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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-25441] $lookup does not respect readConcern when aggregation on sharded collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-25441</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When an aggregation is run against a sharded collection with a  $lookup stage, the merging shard that will perform the $lookup &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.3.9/src/mongo/s/commands/cluster_pipeline_cmd.cpp#L245&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does not get propagated information about which readConcern was requested&lt;/a&gt;.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="306507">SERVER-25441</key>
            <summary>$lookup does not respect readConcern when aggregation on sharded collection</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="james.wahlin@mongodb.com">James Wahlin</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 Aug 2016 14:56:02 +0000</created>
                <updated>Sat, 19 Nov 2016 00:04:47 +0000</updated>
                            <resolved>Thu, 3 Nov 2016 18:43:44 +0000</resolved>
                                    <version>3.2.8</version>
                    <version>3.3.10</version>
                                    <fixVersion>3.4.0-rc3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1425463" author="xgen-internal-githook" created="Thu, 3 Nov 2016 18:43:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jameswahlin&apos;, u&apos;name&apos;: u&apos;James Wahlin&apos;, u&apos;email&apos;: u&apos;james.wahlin@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25441&quot; title=&quot;$lookup does not respect readConcern when aggregation on sharded collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25441&quot;&gt;&lt;del&gt;SERVER-25441&lt;/del&gt;&lt;/a&gt; $lookup on a sharded coll does not respect readConcern&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/481ad0d0a876f43da0ccfd5ba4e9c81a583c1dac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/481ad0d0a876f43da0ccfd5ba4e9c81a583c1dac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1422101" author="james.wahlin@10gen.com" created="Mon, 31 Oct 2016 18:20:30 +0000"  >&lt;p&gt;On review, $lookup does respect readConcern and is validated by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc2/jstests/noPassthrough/read_committed_lookup.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;readCommitted_lookup.js&lt;/a&gt;. Tests are performed against both a replica set and a cluster with unsharded collections.&lt;/p&gt;

&lt;p&gt;The concern that readConcern is not passed to the merging shard (when running against a sharded collection) is valid. I modified the cluster test in readCommitted_lookup.js to run against a sharded local collection. This fails and the $mergeCursors command is run without the specified readConcern.&lt;/p&gt;</comment>
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