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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-77642] Fix fresh_mongos case of mongos_large_catalog_workloads </title>
                <link>https://jira.mongodb.org/browse/SERVER-77642</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As the fresh_mongos case does not wait for stable performance, this test can be heavily thrown off whenever new startup tasks are added (see linked BF for an example of a change in a startup task causing a regression due to timing overlap with this test). Having a wider tolerance for such cases, reworking this case, or removing it could all be plausible solutions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2354860">SERVER-77642</key>
            <summary>Fix fresh_mongos case of mongos_large_catalog_workloads </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="2">Won&apos;t Fix</resolution>
                                        <assignee username="enrico.golfieri@mongodb.com">Enrico Golfieri</assignee>
                                    <reporter username="gabriel.marks@mongodb.com">Gabriel Marks</reporter>
                        <labels>
                    </labels>
                <created>Wed, 31 May 2023 15:47:42 +0000</created>
                <updated>Mon, 2 Oct 2023 07:54:10 +0000</updated>
                            <resolved>Mon, 2 Oct 2023 07:44:39 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5744547" author="JIRAUSER1265450" created="Mon, 2 Oct 2023 07:43:43 +0000"  >&lt;p&gt;Closing the ticket as after an offline discussion the related BF-28894 won&apos;t solve. More information in the BF&apos;s comments. To summarize:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74107&quot; title=&quot;Fix interaction between audit synchronize job and cluster parameter refresher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74107&quot;&gt;&lt;del&gt;SERVER-74107&lt;/del&gt;&lt;/a&gt; made the mongos_large_catalog test more stable and caused an improvement of 38% of speed&lt;/li&gt;
	&lt;li&gt;The only reason we experienced a drop in performance was due to the revert of that ticket on 7.0.&lt;/li&gt;
	&lt;li&gt;The loss/gain in performance is still negligible in terms of absolute values (2ms only)&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="5742201" author="JIRAUSER1262924" created="Fri, 29 Sep 2023 22:20:57 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sergi.mateo-bellido%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sergi.mateo-bellido@mongodb.com&quot;&gt;sergi.mateo-bellido@mongodb.com&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=enrico.golfieri%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;enrico.golfieri@mongodb.com&quot;&gt;enrico.golfieri@mongodb.com&lt;/a&gt;, do you think we can close this ticket, or assign to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=backlog-server-sharding-emea&quot; class=&quot;user-hover&quot; rel=&quot;backlog-server-sharding-emea&quot;&gt;backlog-server-sharding-emea&lt;/a&gt; for further investigation? If I understand correctly:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gabriel.marks%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;gabriel.marks@mongodb.com&quot;&gt;gabriel.marks@mongodb.com&lt;/a&gt; introduced a change that caused a perf improvement of 38%, and then reverted this change which caused a 60% performance &quot;regression&quot; in the same perf test due to the absence of the introduced change&lt;/li&gt;
	&lt;li&gt;We aren&apos;t conclusively sure at this point what caused the improvement, nor what caused the -22% net performance regression when it was reverted, but the code in question was not included in 7.0 in the first place&lt;/li&gt;
	&lt;li&gt;The perf test is stable and at (presumably) the previous baseline established before &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gabriel.marks%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;gabriel.marks@mongodb.com&quot;&gt;gabriel.marks@mongodb.com&lt;/a&gt;&apos;s change&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Given these points, if the continued discussion now is to see if we can extract some of that 38% increase that we gained with introducing the patch, it seems likely there will be some additional work required per &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=enrico.golfieri%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;enrico.golfieri@mongodb.com&quot;&gt;enrico.golfieri@mongodb.com&lt;/a&gt;&apos;s recent comment, and think it makes sense to have Sharding EMEA / Catalog and Routing take over any such investigation going forward - any further discussion is likely to just be speculative without additional engineer work IMO and I think our perspective aligns with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sergi.mateo-bellido%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;sergi.mateo-bellido@mongodb.com&quot;&gt;sergi.mateo-bellido@mongodb.com&lt;/a&gt;&apos;s comment as well:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;From our side going back to the previous values, as if SERVER-74107 was never added to 7.0 is not a problem.&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Happy to discuss further of course, thanks!&lt;/p&gt;</comment>
                            <comment id="5585820" author="JIRAUSER1256927" created="Mon, 24 Jul 2023 09:01:51 +0000"  >&lt;p&gt;&lt;ins&gt;&lt;b&gt;Summary&lt;/b&gt;&lt;/ins&gt;&lt;/p&gt;

&lt;p&gt;It looks like the refresh of the &lt;tt&gt;setClusterParameter&lt;/tt&gt; is not the reason of the drop. Overall, this benchmark was stable until the introduction of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74107&quot; title=&quot;Fix interaction between audit synchronize job and cluster parameter refresher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74107&quot;&gt;&lt;del&gt;SERVER-74107&lt;/del&gt;&lt;/a&gt; which added a performance improvement. For some reason, the same ticket was reverted in 7.0, introducing in this case a performance degradation which was just a go back to the previous performance results (i.e. without &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74107&quot; title=&quot;Fix interaction between audit synchronize job and cluster parameter refresher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74107&quot;&gt;&lt;del&gt;SERVER-74107&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;I was wondering whether &lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/32d6f0d75e0b2c5966825c6c71add1aa702aab90#diff-b2b28ade9f10b0eca807ab12e3656f843704054864a663649c38d1435c0ce4ebL138-L159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this specific early-exit on the &lt;tt&gt;synchronize&lt;/tt&gt; function would be the reason of the performance improvement&lt;/a&gt; and performance degradation when it is missing.&lt;/p&gt;

&lt;p&gt;From our side going back to the previous values, as if &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-74107&quot; title=&quot;Fix interaction between audit synchronize job and cluster parameter refresher&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-74107&quot;&gt;&lt;del&gt;SERVER-74107&lt;/del&gt;&lt;/a&gt; was never added to 7.0 is not a problem.&lt;/p&gt;

&lt;p&gt;Passing it to security and cc: &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gabriel.marks%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;gabriel.marks@mongodb.com&quot;&gt;gabriel.marks@mongodb.com&lt;/a&gt;&#160; to verify our hypothesis.&lt;/p&gt;</comment>
                            <comment id="5555747" author="JIRAUSER1253409" created="Mon, 10 Jul 2023 20:23:29 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=enrico.golfieri%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;enrico.golfieri@mongodb.com&quot;&gt;enrico.golfieri@mongodb.com&lt;/a&gt;, on our side, we are not going to reintroduce the failpoint for 7.0. I hesitate to close the ticket as won&apos;t fix, however, because the core issue, of the test producing inconsistent results that don&apos;t necessarily indicate a bug, is not fixed. I would say that if sharding is not planning to rework this test, it would be ideal if the test was flagged so that it doesn&apos;t produce BFs in the future. Reassigning to you to evaluate what you want to do with the test.&lt;/p&gt;</comment>
                            <comment id="5536940" author="JIRAUSER1253409" created="Fri, 30 Jun 2023 14:39:15 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=lamont.nelson%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;lamont.nelson@mongodb.com&quot;&gt;lamont.nelson@mongodb.com&lt;/a&gt; I think we already have &quot;stable_mongos&quot; tests. This case is supposed to be explicitly for a fresh mongos, which is why it produces inconsistent results.&lt;/p&gt;</comment>
                            <comment id="5536907" author="lamont.nelson" created="Fri, 30 Jun 2023 14:31:27 +0000"  >&lt;p&gt;Maybe a warmup/cooldown period would help?&lt;/p&gt;</comment>
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