such as yours for our planning and scheduling.&lt;/p&gt;</comment>
                            <comment id="2194881" author="ysokolov@informatica.com" created="Thu, 28 Mar 2019 17:18:50 +0000"  >&lt;p&gt;We have encountered this issue while testing our use-case, which consists of concurrent transactional operations by user1, collection DDL operations by user2, and non-transactional find() operation on an unrelated collection by user1.&lt;/p&gt;

&lt;p&gt;We&apos;re experiencing a deadlock because DDL is blocked by an active transaction and non-transactional find executed out-of-transaction is blocked by a DDL.&lt;/p&gt;

&lt;p&gt;As a result we have to work around of this restriction by creating multiple databases in order to avoid the deadlock.&lt;/p&gt;

&lt;p&gt;If you could give us an ETA for this feature that would really help.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
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