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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31763] Post-change lookup uasserts for sharded collection on single-shard cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-31763</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In cases where an aggregation on a sharded collection can be targeted to a single shard, we simply forward the pipeline to that shard and store the resulting cursor on the &lt;tt&gt;mongoS&lt;/tt&gt;. Aggregations which start with &lt;tt&gt;$changeStream&lt;/tt&gt; are targeted at all shards, but on a single-shard cluster this means that the entire pipeline will be forwarded, unsplit, to that shard. When we then &lt;a href=&quot;https://github.com/mongodb/mongo/blob/db64381873afebf1532a0fd576499f72da00b703/src/mongo/db/pipeline/pipeline_d.cpp#L384-L403&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;attempt to lookup the post-change image&lt;/a&gt;, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/db64381873afebf1532a0fd576499f72da00b703/src/mongo/db/pipeline/pipeline_d.cpp#L254-L257&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;hit the &lt;tt&gt;uassert&lt;/tt&gt; here&lt;/a&gt; which prevents &lt;tt&gt;MongodProcessInterface&lt;/tt&gt; from creating an internal pipeline on a collection that is sharded.&lt;/p&gt;</description>
                <environment></environment>
        <key id="452557">SERVER-31763</key>
            <summary>Post-change lookup uasserts for sharded collection on single-shard cluster</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="13201">Fixed</resolution>
                                        <assignee username="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bernard.gorman@mongodb.com">Bernard Gorman</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Oct 2017 10:37:05 +0000</created>
                <updated>Mon, 30 Oct 2023 23:10:53 +0000</updated>
                            <resolved>Thu, 9 Nov 2017 21:04:00 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1722019" author="xgen-internal-githook" created="Thu, 9 Nov 2017 21:02:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Bernard Gorman&apos;, &apos;username&apos;: &apos;gormanb&apos;, &apos;email&apos;: &apos;bernard.gorman@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31763&quot; title=&quot;Post-change lookup uasserts for sharded collection on single-shard cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31763&quot;&gt;&lt;del&gt;SERVER-31763&lt;/del&gt;&lt;/a&gt; $changeStream on sharded collections must always split on mongoS even if targeting a single shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/862958d49fc7c19d2d74a5e1ad25c3a5c4a4cd16&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/862958d49fc7c19d2d74a5e1ad25c3a5c4a4cd16&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="440626">SERVER-31394</issuekey>
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