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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-66215] Investigate performance regression in DocumentSourceGroup when allowDiskUse is true</title>
                <link>https://jira.mongodb.org/browse/SERVER-66215</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In investigating BF-25112 a 20% regression was discovered after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63208&quot; title=&quot;Make allowDiskUse opt-out rather than opt-in&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63208&quot;&gt;&lt;del&gt;SERVER-63208&lt;/del&gt;&lt;/a&gt; landed on master. An initial investigation ruled out $lookup in sbe from being the cause due to presence of an inner pipeline syntax.&#160;&lt;/p&gt;

&lt;p&gt;The investigator should profile DocumentSourceGroup with the following query&#160;&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.foo.aggregate([{&quot;$group&quot;: {&quot;_id&quot; : {&quot;$sum&quot; : [&quot;$int&quot;, 1 ]}}])&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;With allowDiskUse defaulted to true and allowDiskUse=false.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2039609">SERVER-66215</key>
            <summary>Investigate performance regression in DocumentSourceGroup when allowDiskUse is true</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="13201">Fixed</resolution>
                                        <assignee username="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="eric.cox@mongodb.com">Eric Cox</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 May 2022 16:55:26 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:37 +0000</updated>
                            <resolved>Fri, 20 May 2022 11:30:51 +0000</resolved>
                                                    <fixVersion>6.0.0-rc7</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="4566668" author="xgen-internal-githook" created="Mon, 23 May 2022 16:06:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66215&quot; title=&quot;Investigate performance regression in DocumentSourceGroup when allowDiskUse is true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66215&quot;&gt;&lt;del&gt;SERVER-66215&lt;/del&gt;&lt;/a&gt; Create Sorter::File instances only when actually needed&lt;/p&gt;

&lt;p&gt;(cherry picked from commit dd2874d1fc652344154233fa1dbb5fd313a99463)&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aaa27a3f0fd75994584b7e5e4c08fcd86bb8af38&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aaa27a3f0fd75994584b7e5e4c08fcd86bb8af38&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4561817" author="xgen-internal-githook" created="Fri, 20 May 2022 11:27:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66215&quot; title=&quot;Investigate performance regression in DocumentSourceGroup when allowDiskUse is true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66215&quot;&gt;&lt;del&gt;SERVER-66215&lt;/del&gt;&lt;/a&gt; Create Sorter::File instances only when actually needed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd2874d1fc652344154233fa1dbb5fd313a99463&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd2874d1fc652344154233fa1dbb5fd313a99463&lt;/a&gt;&lt;/p&gt;</comment>
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