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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-32629] $lookup misses results when both the mongos and primary shard are unaware that an involved collection is sharded</title>
                <link>https://jira.mongodb.org/browse/SERVER-32629</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Found while working on test cases for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32308&quot; title=&quot;Add the ability for a $lookup stage to execute on mongos against a sharded foreign collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32308&quot;&gt;&lt;del&gt;SERVER-32308&lt;/del&gt;&lt;/a&gt;. Repro steps:&lt;/p&gt;

&lt;p&gt;1. Create unsharded local and foreign collections, inserting a few documents to each.&lt;br/&gt;
2. Shard either collection through the first mongos, and ensure that the chunks are distributed across multiple shards. &lt;br/&gt;
3. Restart the primary shard to reset its metadata. It now believes that both collections are unsharded.&lt;br/&gt;
4. Send $lookup to a second mongos, which is unaware that either collection is sharded.&lt;/p&gt;</description>
                <environment></environment>
        <key id="481113">SERVER-32629</key>
            <summary>$lookup misses results when both the mongos and primary shard are unaware that an involved collection is sharded</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Jan 2018 16:46:34 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:42 +0000</updated>
                            <resolved>Wed, 22 Apr 2020 06:34:05 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3050454" author="kaloian.manassiev" created="Wed, 22 Apr 2020 06:34:05 +0000"  >&lt;p&gt;This issue is now gone away as a result of the changes done under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47556&quot; title=&quot;AutoGetCollectionForReadCommand: Convert usages of checkShardVersionOrThrow_DEPRECATED to checkShardVersionOrThrow&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47556&quot;&gt;&lt;del&gt;SERVER-47556&lt;/del&gt;&lt;/a&gt; and the respective test &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/sharding/query/lookup_mongod_unaware.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;lookup_mongod_unaware.js&lt;/a&gt; has been updated.&lt;/p&gt;</comment>
                            <comment id="1770930" author="kaloian.manassiev" created="Wed, 10 Jan 2018 23:00:42 +0000"  >&lt;p&gt;I think it should stay open so that the respective tests can be written, once the dependent bug is fixed.&lt;/p&gt;</comment>
                            <comment id="1770925" author="schwerin" created="Wed, 10 Jan 2018 22:57:39 +0000"  >&lt;p&gt;So, close as duplicate?&lt;/p&gt;</comment>
                            <comment id="1770561" author="kaloian.manassiev" created="Wed, 10 Jan 2018 18:54:04 +0000"  >&lt;p&gt;This scenario is not limited to $lookup only. I believe any query will encounter the same problem. &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; will take care of this, yes.&lt;/p&gt;</comment>
                            <comment id="1770513" author="esha.maharishi@10gen.com" created="Wed, 10 Jan 2018 18:21:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;, will this be solved once shards have an &quot;unknown&quot; metadata state?&lt;/p&gt;</comment>
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            <issuekey id="1315854">SERVER-47556</issuekey>
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