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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-58376] Perform local read when $lookup into unsharded coll is on primary shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-58376</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently when run on a shard server, a $lookup will target shards to attach a cursor source regardless of whether the &apos;from&apos; collection is sharded or unsharded. This is because, if the source collection is sharded and the &apos;from&apos; collection is unsharded, the $lookup could be running on a non-primary shard and must target the primary (where the &apos;from&apos; collection lives) to get correct results. However, if the $lookup is running on the primary shard of the database and the &apos;from&apos; collection is unsharded, it is safe to perform local reads instead of targeting shards.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1812282">SERVER-58376</key>
            <summary>Perform local read when $lookup into unsharded coll is on primary shard</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="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="katherine.wu@mongodb.com">Katherine Wu</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Jul 2021 19:30:18 +0000</created>
                <updated>Sun, 29 Oct 2023 21:51:09 +0000</updated>
                            <resolved>Thu, 30 Sep 2021 16:38:48 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4107650" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:32:23 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4094641" author="xgen-internal-githook" created="Thu, 30 Sep 2021 16:35:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Hana Pearlman&apos;, &apos;email&apos;: &apos;hana.pearlman@mongodb.com&apos;, &apos;username&apos;: &apos;HanaPearlman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58376&quot; title=&quot;Perform local read when $lookup into unsharded coll is on primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58376&quot;&gt;&lt;del&gt;SERVER-58376&lt;/del&gt;&lt;/a&gt;: Perform local reads when on the primary reading from an unsharded coll&lt;/p&gt;

&lt;p&gt;Co-authored-by: Alya Carina Berciu alya.berciu@mongodb.com&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c4a4bb88aa29b8edb42690bf123a43d72a4c621&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c4a4bb88aa29b8edb42690bf123a43d72a4c621&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4016794" author="katherine.wu" created="Mon, 23 Aug 2021 14:17:04 +0000"  >&lt;p&gt;Reopening to address this optimization as part of this project, as&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58727&quot; title=&quot;Perform local operation when AsyncRequestsSender only targets local shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58727&quot;&gt;&lt;del&gt;SERVER-58727&lt;/del&gt;&lt;/a&gt; may not be possible to do from the sharding side (ex. difficulty for mirrored reads).&lt;/p&gt;</comment>
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