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    <title>MongoDB Jira</title>
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    <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-21533] Lock manager is not fair in the presence of compatible requests which can be granted immediately</title>
                <link>https://jira.mongodb.org/browse/SERVER-21533</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is code in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.2.0-rc2/src/mongo/db/concurrency/lock_manager.cpp#L738&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;lock manager&lt;/a&gt;, which attempts to increase system throughput in the case of long-running operations holding intent locks.&lt;/p&gt;

&lt;p&gt;This code has the side effect of starving the &apos;strong&apos; locks (S and X) when there is high load and an interleave of intents on the granted list, which is what would happen under a normal stream of requests. This has caused a bug where replication step down won&apos;t complete within the desired timeout.&lt;/p&gt;</description>
                <environment></environment>
        <key id="240062">SERVER-21533</key>
            <summary>Lock manager is not fair in the presence of compatible requests which can be granted immediately</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Nov 2015 19:48:39 +0000</created>
                <updated>Fri, 18 Mar 2016 05:17:37 +0000</updated>
                            <resolved>Wed, 18 Nov 2015 23:27:01 +0000</resolved>
                                    <version>3.0.7</version>
                    <version>3.2.0-rc3</version>
                                    <fixVersion>3.0.8</fixVersion>
                    <fixVersion>3.2.0-rc4</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1095613" author="xgen-internal-githook" created="Mon, 23 Nov 2015 13:14:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21533&quot; title=&quot;Lock manager is not fair in the presence of compatible requests which can be granted immediately&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21533&quot;&gt;&lt;del&gt;SERVER-21533&lt;/del&gt;&lt;/a&gt; Lock manager should not starve requests&lt;/p&gt;

&lt;p&gt;This change makes the lock manager granting code skip granting compatible&lt;br/&gt;
requests if the first entry on the queue is a conflict.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f42a080cc0341d42ea5d5e42aa96366e0d952864)&lt;br/&gt;
Branch: v3.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/19b549b6c2731c4bf288a3cd477bc77e77e9efd3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/19b549b6c2731c4bf288a3cd477bc77e77e9efd3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1092427" author="xgen-internal-githook" created="Wed, 18 Nov 2015 23:25:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21533&quot; title=&quot;Lock manager is not fair in the presence of compatible requests which can be granted immediately&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21533&quot;&gt;&lt;del&gt;SERVER-21533&lt;/del&gt;&lt;/a&gt; Lock manager should not starve requests&lt;/p&gt;

&lt;p&gt;This change makes the lock manager granting code skip granting compatible&lt;br/&gt;
requests if the first entry on the queue is a conflict.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f42a080cc0341d42ea5d5e42aa96366e0d952864&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f42a080cc0341d42ea5d5e42aa96366e0d952864&lt;/a&gt;&lt;/p&gt;</comment>
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