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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-37564] remove deadlock detector for lock manager</title>
                <link>https://jira.mongodb.org/browse/SERVER-37564</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is unused since the removal of MMAPv1.&lt;/p&gt;</description>
                <environment></environment>
        <key id="616916">SERVER-37564</key>
            <summary>remove deadlock detector for lock manager</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Oct 2018 13:19:35 +0000</created>
                <updated>Sun, 29 Oct 2023 22:27:29 +0000</updated>
                            <resolved>Fri, 16 Nov 2018 23:44:47 +0000</resolved>
                                                    <fixVersion>4.1.6</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2065453" author="xgen-internal-githook" created="Fri, 16 Nov 2018 23:40:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Geert Bosch&apos;, &apos;email&apos;: &apos;geert@mongodb.com&apos;, &apos;username&apos;: &apos;GeertBosch&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37564&quot; title=&quot;remove deadlock detector for lock manager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37564&quot;&gt;&lt;del&gt;SERVER-37564&lt;/del&gt;&lt;/a&gt; Remove unused deadlock detector&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/26ef13f278e4d19319f11e4738e7bb0001a62d93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/26ef13f278e4d19319f11e4738e7bb0001a62d93&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2031878" author="ian@10gen.com" created="Fri, 12 Oct 2018 19:49:37 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sara.williamson&quot; class=&quot;user-hover&quot; rel=&quot;sara.williamson&quot;&gt;sara.williamson&lt;/a&gt; can you please schedule time for Kal and Geert to discuss this?&lt;/p&gt;</comment>
                            <comment id="2030017" author="kaloian.manassiev" created="Thu, 11 Oct 2018 13:38:16 +0000"  >&lt;p&gt;Yes, but with a small change to make it re-check its assumptions we could make it reliable.&lt;/p&gt;

&lt;p&gt;In sharding for improving the migration concurrency we were considering introducing a per-chunk lock. Not sure if this will materialise, but let&apos;s not remove it at least until we figure out that part.&lt;/p&gt;</comment>
                            <comment id="2030011" author="geert.bosch" created="Thu, 11 Oct 2018 13:34:52 +0000"  >&lt;p&gt;Remember that the deadlock detector actually is not reliable? Because it doesn&apos;t look at the wait-for graph at a fixed point in time, but follows edges one at a time, it can find a deadlock where there in fact is none. As we only used this in a very specific use case for the MMAPv1 flusher, it was not an issue.&lt;/p&gt;

&lt;p&gt;I&apos;m OK with leaving this dead code in a bit longer, but I don&apos;t think we should use it. In storage, we&apos;re working towards removing cases where we need (strong) locks that could create deadlocks. In particular, we don&apos;t want to use strong locks in (sharded) transactions.&lt;/p&gt;</comment>
                            <comment id="2030001" author="kaloian.manassiev" created="Thu, 11 Oct 2018 13:23:19 +0000"  >&lt;p&gt;Is there any reason to remove it right now? I would like to keep it a little bit longer in case we need to actually use it for transactions or sharded transactions.&lt;/p&gt;</comment>
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