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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-66574] Large discrepancy of performance results of change_streams_throughput between Linux 3-Node ReplSet and Linux 3-Node ReplSet (all feature flags) variants</title>
                <link>https://jira.mongodb.org/browse/SERVER-66574</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a large discrepancy (&amp;gt;2x) of performance results of change_streams_throughput between &lt;b&gt;Linux 3-Node ReplSet&lt;/b&gt; and &lt;b&gt;Linux 3-Node ReplSet (all feature flags)&lt;/b&gt; variants.&lt;/p&gt;

&lt;p&gt;Performance result examples:&lt;br/&gt;
Results from &lt;b&gt;Linux 3-Node ReplSet&lt;/b&gt;:&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;379860_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/379860/379860_Linux+3-Node+ReplSet.png&quot; title=&quot;Linux 3-Node ReplSet.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;379860&quot; file-preview-title=&quot;Linux 3-Node ReplSet.png&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/379860/_thumb_379860.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Results from &lt;b&gt;Linux 3-Node ReplSet (all feature flags)&lt;/b&gt;:&lt;br/&gt;
&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;379859_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/379859/379859_Linux+3-Node+ReplSet+%28all+feature+flags%29.png&quot; title=&quot;Linux 3-Node ReplSet (all feature flags).png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;379859&quot; file-preview-title=&quot;Linux 3-Node ReplSet (all feature flags).png&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/379859/_thumb_379859.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;It shows that the performance results deteriorated no later than commit 2d9191c on May 18, 2021.&lt;/p&gt;

&lt;p&gt;Links to test results:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/sys_perf_linux_3_node_replSet_disabled_feature_flags_change_streams_throughput_2fdcda013f2cecafb496d58a362fec750b284e82_22_05_18_23_51_21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;change_streams_throughput on Linux 3-Node ReplSet (all feature flags)&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/sys_perf_linux_3_node_replSet_change_streams_throughput_2fdcda013f2cecafb496d58a362fec750b284e82_22_05_18_23_51_21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;change_streams_throughput on Linux 3-Node ReplSet&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2050318">SERVER-66574</key>
            <summary>Large discrepancy of performance results of change_streams_throughput between Linux 3-Node ReplSet and Linux 3-Node ReplSet (all feature flags) variants</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13202">Works as Designed</resolution>
                                        <assignee username="denis.grebennicov@mongodb.com">Denis Grebennicov</assignee>
                                    <reporter username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 May 2022 12:15:45 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:02 +0000</updated>
                            <resolved>Tue, 26 Jul 2022 17:47:52 +0000</resolved>
                                    <version>6.1.0-rc0</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4706297" author="JIRAUSER1259305" created="Tue, 26 Jul 2022 17:47:52 +0000"  >&lt;p&gt;This issue has already been investigated as part of this BF: &lt;a href=&quot;https://jira.mongodb.org/browse/BF-21288&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/BF-21288&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The issue arised from turning on writeConcern majority feature flag: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53439&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-53439&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Since writeConcern majority caused a lot of performance data to drop, the performance team decided to have the feature flag off in regular performance tests and turned on in all feature flags runs, as described here: &lt;a href=&quot;https://jira.mongodb.org/browse/PERF-2356&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/PERF-2356&lt;/a&gt;&#160;&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="379859" name="Linux 3-Node ReplSet (all feature flags).png" size="54444" author="mindaugas.malinauskas@mongodb.com" created="Thu, 19 May 2022 12:12:12 +0000"/>
                            <attachment id="379860" name="Linux 3-Node ReplSet.png" size="129818" author="mindaugas.malinauskas@mongodb.com" created="Thu, 19 May 2022 12:11:57 +0000"/>
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