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    <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-39015] Make local reads for $lookup/$graphLookup (on unsharded collections) provide a shard version</title>
                <link>https://jira.mongodb.org/browse/SERVER-39015</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;, if we find a collection is unsharded, we will just perform a local read on it (with no shard versioning). We should change this to deal with cases where the collection becomes sharded. Depending on how we do the &quot;is the collection sharded&quot; check, this may also be needed to deal with the case where the collection exists (and is not sharded) but is on a different shard.&lt;/p&gt;</description>
                <environment></environment>
        <key id="672853">SERVER-39015</key>
            <summary>Make local reads for $lookup/$graphLookup (on unsharded collections) provide a shard version</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 19:09:58 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:03 +0000</updated>
                            <resolved>Wed, 7 Jul 2021 20:20:33 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3921619" author="katherine.wu" created="Wed, 7 Jul 2021 20:20:33 +0000"  >&lt;p&gt;Closing as &quot;Gone Away&quot;. After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45526&quot; title=&quot;Support union with sharded collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45526&quot;&gt;&lt;del&gt;SERVER-45526&lt;/del&gt;&lt;/a&gt;, we don&apos;t do a local read and will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a21d8af14daec2222f7038b9a5756f5b87223076/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1285&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;target shards&lt;/a&gt; even if the &apos;from&apos; collection is unsharded, since we might not be on the primary shard. This fixes the race condition where the &apos;from&apos; collection suddenly becomes sharded.&lt;/p&gt;</comment>
                            <comment id="2125735" author="james.wahlin@10gen.com" created="Thu, 24 Jan 2019 14:15:56 +0000"  >&lt;p&gt;As part of this work, we should determine whether we can address &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32629&quot; title=&quot;$lookup misses results when both the mongos and primary shard are unaware that an involved collection is sharded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32629&quot;&gt;&lt;del&gt;SERVER-32629&lt;/del&gt;&lt;/a&gt;. It is possible that we won&apos;t and will have to wait for delivery of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32198&quot; title=&quot;Missing collection metadata on the shard implies both UNSHARDED and &amp;quot;metadata not loaded yet&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32198&quot;&gt;&lt;del&gt;SERVER-32198&lt;/del&gt;&lt;/a&gt; to address but we should confirm.&lt;/p&gt;</comment>
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            <issuekey id="658989">SERVER-38728</issuekey>
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            <issuekey id="343865">SERVER-27616</issuekey>
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