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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-39016] Make sharded $lookup queries run on non-primary shards able to target the primary shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-39016</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38728&quot; title=&quot;Allow pipeline with $lookup into a sharded collection to run on mongod&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38728&quot;&gt;&lt;del&gt;SERVER-38728&lt;/del&gt;&lt;/a&gt;, when a $lookup query is run on a mongod, and the collection is unsharded, we&apos;ll assume that we can get the correct results by doing a local read. However, if the mongod is not the primary shard, this will lead to us returning incorrect (empty) results. Instead, we should add logic to send the query to the primary shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="672875">SERVER-39016</key>
            <summary>Make sharded $lookup queries run on non-primary shards able to target the 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="13203">Gone away</resolution>
                                        <assignee username="katherine.wu@mongodb.com">Katherine Wu</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Jan 2019 19:38:47 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:03 +0000</updated>
                            <resolved>Mon, 12 Jul 2021 13:51:47 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3928009" author="katherine.wu" created="Mon, 12 Jul 2021 13:51:47 +0000"  >&lt;p&gt;Closing this as &quot;Gone Away&quot;, since we currently don&apos;t do a local read in the unsharded case, and always follow the shard-targeting path.&#160;&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; will track the optimization for local reads when it is possible to ensure the shard we&apos;re on is the primary and the &apos;from&apos; collection is unsharded.&lt;/p&gt;</comment>
                            <comment id="2141460" author="ian.boros" created="Thu, 7 Feb 2019 18:51:26 +0000"  >&lt;p&gt;Putting this back on the backlog since my patch build revealed some issues and we&apos;ve stopped work on this project.&lt;/p&gt;</comment>
                            <comment id="2125803" author="james.wahlin@10gen.com" created="Thu, 24 Jan 2019 14:52:13 +0000"  >&lt;p&gt;It is possible that we will want to do &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39015&quot; title=&quot;Make local reads for $lookup/$graphLookup (on unsharded collections) provide a shard version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39015&quot;&gt;&lt;del&gt;SERVER-39015&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38758&quot; title=&quot;Avoid restarting $lookup from the top if a stale version error is encountered during a single lookup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38758&quot;&gt;&lt;del&gt;SERVER-38758&lt;/del&gt;&lt;/a&gt; prior to this ticket. We should clarify as well what additional work would be needed here (if any) once those are in place.&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="658989">SERVER-38728</issuekey>
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                                                                <inwardlinks description="is depended on by">
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            <issuekey id="677543">SERVER-39179</issuekey>
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            <issuekey id="679767">SERVER-39270</issuekey>
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            <issuekey id="1815625">SERVER-58445</issuekey>
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