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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-82566] Try to avoid call to cluster_aggregation_planner::getCollationAndUUID </title>
                <link>https://jira.mongodb.org/browse/SERVER-82566</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a sharded environment, the throughput of an aggregation {$match: {_id: x}} is slower than the throughput of the equivalent find command by a factor of about 25X. I&apos;ve attached flamegraphs to compare those 2 workloads.&lt;/p&gt;

&lt;p&gt;In the agg case, 91% of the time is spent in cluster_aggregation_planner::getCollationAndUUID since it has to execute a remote call to the primary shard to retrieve that metadata. We believe that, at least in cases when we&apos;re only parsing the pipeline for the sake of query stats, the uuid is optional and the collation can be a default empty object. We should try to avoid that call so the cluster_aggregate IDHack isn&apos;t bottlenecked there.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2485535">SERVER-82566</key>
            <summary>Try to avoid call to cluster_aggregation_planner::getCollationAndUUID </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="backlog-query-integration">Backlog - Query Integration</assignee>
                                    <reporter username="will.buerger@mongodb.com">Will Buerger</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Oct 2023 15:26:05 +0000</created>
                <updated>Mon, 6 Nov 2023 15:15:31 +0000</updated>
                            <resolved>Mon, 6 Nov 2023 15:15:31 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5857213" author="JIRAUSER1260438" created="Mon, 6 Nov 2023 15:15:31 +0000"  >&lt;p&gt;This was resolved by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80145&quot; title=&quot;Avoid explicit callers of ChunkManager::dbPrimary() when doing shard targeting in agg code&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80145&quot;&gt;&lt;del&gt;SERVER-80145&lt;/del&gt;&lt;/a&gt;. Performance numbers on IDHack workloads show that OperationThroughput on sharded variants has changed as expected from ~1,000 to ~20,000.&lt;/p&gt;</comment>
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            <issuekey id="2442202">SERVER-85082</issuekey>
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                <attachments>
                            <attachment id="486123" name="flamegraph_agg_idhack.svg" size="1288579" author="will.buerger@mongodb.com" created="Mon, 30 Oct 2023 15:23:28 +0000"/>
                            <attachment id="486122" name="flamegraph_find_idhack.svg" size="2299569" author="will.buerger@mongodb.com" created="Mon, 30 Oct 2023 15:23:30 +0000"/>
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