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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-56600] Make DDL coordinators not wait for DistLock in the coordinator&apos;s thread pool</title>
                <link>https://jira.mongodb.org/browse/SERVER-56600</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently sharding DDL coordinators &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3d62d53403edf06f3eaee84913dd6571a9af1132/src/mongo/db/s/sharding_ddl_coordinator.cpp#L128-L163&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attempt to acquire dist-locks in their construction phase&lt;/a&gt;. This is blocking work that depends on other coordinators to complete. Since all the coordinators use the same shared threadpool we can end-up with the following deadlock on thread acquisition:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;coordinator 1 waits on the dist-locks acquisition without yelding his threads (T1)&lt;/li&gt;
	&lt;li&gt;coordinator 2 waits on (T1) to be available in other to release the distlock.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56599&quot; title=&quot;Make ShardingDDLCoordinatorService threadpool size unlimited &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56599&quot;&gt;&lt;del&gt;SERVER-56599&lt;/del&gt;&lt;/a&gt; the threadpool size used by the ShardingDDLCoordinatorService has been made of unlimited size due to several bugs.&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to make it capped again once all the related bugs have been solved.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1700390">SERVER-56600</key>
            <summary>Make DDL coordinators not wait for DistLock in the coordinator&apos;s thread pool</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>sharding-wfbf-sprint</label>
                    </labels>
                <created>Tue, 4 May 2021 12:23:04 +0000</created>
                <updated>Tue, 6 Dec 2022 01:21:12 +0000</updated>
                            <resolved>Fri, 13 Aug 2021 12:06:51 +0000</resolved>
                                    <version>Backlog</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3999207" author="tommaso.tocci" created="Fri, 13 Aug 2021 12:06:51 +0000"  >&lt;p&gt;We won&apos;t be able to do this until we will have a non-blocking API for distLock or local lock acquisition.&lt;/p&gt;</comment>
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