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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-76076] Investigate latency regressions in resharding workload while in catalog shard mode</title>
                <link>https://jira.mongodb.org/browse/SERVER-76076</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 a genny workload patch with catalog shard mode on for the `shard` and `shard-single` suites. The results of the patch can be found here: &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;

&lt;p&gt;Using the &lt;a href=&quot;https://performance-analyzer.server-tig.prod.corp.mongodb.com/perf-analyzer-viz/?evergreen_version=64346dd05623438f7351377a&amp;amp;evergreen_base_version=sys_perf_70c7c17bc5ef3cab7ca0e9836757209e5ed26d68&amp;amp;metrics_selection=Latency99thPercentile&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;performance analyzer tool&lt;/a&gt; to analyze the patch, we found that the reshard_collection_mixed workload had the largest regressions in terms of latencies. More specifically there were significant regressions in the 99th percentile latencies for reads and writes to a collection being resharded.&#160;&lt;/p&gt;

&lt;p&gt;The following is a mini-writeup with more details on the genny workload patch and the specific regressions noticed: &lt;a href=&quot;https://docs.google.com/document/d/1eAioYLvz_haug2RkRx-5e9Dlscw-nT8xQ70WNWmkSag/edit?usp=sharing&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?usp=sharing&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Someone with knowledge on resharding should investigate these regressions and see if there is anything that needs to be fixed or improved.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2314188">SERVER-76076</key>
            <summary>Investigate latency regressions in resharding workload while in catalog shard mode</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13203">Gone away</resolution>
                                        <assignee username="wenqin.ye@mongodb.com">Wenqin Ye</assignee>
                                    <reporter username="wenqin.ye@mongodb.com">Wenqin Ye</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Apr 2023 17:13:11 +0000</created>
                <updated>Fri, 27 Oct 2023 20:44:48 +0000</updated>
                            <resolved>Wed, 7 Jun 2023 17:49:51 +0000</resolved>
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