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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-57579] DocumentSourceSequentialCache doesn&apos;t clone, ruining non-correlated $lookup pipeline caching in sharded deployments</title>
                <link>https://jira.mongodb.org/browse/SERVER-57579</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As outlined in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57483&quot; title=&quot;Results from $lookup stage are not cached for a resharding operation&amp;#39;s sub-pipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57483&quot;&gt;&lt;del&gt;SERVER-57483&lt;/del&gt;&lt;/a&gt;, the serialization code isn&apos;t appropriate as a mechanism to clone this stage. We should investigate a more robust way to distinguish the two use cases of serializing to the shards and serializing for being copied. &lt;/p&gt;

&lt;p&gt;The impact of this problem is quite large. It means that your performance of a non-correlated $lookup might degrade when you move from a replica set to a sharded cluster. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1774361">SERVER-57579</key>
            <summary>DocumentSourceSequentialCache doesn&apos;t clone, ruining non-correlated $lookup pipeline caching in sharded deployments</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="3">Duplicate</resolution>
                                        <assignee username="ted.tuckman@mongodb.com">Ted Tuckman</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Jun 2021 16:25:48 +0000</created>
                <updated>Tue, 15 Jun 2021 13:58:11 +0000</updated>
                            <resolved>Tue, 15 Jun 2021 13:58:11 +0000</resolved>
                                    <version>4.4.0</version>
                    <version>5.0.0-rc0</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3878341" author="ted.tuckman" created="Tue, 15 Jun 2021 13:57:38 +0000"  >&lt;p&gt;Closing this in favor of fixing clone() under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57168&quot; title=&quot;pipeline-&amp;gt;clone() breaks on pipelines with union stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57168&quot;&gt;&lt;del&gt;SERVER-57168&lt;/del&gt;&lt;/a&gt;, as resharding will be fixing this case in a linked ticket.&lt;/p&gt;</comment>
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