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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-44033] Only take the global write lock for applyOps when there are preConditions, multiple DDL commands or nested applyOps</title>
                <link>https://jira.mongodb.org/browse/SERVER-44033</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/repl/apply_ops.cpp#L388&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;applyOps&lt;/tt&gt;&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 command or make sure it won&apos;t be blocked on prepare transactions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="970636">SERVER-44033</key>
            <summary>Only take the global write lock for applyOps when there are preConditions, multiple DDL commands or nested applyOps</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="2">Won&apos;t Fix</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 20:11:37 +0000</created>
                <updated>Fri, 10 Dec 2021 16:47:23 +0000</updated>
                            <resolved>Tue, 5 Nov 2019 19:07:56 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2518604" author="gregory.wlodarek" created="Tue, 5 Nov 2019 19:07:56 +0000"  >&lt;p&gt;After discussing with both &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=geert.bosch&quot; class=&quot;user-hover&quot; rel=&quot;geert.bosch&quot;&gt;geert.bosch&lt;/a&gt;, we have come to the conclusion that the tradeoffs are too risky when trying to remove the global write lock for applyOps.&lt;/p&gt;

&lt;p&gt;Because this is an internal command, users should not be running this during the normal operation of their database. Our tools using this command today do not have any active transactions while running the applyOps commands so we don&apos;t expect them to deadlock.&lt;/p&gt;</comment>
                            <comment id="2516042" author="gregory.wlodarek" created="Mon, 4 Nov 2019 14:57:49 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lingzhi.deng&quot; class=&quot;user-hover&quot; rel=&quot;lingzhi.deng&quot;&gt;lingzhi.deng&lt;/a&gt; we&apos;ve decided to down scope this ticket to what is currently viable while we continue to investigate the remaining work to fully remove the exclusive global lock for applyOps.&lt;/p&gt;

&lt;p&gt;Here&apos;s our plan:&lt;/p&gt;

&lt;p&gt;Continue to take an exclusive global lock if:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;There are multiple DDL commands per &apos;applyOps&apos;.&lt;/li&gt;
	&lt;li&gt;There are nested &apos;applyOps&apos;.&lt;/li&gt;
	&lt;li&gt;There is any &apos;preCondition&apos; specified.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In this ticket, we&apos;ll avoid taking an exclusive global lock if:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;We&apos;re only running CRUD operations.&lt;/li&gt;
	&lt;li&gt;There is only one DDL command in the &apos;applyOps&apos; command.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I&apos;ve linked in the tickets which involve further investigation.&lt;/p&gt;</comment>
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