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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-81233] Prevent kickback to router when reading from views on unsplittable collections located on the db-primary</title>
                <link>https://jira.mongodb.org/browse/SERVER-81233</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When reading from a view, mongos will first target the db-primary shard (where view definitions live). The shard will then resolve the view and either:&lt;br/&gt;
a) Execute the read on the underlying collection locally, if the underlying collection is UNSHARDED (i.e. untracked).&lt;br/&gt;
b) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c556d80f28d51179d78b3f6b3f1ffb53b676b0b2/src/mongo/db/commands/run_aggregate.cpp#L793-L794&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;kick back&quot; to mongos&lt;/a&gt;, so that mongos retargets the read as an aggregation directly on the underlying collection.&lt;/p&gt;

&lt;p&gt;We must preserve the optimized path (a) for unsplittable collections that live on the db-primary shard. Currently the optimization is not kept because we only attempt local read &lt;a href=&quot;https://github.com/mongodb/mongo/blob/be38579dc72a40988cada1f43ab6695dcff8cc36/src/mongo/db/commands/run_aggregate.cpp#L772-L775&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when the collection in untracked.&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2446737">SERVER-81233</key>
            <summary>Prevent kickback to router when reading from views on unsplittable collections located on the db-primary</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Sep 2023 10:21:13 +0000</created>
                <updated>Wed, 24 Jan 2024 17:17:05 +0000</updated>
                            <resolved>Mon, 20 Nov 2023 10:55:50 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5891761" author="xgen-internal-githook" created="Mon, 20 Nov 2023 10:32:08 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81233&quot; title=&quot;Prevent kickback to router when reading from views on unsplittable collections located on the db-primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81233&quot;&gt;&lt;del&gt;SERVER-81233&lt;/del&gt;&lt;/a&gt; Prevent kickback to router when reading from views on unsplittable collections located on the db-primary&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b22f59b7930d2c44be6b2a7ff5251a210d7e189d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b22f59b7930d2c44be6b2a7ff5251a210d7e189d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2553827">SERVER-85583</issuekey>
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