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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-44028] Remove global X lock for Cloner</title>
                <link>https://jira.mongodb.org/browse/SERVER-44028</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Remove global X lock acquisition for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8d5fc650b1c3a38a9d4630a48fe856eba56d6171/src/mongo/db/cloner.cpp#L105&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Cloner&lt;/a&gt;. This is because acquiring global lock in X mode can be blocked by prepared transactions. The enqueued global X lock can block oplog queries which need the global IS lock. If these oplog queries and the data replication are needed to satisfy the prepared transaction&apos;s write concern, then the prepare transaction and replication cannot make progress. Thus a deadlock occurs.&lt;/p&gt;

&lt;p&gt;Alternatively, if removing global X lock is not an option, deprecate the usage or make sure it won&apos;t be blocked on prepare transactions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="970597">SERVER-44028</key>
            <summary>Remove global X lock for Cloner</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Oct 2019 19:39:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:05 +0000</updated>
                            <resolved>Fri, 1 Nov 2019 14:31:12 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.2.2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2548074" author="xgen-internal-githook" created="Mon, 18 Nov 2019 23:25:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;name&apos;: &apos;Gregory Wlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44028&quot; title=&quot;Remove global X lock for Cloner&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44028&quot;&gt;&lt;del&gt;SERVER-44028&lt;/del&gt;&lt;/a&gt; Remove global X lock for Cloner&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 6e1889fb793e1927a5ca695c8839f9184e5d8aa4)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eb4706d4f2fff6fa87197bb7e8d6de2c0c1b49c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eb4706d4f2fff6fa87197bb7e8d6de2c0c1b49c9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2513978" author="xgen-internal-githook" created="Fri, 1 Nov 2019 14:10:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;name&apos;: &apos;Gregory Wlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44028&quot; title=&quot;Remove global X lock for Cloner&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44028&quot;&gt;&lt;del&gt;SERVER-44028&lt;/del&gt;&lt;/a&gt; Remove global X lock for Cloner&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6e1889fb793e1927a5ca695c8839f9184e5d8aa4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6e1889fb793e1927a5ca695c8839f9184e5d8aa4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2495464" author="milkie" created="Tue, 22 Oct 2019 16:08:19 +0000"  >&lt;p&gt;The Cloner is currently used by rollback-via-refetch and by the movePrimary command.&lt;br/&gt;
Rollback-via-refetch has no danger of deadlock with prepared transactions.&lt;br/&gt;
The movePrimary command does have a danger of deadlock.  I recommend changing the Global lock to a Database X lock.  The command already acquires a DB X lock prior to calling the Cloner, so this change seems safe to make and should have no effect on movePrimary.&lt;/p&gt;</comment>
                            <comment id="2485649" author="milkie" created="Wed, 16 Oct 2019 20:18:54 +0000"  >&lt;p&gt;// XXX: can probably take dblock instead&lt;/p&gt;</comment>
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