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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-86278] Investigate discrepancy between ShardLocal and ShardRemote aggregations</title>
                <link>https://jira.mongodb.org/browse/SERVER-86278</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The ShardLocal aggregations code ends up calling RSLocalClient. This code ends up &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ad2d6e80d60ce2198a7711828f7e619a0baf3c2f/src/mongo/db/rs_local_client.cpp#L232&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;overriding the readConcern given to the command&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The readConcern given as a result would crash the server if snapshot readConcern is used since the override would swap &lt;tt&gt;afterClusterTime&lt;/tt&gt; with &lt;tt&gt;afterOpTime&lt;/tt&gt;. When processing the request, the server would also add a &lt;tt&gt;atClusterTime&lt;/tt&gt; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ad2d6e80d60ce2198a7711828f7e619a0baf3c2f/src/mongo/db/read_concern_mongod.cpp#L451&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;since it uses snapshot readConcern&lt;/a&gt;. This will cause &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ad2d6e80d60ce2198a7711828f7e619a0baf3c2f/src/mongo/db/repl/replication_coordinator_impl.cpp#L1919&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this invariant&lt;/a&gt; to get hit since both arguments will be set.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2568424">SERVER-86278</key>
            <summary>Investigate discrepancy between ShardLocal and ShardRemote aggregations</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="12452" iconUrl="https://jira.mongodb.org/images/icons/statuses/generic.png" description="">Needs Scheduling</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
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                    </labels>
                <created>Tue, 6 Feb 2024 15:27:04 +0000</created>
                <updated>Wed, 7 Feb 2024 01:01:27 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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