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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-44022] Fix race in PrepareConflictTracker</title>
                <link>https://jira.mongodb.org/browse/SERVER-44022</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;PrepareConflictTracker&lt;/tt&gt; uses an atomic boolean to indicate that a client is waiting on a prepare conflict, but that does not actually protect the &lt;tt&gt;_prepareConflictDuration&lt;/tt&gt; from being concurrently written to and read from.&lt;/p&gt;

&lt;p&gt;In addition to fixing this race, presumably by using another atomic variable, also make sure that the &lt;tt&gt;endPrepareConflict&lt;/tt&gt; code is a no-op (and does no atomic operations) for cases where there were no prepare conflicts. This is needed because this code is executed for every storage engine level read operation and is therefore very hot, and shows up in profiling information.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="970449">SERVER-44022</key>
            <summary>Fix race in PrepareConflictTracker</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="13201">Fixed</resolution>
                                        <assignee username="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Oct 2019 16:53:52 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:06 +0000</updated>
                            <resolved>Mon, 24 Feb 2020 23:53:14 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Concurrency</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2905977" author="xgen-internal-githook" created="Mon, 24 Feb 2020 21:01:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;GeertBosch&apos;, &apos;name&apos;: &apos;Geert Bosch&apos;, &apos;email&apos;: &apos;geert.bosch@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44022&quot; title=&quot;Fix race in PrepareConflictTracker&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44022&quot;&gt;&lt;del&gt;SERVER-44022&lt;/del&gt;&lt;/a&gt; Fix race in PrepareConflictTracker and speed up happy path&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/21c7a99533a3404bd6c818d8d16df4ea489ad9d0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/21c7a99533a3404bd6c818d8d16df4ea489ad9d0&lt;/a&gt;&lt;/p&gt;</comment>
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