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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-34238] Only call waitForReadConcern in the first statement of a multi-statement transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-34238</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="519593">SERVER-34238</key>
            <summary>Only call waitForReadConcern in the first statement of a multi-statement transaction</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="james.wahlin@mongodb.com">James Wahlin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Mar 2018 21:18:57 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:54 +0000</updated>
                            <resolved>Tue, 3 Apr 2018 18:53:29 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1853831" author="tess.avitabile" created="Tue, 3 Apr 2018 18:53:29 +0000"  >&lt;p&gt;We already only call waitForReadConcern for the first statement in a transaction, since we do it before unstashing the readConcern for the transaction. Even if a later command in the transaction specifies a readConcern and we waitForReadConcern, we will not be in a WUOW while waiting (and we will reject the command during unstashing).&lt;/p&gt;</comment>
                            <comment id="1853282" author="james.wahlin@10gen.com" created="Tue, 3 Apr 2018 13:29:49 +0000"  >&lt;p&gt;The problem originally reported by this ticket is longer an issue for snapshot reads as of &lt;a href=&quot;https://github.com/mongodb/mongo/commit/c5ce37e6281a41b46d26163272aec4a00eb9ea2c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this commit&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;I suspect the referenced call to waitForReadConcern() may still be an issue for multi-statement transactions however. The call to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f1bb8e1389d6aa458e5100f3eb753b80b1a4e4e7/src/mongo/db/service_entry_point_common.cpp#L721&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;waitForReadConcern() here&lt;/a&gt; makes use of the OperationContext ReadConcernArgs decoration prior to us unstashing the transaction&apos;s ReadConcernArgs object. As only the first statement in a multi-statement transaction provides readConcern information, this will be wrong for every statement beyond the first. I suspect we should only call waitForReadConcern() when running the first statement of a multi-statement transaction.&lt;/p&gt;

&lt;p&gt;Repurposing ticket and sending to the Repl team to triage.&lt;/p&gt;</comment>
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