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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-49290] Support running $lookup locally on shard for config.cache.chunks.* namespaces</title>
                <link>https://jira.mongodb.org/browse/SERVER-49290</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0-rc11/src/mongo/s/catalog/type_chunk.cpp#L47&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The config.cache.chunks.* collections&lt;/a&gt; are created as part of a shard refreshing the metadata (routing table) for a sharded collection. A complete copy of the config.cache.chunks.* collections exist on each shard (they are so-called reference tables). It is therefore always valid for a shard to read from a config.cache.chunks.* namespace locally. (The existing $lookup behavior is to do the merging on the primary shard for the database.)&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0-rc11/src/mongo/db/pipeline/document_source_lookup.cpp#L119-L131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The &lt;tt&gt;from&lt;/tt&gt; parameter to the $lookup stage&lt;/a&gt; should be made to support the following syntax:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;It must be an error to use this new syntax with any namespace other than config.cache.chunks.*&lt;/p&gt;

&lt;p&gt;Additionally, the $lookup stage must not attempt to route the request for config.cache.chunks.* to any other shard, even when the &lt;tt&gt;internalQueryAllowShardedLookup&lt;/tt&gt; server parameter is enabled. Consider generalizing &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0-rc11/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1156&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the check for the local database in the attachCursorToPipeline() function&lt;/a&gt; to be &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0-rc11/src/mongo/db/namespace_string.cpp#L211&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;NamespaceString::isNamespaceAlwaysUnsharded()&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1400126">SERVER-49290</key>
            <summary>Support running $lookup locally on shard for config.cache.chunks.* namespaces</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="haley.connelly@mongodb.com">Haley Connelly</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>PM-234-M2</label>
                            <label>PM-234-T-data-clone</label>
                            <label>query-work-resharding</label>
                    </labels>
                <created>Thu, 2 Jul 2020 14:42:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:06:10 +0000</updated>
                            <resolved>Mon, 10 Aug 2020 16:55:38 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3328808" author="xgen-internal-githook" created="Fri, 7 Aug 2020 22:18:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Haley Connelly&apos;, &apos;email&apos;: &apos;haley.connelly@mongodb.com&apos;, &apos;username&apos;: &apos;haleyConnelly&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49290&quot; title=&quot;Support running $lookup locally on shard for config.cache.chunks.* namespaces&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49290&quot;&gt;&lt;del&gt;SERVER-49290&lt;/del&gt;&lt;/a&gt; Support running $lookup locally on shard for config.cache.chunks.* namespaces&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/426ed301b2e61107e82822764a855feb27168742&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/426ed301b2e61107e82822764a855feb27168742&lt;/a&gt;&lt;/p&gt;</comment>
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                <issuelinks>
                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="1416251">SERVER-49785</issuekey>
        </issuelink>
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