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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>
    </build-info>


<item>
            <title>[COMPASS-4504] MongoDB Compass cause Atlas Disk I/O % above 90%</title>
                <link>https://jira.mongodb.org/browse/COMPASS-4504</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>&lt;h3&gt;&lt;a name=&quot;ProblemDescription&quot;&gt;&lt;/a&gt;Problem Description&lt;/h3&gt;

&lt;p&gt;Whenever I have MongoDB Compass connect to our live database, after couple minutes I&apos;ll receive Atlas alert &quot;Disk I/O % utilization on Data Partition has gone above 90&quot;. And the alert keeps triggering while I keep Compass open.&#160;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;StepstoReproduce&quot;&gt;&lt;/a&gt;Steps to Reproduce&lt;/h3&gt;

&lt;p&gt;(My best guess, not minimal reproducible.)&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Create a MongoDB Atlas cluster, M40 with 3 shards.&lt;/li&gt;
	&lt;li&gt;Fill some data to a collection and make it around 25 million documents and 50GB.&#160;&lt;/li&gt;
	&lt;li&gt;Have MongoDB Compass connect to the cluster. Select that collection and show preview data.&#160;&lt;/li&gt;
&lt;/ol&gt;


&lt;h3&gt;&lt;a name=&quot;ExpectedResults&quot;&gt;&lt;/a&gt;Expected Results&lt;/h3&gt;

&lt;p&gt;There should not be alert triggered.&#160;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;ActualResults&quot;&gt;&lt;/a&gt;Actual Results&lt;/h3&gt;

&lt;p&gt;Atlas alert &quot;Disk I/O % utilization on Data Partition has gone above 90&quot;&lt;/p&gt;
&lt;h3&gt;&lt;a name=&quot;AdditionalNotes&quot;&gt;&lt;/a&gt;Additional Notes&lt;/h3&gt;</description>
                <environment>macOS 10.15.7, M40 with 3 shards</environment>
        <key id="1544872">COMPASS-4504</key>
            <summary>MongoDB Compass cause Atlas Disk I/O % above 90%</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="yang@thatgamecompany.com">Yang Liu</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 Nov 2020 08:08:53 +0000</created>
                <updated>Mon, 8 Aug 2022 22:03:08 +0000</updated>
                                            <version>1.23.0</version>
                                                    <component>Atlas</component>
                    <component>Performance</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3594179" author="yang@thatgamecompany.com" created="Tue, 2 Feb 2021 08:15:25 +0000"  >&lt;p&gt;Hi, thanks for looking into this and I&apos;m really sorry for the late reply.&#160;&lt;/p&gt;

&lt;p&gt;I run each command for about 5 minutes, and didn&apos;t get alerts or seeing any I/O peak in the Atlas &quot;Realtime&quot; monitor.&lt;/p&gt;

&lt;p&gt;When I use Compass to show the same collection, I does show the alerts. (But I cannot catch a obvious peak in the &quot;Realtime&quot; monitor either)&lt;/p&gt;

&lt;p&gt;The collection size being tested is as below&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/298144/298144_image-2021-02-02-00-15-11-284.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

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

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3495571" author="massimiliano.marcon" created="Wed, 18 Nov 2020 15:12:26 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=yang%40thatgamecompany.com&quot; class=&quot;user-hover&quot; rel=&quot;yang@thatgamecompany.com&quot;&gt;yang@thatgamecompany.com&lt;/a&gt; can you connect with the shell and run:&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;
		&lt;tbody &gt;
				&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;db.collection.countDocuments()&#8233;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;and&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;
		&lt;tbody &gt;
				&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;db.collection.aggregate( [&#8232; { $count: &quot;myCount&quot; }&#8232;])&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;(replacing &lt;tt&gt;collection&lt;/tt&gt; with the name of your sharded collection.&lt;/p&gt;

&lt;p&gt;and check if in both cases you see the same spike in I/O you saw with Compass?&lt;/p&gt;</comment>
                            <comment id="3495076" author="yang@thatgamecompany.com" created="Wed, 18 Nov 2020 08:11:39 +0000"  >&lt;p&gt;As a note, we had a consultant session with Karan from MongoDB who witnessed the issue we had.&#160;&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="298144" name="image-2021-02-02-00-15-11-284.png" size="39934" author="yang@thatgamecompany.com" created="Tue, 2 Feb 2021 08:15:12 +0000"/>
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