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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>[COMPASS-4313] Aggregation pipeline applies sample mode with $out</title>
                <link>https://jira.mongodb.org/browse/COMPASS-4313</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>&lt;p&gt;Context&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;config.chunks collections with 811k documents&lt;/li&gt;
	&lt;li&gt;Compass Version 1.21.2&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Steps:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Add $group stage with code:&#160;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; _id: &quot;$shard&quot;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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; count: {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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; $sum: 1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;&lt;/li&gt;
	&lt;li&gt;&lt;b&gt;Turn off sample mode&lt;/b&gt;&lt;/li&gt;
	&lt;li&gt;Add a &lt;tt&gt;$out&lt;/tt&gt;&#160;stage to collection &lt;tt&gt;chunks_summary&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;See that output document in &lt;tt&gt;chunks_summary&lt;/tt&gt;&#160;includes { &quot;_id&quot; : &quot;shard_5&quot;, &quot;count&quot; : 5 }&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Expected:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The document in&#160;&lt;tt&gt;chunks_summary&lt;/tt&gt; should have had count 626.&lt;/li&gt;
	&lt;li&gt;I would &lt;b&gt;never expect the sampling to be applied to the $out&lt;/b&gt; even if &lt;em&gt;Sample mode&lt;/em&gt;&#160;was enabled&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Theory&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;It seems that turning off sample mode on an existing pipeline doesn&apos;t apply directly.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Workaround:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;If I start a &lt;b&gt;new&lt;/b&gt; pipeline, then turn off sample mode &lt;b&gt;before&lt;/b&gt;&#160;creating any stages it works.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1365600">COMPASS-4313</key>
            <summary>Aggregation pipeline applies sample mode with $out</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="-1">Unassigned</assignee>
                                    <reporter username="nicholas.cottrell@mongodb.com">Nic Cottrell</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 May 2020 16:33:09 +0000</created>
                <updated>Wed, 3 Jun 2020 16:06:08 +0000</updated>
                            <resolved>Wed, 3 Jun 2020 14:28:10 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                    <component>Aggregation pipeline</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3187218" author="massimiliano.marcon" created="Wed, 3 Jun 2020 14:28:10 +0000"  >&lt;p&gt;We are going to look (and address) the related issue (&lt;a href=&quot;https://jira.mongodb.org/browse/COMPASS-4312&quot; title=&quot;Aggregation pipeline applies sampling even after disabling sample mode&quot; class=&quot;issue-link&quot; data-issue-key=&quot;COMPASS-4312&quot;&gt;&lt;del&gt;COMPASS-4312&lt;/del&gt;&lt;/a&gt;) but we won&apos;t fix this one. I think it&apos;s confusing if you have sample mode enabled and the pipeline only behaves in the &quot;sample way&quot; only when it does not end with &lt;tt&gt;$out&lt;/tt&gt; (or &lt;tt&gt;$merge&lt;/tt&gt;).&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1365584">COMPASS-4312</issuekey>
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