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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-57249] Performance degrade after 4.4.3 up-gradation from 4.2 version</title>
                <link>https://jira.mongodb.org/browse/SERVER-57249</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello Team,&lt;/p&gt;

&lt;p&gt;We have upgraded our whole cluster to 4.4 and found performance is not better instead degraded.&lt;/p&gt;

&lt;p&gt;We have sharded clusters with three replica in each set. We did performance testing by hitting some urls pre and post upgrades.&lt;/p&gt;

&lt;p&gt;Please share portal so we can upload logs personally.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1759394">SERVER-57249</key>
            <summary>Performance degrade after 4.4.3 up-gradation from 4.2 version</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="9">Done</resolution>
                                        <assignee username="edwin.zhou@mongodb.com">Edwin Zhou</assignee>
                                    <reporter username="aayushi.mangal3@gmail.com">Aayushi Mangal</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 May 2021 13:17:50 +0000</created>
                <updated>Wed, 1 Jun 2022 17:27:41 +0000</updated>
                            <resolved>Fri, 3 Sep 2021 15:47:16 +0000</resolved>
                                    <version>4.4.3</version>
                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4039246" author="JIRAUSER1257066" created="Fri, 3 Sep 2021 15:47:16 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to close this ticket. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="4005346" author="JIRAUSER1257066" created="Tue, 17 Aug 2021 21:06:04 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Have you been able to upgrade to MongoDB 4.4 from 4.2? If so, we&apos;re interested in:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;mongod and mongos logs, and the specific timestamps when workload is performed&lt;/li&gt;
	&lt;li&gt;the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; (contents described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We&apos;re looking forward to hearing back from you!&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="3971249" author="JIRAUSER1257066" created="Thu, 29 Jul 2021 17:48:55 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We&apos;re happy to hear that you&apos;re preparing to perform another upgrade! The metrics that we primarily need are ones that cover the workload on both 4.2 and 4.4. Can you please provide the following information for those two points?&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;mongod and mongos logs, and the specific timestamps when workload is performed&lt;/li&gt;
	&lt;li&gt;the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; (contents described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="3964498" author="JIRAUSER1269214" created="Tue, 27 Jul 2021 03:13:12 +0000"  >&lt;p&gt;Hi Edwin,&lt;/p&gt;

&lt;p&gt;I am able to do upgrade again. But need a week time. Meanwhile please provide me any inputs that you are looking from apart from logs. Like any standard tool we can use before and after upgrade of MongoDB to verify performance. Like keyhole or something?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Or any other steps we have to follow while upgrade our shard cluster?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We used only jmeter, and found our calls are slow after upgrade.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3963101" author="JIRAUSER1257066" created="Mon, 26 Jul 2021 15:57:07 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We still need additional information to diagnose the problem. If this is still an issue for you, would you please provide your kindly offered jmeter test results so we can understand the severity of this performance regression? If you&apos;re able to upgrade again to 4.4, can you provide the mongod logs, mongos logs, and the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; covering the workload in 4.2 where the degradation is absent, and for 4.4 where the degradation is present?&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="3928889" author="JIRAUSER1257066" created="Mon, 12 Jul 2021 18:28:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for following up. Unfortunately, without metrics from the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory covering workloads between 4.2 and 4.4, it will difficult to determine the root cause of the performance degradation. However, we&apos;d appreciate the jmeter test results which will give us an idea of the severity of the performance degradation. Can you also ensure that timestamps and timezone are visible in the jmeter testing? &lt;/p&gt;

&lt;p&gt;Nevertheless, we remain interested in understanding the cause of the performance degradation in 4.4 after upgrading from 4.2. We understand that transitioning between versions is a significant commitment and we will greatly appreciate if you&apos;re able to provide additional diagnostics. Can you provide the following information covering the workload in 4.2 where the degradation is absent, and for 4.4 where the degradation is present:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;mongod and mongos logs, and the specific timestamps when workload is performed&lt;/li&gt;
	&lt;li&gt;the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; (contents described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="3914121" author="JIRAUSER1269213" created="Fri, 2 Jul 2021 11:38:35 +0000"  >&lt;p&gt;Hi Edwin,&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;We dont have specific line showing degradation of performance. We did jmeter testing before and after upgrade. If you would like to I can share that too.&lt;/p&gt;</comment>
                            <comment id="3876345" author="JIRAUSER1257066" created="Mon, 14 Jun 2021 16:19:00 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for sharing the diagnostic data. Unfortunately it&apos;s unclear without a timeline or specific queries what the degradation is based on the data provided. Can you also provide:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;mongod and mongos logs&lt;/li&gt;
	&lt;li&gt;the mongos &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Can you then provide the specific log lines that suggest the performance degradation after upgrading to 4.4?&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
                            <comment id="3872522" author="JIRAUSER1269213" created="Fri, 11 Jun 2021 07:46:20 +0000"  >&lt;p&gt;Hi Edwin,&lt;/p&gt;

&lt;p&gt;Details shared.&lt;/p&gt;</comment>
                            <comment id="3860914" author="JIRAUSER1257066" created="Fri, 4 Jun 2021 20:32:13 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aayushi.mangal3%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;aayushi.mangal3@gmail.com&quot;&gt;aayushi.mangal3@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Would you please archive (tar or zip) the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory (the contents are described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) and upload it using the secure upload portal?&lt;/p&gt;

&lt;p&gt;I&apos;ve created a secure &lt;a href=&quot;https://mongodb.app.box.com/f/086b96bd4476406e8a309306549f9e83&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upload portal&lt;/a&gt; for you. Files uploaded to this portal are visible only to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;Best,&lt;br/&gt;
Edwin&lt;/p&gt;</comment>
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