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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-80498] Improve thread safety of ReadConcernArgs modification</title>
                <link>https://jira.mongodb.org/browse/SERVER-80498</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a harmless race between a thread performing an operation using DBDirectClient that temporarily resets the ReadConcernArgs (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e2674b6d474f5eabde5eb44e6a8396ccb6d6fc53/src/mongo/db/transaction/transaction_participant.cpp#L284&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;example&lt;/a&gt;) and the currentOps method reading the ReadConcernArgs of the target operation (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e2674b6d474f5eabde5eb44e6a8396ccb6d6fc53/src/mongo/db/transaction/transaction_participant.cpp#L2552&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;code&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;The main risk potential for this is an operation printing potentially wrong information for the read concern used. This would occur if the currentOp thread acquired a copy of the data while the temporary reset was happening.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2429148">SERVER-80498</key>
            <summary>Improve thread safety of ReadConcernArgs modification</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="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                    </labels>
                <created>Tue, 29 Aug 2023 16:22:31 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:57 +0000</updated>
                            <resolved>Mon, 4 Sep 2023 10:16:21 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5677614" author="xgen-internal-githook" created="Mon, 4 Sep 2023 10:07:04 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80498&quot; title=&quot;Improve thread safety of ReadConcernArgs modification&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80498&quot;&gt;&lt;del&gt;SERVER-80498&lt;/del&gt;&lt;/a&gt; Make a copy of ReadConcernArgs for monitoring at the start of a transaction&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5f834a1b13c2081164a06fa34ae62dba4202f6f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c5f834a1b13c2081164a06fa34ae62dba4202f6f&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>$currentOp output for multi-document transactions used to display the actual readConcern being used. In some cases this could lead to intermittent instances of an operation displaying a different readConcern than the user-provided due to internal operations that temporarily changed it.&lt;br/&gt;
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With the merged ticket, $currentOp will now display the user-provided readConcern without the possibility of intermittent changes. </customfieldvalue>

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