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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-44030] Remove global X lock for mapReduce</title>
                <link>https://jira.mongodb.org/browse/SERVER-44030</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/commands/mr.cpp#L753&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;mapReduce&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="970605">SERVER-44030</key>
            <summary>Remove global X lock for mapReduce</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="3">Duplicate</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
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                <created>Tue, 15 Oct 2019 19:44:28 +0000</created>
                <updated>Tue, 5 Nov 2019 18:45:09 +0000</updated>
                            <resolved>Tue, 5 Nov 2019 18:45:09 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="2518558" author="james.wahlin@10gen.com" created="Tue, 5 Nov 2019 18:45:09 +0000"  >&lt;p&gt;Closing this as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44434&quot; title=&quot;Remove legacy mapReduce command mongod code &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44434&quot;&gt;&lt;del&gt;SERVER-44434&lt;/del&gt;&lt;/a&gt;, under which we will remove the legacy mapReduce implementation from the code base. This will occur early in the 4.5 development cycle.&lt;/p&gt;</comment>
                            <comment id="2506783" author="craig.homa" created="Tue, 29 Oct 2019 15:42:06 +0000"  >&lt;p&gt;James will investigate if there are related tickets that can be linked to this, from which we will determine next steps.&lt;/p&gt;</comment>
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