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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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-38441] In-Memory pins all dirty data in cache because of read concern majority</title>
                <link>https://jira.mongodb.org/browse/SERVER-38441</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;By default, the In-Memory storage engine runs into read concern majority cache problems. If read concern majority is not explicitly disabled at startup, all dirty data remains pinned in cache because In-Memory never commits the data as the normal WiredTiger engine does.&lt;/p&gt;

&lt;p&gt;Default settings:&lt;br/&gt;
 &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/202936/202936_Screen+Shot+2018-12-06+at+3.39.57+PM.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;&lt;tt&gt;--enableMajorityReadConcern false&lt;/tt&gt;:&lt;br/&gt;
 &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/202935/202935_Screen+Shot+2018-12-06+at+3.41.05+PM.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt; &lt;/p&gt;</description>
                <environment></environment>
        <key id="646249">SERVER-38441</key>
            <summary>In-Memory pins all dirty data in cache because of read concern majority</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="13202">Works as Designed</resolution>
                                        <assignee username="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="daniel.hatcher@mongodb.com">Danny Hatcher</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Dec 2018 21:06:43 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:23 +0000</updated>
                            <resolved>Tue, 18 Dec 2018 15:24:11 +0000</resolved>
                                    <version>3.6.9</version>
                    <version>4.0.4</version>
                                                    <component>Replication</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="2094395" author="daniel.hatcher" created="Tue, 18 Dec 2018 15:24:02 +0000"  >&lt;p&gt;This cache pinning is the result of &lt;a href=&quot;https://docs.mongodb.com/manual/reference/replica-configuration/#rsconf.writeConcernMajorityJournalDefault&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt;&lt;/a&gt; being set to true when using the default replica set configuration. Per the documentation, this config value should be set to &lt;tt&gt;false&lt;/tt&gt; if any member of the replica set is using the In-Memory storage engine.&lt;/p&gt;

&lt;p&gt;Opened &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38685&quot; title=&quot;Startup warning if In-Memory SE is used and writeConcernMajorityJournalDefault is true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38685&quot;&gt;&lt;del&gt;SERVER-38685&lt;/del&gt;&lt;/a&gt; to discuss adding a startup warning.&lt;/p&gt;</comment>
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            <issuekey id="656681">SERVER-38685</issuekey>
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                            <attachment id="202935" name="Screen Shot 2018-12-06 at 3.41.05 PM.png" size="93327" author="daniel.hatcher@mongodb.com" created="Thu, 6 Dec 2018 20:41:13 +0000"/>
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                            <customfieldvalue>&lt;p&gt;1. Launch a replica set using the In-Memory storage engine without explicitly disabling read concern majority.&lt;br/&gt;
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