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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-74266] Run existing genny workloads in catalog shard mode as a one-off patch to evaluate any significiant performance deviations.</title>
                <link>https://jira.mongodb.org/browse/SERVER-74266</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="2272208">SERVER-74266</key>
            <summary>Run existing genny workloads in catalog shard mode as a one-off patch to evaluate any significiant performance deviations.</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="9">Done</resolution>
                                        <assignee username="wenqin.ye@mongodb.com">Wenqin Ye</assignee>
                                    <reporter username="kshitij.gupta@mongodb.com">Kshitij Gupta</reporter>
                        <labels>
                    </labels>
                <created>Wed, 22 Feb 2023 15:49:57 +0000</created>
                <updated>Mon, 12 Jun 2023 15:03:08 +0000</updated>
                            <resolved>Mon, 12 Jun 2023 14:44:33 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5492029" author="JIRAUSER1253401" created="Mon, 12 Jun 2023 14:43:33 +0000"  >&lt;p&gt;After some initial investigations we were not able to figure out whether or not the regressions in the $lookup and $graphLookup workloads are real. I have created &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77983&quot; title=&quot;Investigate performance regressions in lookup and graph_lookup workloads with a config shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77983&quot;&gt;SERVER-77983&lt;/a&gt; to investigate further and will close this ticket so we can close out PM-2290.&#160;&#160;&lt;/p&gt;</comment>
                            <comment id="5486077" author="jack.mulrow" created="Thu, 8 Jun 2023 19:22:12 +0000"  >&lt;p&gt;An update on this, Wenqin ran our genny tests after identifying setup differences in the config server and compiled the results of 3 runs &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;here&lt;/a&gt;. There&apos;s a lot of variance between runs, and the only statistically significant regressions seem to be in the $lookup and $graphLookup workloads where the foreign collection is sharded.&lt;/p&gt;

&lt;p&gt;We&apos;re looking more into if that is a real regression (it could be yet another setup difference or assumptions the workload makes), but the good news is everything else seems to show no regression.&lt;/p&gt;</comment>
                            <comment id="5456263" author="garaudy.etienne" created="Fri, 26 May 2023 20:12:04 +0000"  >&lt;p&gt;According to these test results, resharding ain&apos;t the only problem. Looks like regressions everywhere lol cc &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ratika.gandhi%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;ratika.gandhi@mongodb.com&quot;&gt;ratika.gandhi@mongodb.com&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5345277" author="JIRAUSER1253401" created="Thu, 13 Apr 2023 17:51:59 +0000"  >&lt;p&gt;Link to the workload patch: &lt;a href=&quot;https://spruce.mongodb.com/version/64346dd05623438f7351377a/tasks?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/64346dd05623438f7351377a/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5345270" author="JIRAUSER1253401" created="Thu, 13 Apr 2023 17:50:47 +0000"  >&lt;p&gt;Mini-writeup on the results from the genny workload: &lt;a href=&quot;https://docs.google.com/document/d/1eAioYLvz_haug2RkRx-5e9Dlscw-nT8xQ70WNWmkSag/edit#&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/document/d/1eAioYLvz_haug2RkRx-5e9Dlscw-nT8xQ70WNWmkSag/edit#&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Main issue we found was large regressions in the resharding workload for the 90th and 99th percentile latencies for reads/writes when compared to the baseline. I created a ticket for someone with more knowledge on resharding to investigate: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76076&quot; title=&quot;Investigate latency regressions in resharding workload while in catalog shard mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76076&quot;&gt;&lt;del&gt;SERVER-76076&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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