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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-42459] Implement a lock acquisition graph type</title>
                <link>https://jira.mongodb.org/browse/SERVER-42459</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implement a library which provides access to a lock acquisition graph type.&lt;/p&gt;

&lt;p&gt;That type should provide:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;methods which can be invoked from a mutex&apos;s lock and unlock calls that update its internal notion of process/system-wide lock acquisition.&lt;/li&gt;
	&lt;li&gt;some method to dump it&apos;s internal map&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should probably also consider how to manage updating a graph without serializing all lock access in the system.  (perhaps through an api which allows ingestion of a smaller graph from a larger one.  That kind of scheme might let us update a thread local graph live, and only sync to the global graph at client destruction / global shutdown).&lt;/p&gt;</description>
                <environment></environment>
        <key id="877063">SERVER-42459</key>
            <summary>Implement a lock acquisition graph type</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                    </labels>
                <created>Fri, 26 Jul 2019 20:19:39 +0000</created>
                <updated>Tue, 6 Dec 2022 02:52:28 +0000</updated>
                            <resolved>Tue, 12 Nov 2019 17:18:33 +0000</resolved>
                                                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2536971" author="ben.caimano" created="Tue, 12 Nov 2019 17:18:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=rahul.sundararaman&quot; class=&quot;user-hover&quot; rel=&quot;rahul.sundararaman&quot;&gt;rahul.sundararaman&lt;/a&gt; has mostly covered this one via &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42897&quot; title=&quot;Validate base-level latches&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42897&quot;&gt;&lt;del&gt;SERVER-42897&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2347577" author="kaloian.manassiev" created="Mon, 29 Jul 2019 12:00:46 +0000"  >&lt;p&gt;When working on this, please note that there is already a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f07dc437755cb16d9bf131cc31c135497ead38fd/src/mongo/db/concurrency/lock_manager.h#L233&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;deadlock detector&lt;/a&gt;, which we implemented for the lock manager and it used to be utilized for a particular MMAP V1 deadlock, which was happening. It got deleted when we removed the MMAP V1 storage engine, but it would be nice if it could be of use for this project.&lt;/p&gt;</comment>
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