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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-46334] Eliminate the mutex held across JournalListener accesses</title>
                <link>https://jira.mongodb.org/browse/SERVER-46334</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;waitUntilDurable currently &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23b2864a29554c9a27121303b774e80a42200130/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L281&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;holds a mutex across calls&lt;/a&gt; to JournalListener::getToken and JournalListener::onDurable calls. The mutex does not appear necessary for the JournalListener functions. The mutex appears to be for accessing the _journalListener because it can be asynchronously set by another caller via the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23b2864a29554c9a27121303b774e80a42200130/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L519-L522&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setJournalListener&lt;/a&gt; function on the class.&lt;/p&gt;

&lt;p&gt;Removing the mutex will allow the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/23b2864a29554c9a27121303b774e80a42200130/src/mongo/db/storage/wiredtiger/wiredtiger_session_cache.cpp#L269-L270&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;existing promises in the code comments&lt;/a&gt; to become true, which are not currently true because the mutex serializes callers. &lt;/p&gt;

&lt;p&gt;Furthermore, I need to add a write in getToken for the Replicate Before Journaling project, and I don&apos;t want to take a mutex before collection locks: removing the mutex simplifies the code changes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1172079">SERVER-46334</key>
            <summary>Eliminate the mutex held across JournalListener accesses</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Sat, 22 Feb 2020 03:34:13 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:51 +0000</updated>
                            <resolved>Tue, 25 Feb 2020 04:25:01 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2906544" author="xgen-internal-githook" created="Tue, 25 Feb 2020 04:54:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46334&quot; title=&quot;Eliminate the mutex held across JournalListener accesses&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46334&quot;&gt;&lt;del&gt;SERVER-46334&lt;/del&gt;&lt;/a&gt; Eliminate the mutex held across JournalListener calls.&lt;/p&gt;

&lt;p&gt; delete mode 100644 src/mongo/db/storage/journal_listener.cpp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/61ea39197455ca2e54135607e5625bb2c2796ec3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/61ea39197455ca2e54135607e5625bb2c2796ec3&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="996861">SERVER-44555</issuekey>
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                                        <issuelink>
            <issuekey id="2426927">SERVER-80432</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2431829">SERVER-80657</issuekey>
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