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    <title>MongoDB Jira</title>
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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-77983] Investigate performance regressions in lookup and graph_lookup workloads with a config shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-77983</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74266&quot; title=&quot;Run existing genny workloads in catalog shard mode as a one-off patch to evaluate any significiant performance deviations.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74266&quot;&gt;&lt;del&gt;SERVER-74266&lt;/del&gt;&lt;/a&gt;, we ran several genny workloads in config shard mode to evaluate any significant performance regressions. Through that we found several performance regressions in the lookup and graph_lookup workloads.&lt;/p&gt;

&lt;p&gt;After some initial investigation, it was not immediately clear whether the regressions were due to issues with the test setup (where the config shard&apos;s setup was not the exact same as a regular shard server&apos;s) or if there are actual issues with the config shard code. This ticket should investigate the root cause of the observed performance regressions in the lookup and graph_lookup workloads and determine if it&apos;s a test setup issue or an issue with the config shard code.&#160;&lt;/p&gt;

&lt;p&gt;For reference, here were the results from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74266&quot; title=&quot;Run existing genny workloads in catalog shard mode as a one-off patch to evaluate any significiant performance deviations.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74266&quot;&gt;&lt;del&gt;SERVER-74266&lt;/del&gt;&lt;/a&gt; in a spreadsheet:&lt;br/&gt;
&lt;a href=&quot;https://docs.google.com/spreadsheets/d/1l1LwDNAreDKoM6JjE0j2U3mzhgL0kUDOJXsMrZBj3tU/edit#gid=1114981944&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/spreadsheets/d/1l1LwDNAreDKoM6JjE0j2U3mzhgL0kUDOJXsMrZBj3tU/edit#gid=1114981944&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Here is an example of the setup used for the genny workloads with a config shard:&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/6481f437e3c331486c4f3c8d/changes?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://spruce.mongodb.com/version/6481f437e3c331486c4f3c8d/changes?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2365348">SERVER-77983</key>
            <summary>Investigate performance regressions in lookup and graph_lookup workloads with a config shard</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="wenqin.ye@mongodb.com">Wenqin Ye</reporter>
                        <labels>
                            <label>sharding-nyc-subteam2</label>
                    </labels>
                <created>Mon, 12 Jun 2023 14:36:25 +0000</created>
                <updated>Tue, 12 Dec 2023 15:51:56 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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            <issuekey id="2272208">SERVER-74266</issuekey>
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