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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-49479] Create performance test for the effects of refreshes due to autosplitting</title>
                <link>https://jira.mongodb.org/browse/SERVER-49479</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41480&quot; title=&quot;Increment collection major version on chunk splits/merges&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41480&quot;&gt;&lt;del&gt;SERVER-41480&lt;/del&gt;&lt;/a&gt;, we made a modification to the chunk versioning algorithm that caused an improvement in some scenarios, but regressions in others. &lt;/p&gt;

&lt;p&gt;We should add a performance workload that&lt;br/&gt;
1) decreases the minimum chunk size to something very small;&lt;br/&gt;
2) performs many inserts, which will trigger autosplitting; and&lt;br/&gt;
3) measures latency and throughput.&lt;/p&gt;


&lt;p&gt;We should do this for several shard key value distributions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Insertions that cover the range of shard key values uniformly&lt;/li&gt;
	&lt;li&gt;Monotonically increasing shard keys&lt;/li&gt;
	&lt;li&gt;(Optional) Gaussian distribution over the range of shard key values&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This would give us confidence that future changes to our versioning algorithm won&apos;t cause regressions. As part of this, we should verify that the workload would confirm the difference in performance before and after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41480&quot; title=&quot;Increment collection major version on chunk splits/merges&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41480&quot;&gt;&lt;del&gt;SERVER-41480&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1408012">SERVER-49479</key>
            <summary>Create performance test for the effects of refreshes due to autosplitting</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding-emea">[DO NOT USE] Backlog - Sharding EMEA</assignee>
                                    <reporter username="matthew.saltz@mongodb.com">Matthew Saltz</reporter>
                        <labels>
                            <label>sharding-common-backlog</label>
                    </labels>
                <created>Mon, 13 Jul 2020 16:42:37 +0000</created>
                <updated>Fri, 27 Oct 2023 20:42:10 +0000</updated>
                            <resolved>Wed, 9 Nov 2022 11:27:11 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="4966365" author="JIRAUSER1256927" created="Wed, 9 Nov 2022 11:27:11 +0000"  >&lt;p&gt;Autosplitting was removed as part of PM-2323.&lt;/p&gt;</comment>
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