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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-74268] Run YCSB + Config ops</title>
                <link>https://jira.mongodb.org/browse/SERVER-74268</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Config ops like DDL operations and chunk migrations.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2272212">SERVER-74268</key>
            <summary>Run YCSB + Config ops</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 15:51:20 +0000</created>
                <updated>Wed, 7 Jun 2023 16:29:41 +0000</updated>
                            <resolved>Wed, 7 Jun 2023 16:29:41 +0000</resolved>
                                                                                        <votes>0</votes>
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                                                                                                                <comments>
                            <comment id="5481784" author="JIRAUSER1253401" created="Wed, 7 Jun 2023 16:24:44 +0000"  >&lt;p&gt;We used the same YCSB workload as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74267&quot; title=&quot;Run YCSB with catalog shard mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74267&quot;&gt;&lt;del&gt;SERVER-74267&lt;/del&gt;&lt;/a&gt; (56 million starting documents with 20 million operations with various read/write percentages).&lt;/p&gt;

&lt;p&gt;To perform the config ops, we modified the balancer code to initiate random chunk migrations every 10 seconds. Also the config server&#8217;s hardware was upgraded to match that of a dedicated shard server.&lt;/p&gt;

&lt;p&gt;The averaged results from three runs of the YCSB workload with config shard and config ops were compared to the averaged results from three runs of the YCSB workload without config shard but with config ops.&lt;/p&gt;

&lt;p&gt;The results can be found in this spreadsheet: &lt;a href=&quot;https://docs.google.com/spreadsheets/d/1tezs-_nY6l84arS0y_HGxF_gxtCs-h3yRDqUDP4lrsI/edit#gid=1773702825&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.google.com/spreadsheets/d/1tezs-_nY6l84arS0y_HGxF_gxtCs-h3yRDqUDP4lrsI/edit#gid=1773702825&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Overall there were no statistically significant performance regressions.&lt;/b&gt; The performance data was very noisy due to the randomness of the chunk migrations; however, all performance regressions were within 1 standard deviation of 0% performance regressions (if there was a standard deviation). This suggests that the performance regressions observed were likely due to random noise and not performance differences between YCSB with config shard and without config shard.&lt;/p&gt;</comment>
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