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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-79763] Default read concern setting is not being applied to TransactionRouter</title>
                <link>https://jira.mongodb.org/browse/SERVER-79763</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The transaction router extracts the read concern settings &lt;a href=&quot;https://github.com/10gen/mongo/blob/89167aa9473babfec090a26124d649d552369a36/src/mongo/s/transaction_router.cpp#L1507&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; via beginOrContinue. However, in the command processing, we call &lt;a href=&quot;https://github.com/10gen/mongo/blob/89167aa9473babfec090a26124d649d552369a36/src/mongo/s/commands/strategy.cpp#L717&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;beginOrContinue&lt;/a&gt; first, before &lt;a href=&quot;https://github.com/10gen/mongo/blob/89167aa9473babfec090a26124d649d552369a36/src/mongo/s/commands/strategy.cpp#L836&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;applying the default settings to the operation context&apos;s read concern settings&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2409636">SERVER-79763</key>
            <summary>Default read concern setting is not being applied to TransactionRouter</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                    </labels>
                <created>Fri, 4 Aug 2023 20:07:25 +0000</created>
                <updated>Mon, 20 Nov 2023 21:05:22 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5635060" author="max.hirschhorn@10gen.com" created="Tue, 15 Aug 2023 14:46:28 +0000"  >&lt;p&gt;I don&apos;t believe the bug described by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79763&quot; title=&quot;Default read concern setting is not being applied to TransactionRouter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79763&quot;&gt;SERVER-79763&lt;/a&gt; has any user impact from a transaction consistency perspective. This is because both starting a transaction with read concern level &quot;majority&quot; uses &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r7.0.0/src/mongo/db/repl/README.md#read-concern-behavior-within-transactions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;speculative majority behavior&lt;/a&gt; and behaves identically to starting a transaction with read concern level &quot;level&quot;. We should still address the behavior of mongos so that logging for transactions reflects the cluster&amp;#45;wide read concern being used in sharded clusters as would have happened in a replica set.&lt;/p&gt;

&lt;p&gt;As part of making these changes, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79763&quot; title=&quot;Default read concern setting is not being applied to TransactionRouter&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79763&quot;&gt;SERVER-79763&lt;/a&gt; should consider handling read concern level &quot;available&quot; being set as the cluster&amp;#45;wide default specially. This is because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r7.0.0/src/mongo/db/transaction_validation.cpp#L69-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;starting a transaction with read concern level &quot;available&quot; is not permitted&lt;/a&gt; and beginning to reject transactions when read concern level &quot;available&quot; was configured as the cluster&amp;#45;wide default would be harmful for an application on server version upgrade.&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
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            <issuekey id="2409658">SERVER-79766</issuekey>
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            <issuekey id="2391402">SERVER-78949</issuekey>
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