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    <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-75294] Investigate slowness of sharded $lookup</title>
                <link>https://jira.mongodb.org/browse/SERVER-75294</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When both collections are sharded, lookup queries are ~2x slower than for non-sharded collections.&lt;br/&gt;
Let&apos;s understand what is the cause of this impact on performance.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2298264">SERVER-75294</key>
            <summary>Investigate slowness of sharded $lookup</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="3">Duplicate</resolution>
                                        <assignee username="hana.pearlman@mongodb.com">Hana Pearlman</assignee>
                                    <reporter username="kateryna.kamenieva@mongodb.com">Katya Kamenieva</reporter>
                        <labels>
                    </labels>
                <created>Sun, 26 Mar 2023 20:21:00 +0000</created>
                <updated>Mon, 7 Aug 2023 12:38:59 +0000</updated>
                            <resolved>Mon, 7 Aug 2023 12:38:59 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="5612885" author="hana.pearlman" created="Fri, 4 Aug 2023 11:51:02 +0000"  >&lt;p&gt;Belatedly closing this ticket now, because we don&apos;t intend to do any more work on it. The improvement to skip the network for a $lookup subpipeline when a shard is targeting only itself (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77427&quot; title=&quot;Avoid going through the network when a shard is targeting only itself for a $lookup subpipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77427&quot;&gt;&lt;del&gt;SERVER-77427&lt;/del&gt;&lt;/a&gt;) is scheduled to be completed as part of PM-3229, which is in progress now. When that ticket is complete, we expect to see improvements in the targeted perf workloads merged in PERF-4152. Another improvement ticket, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75732&quot; title=&quot;Cache $lookup single solution inner queries when sharded&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75732&quot;&gt;&lt;del&gt;SERVER-75732&lt;/del&gt;&lt;/a&gt;, is intended to be investigated in the next quarter.&lt;/p&gt;</comment>
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