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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-13088] Scalability of distinct is sub-optimal</title>
                <link>https://jira.mongodb.org/browse/SERVER-13088</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongo-perf shows distinct doesn&apos;t scale very well, and the problem gets evident  after 4 threads. This is tested on a recent 12-core Xeon. The problem affects every version of mongo I was able to test on (namely 2.2, 2.4, 2.6). Screenshot attached.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="118525">SERVER-13088</key>
            <summary>Scalability of distinct is sub-optimal</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="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Fri, 7 Mar 2014 01:45:14 +0000</created>
                <updated>Tue, 6 Dec 2022 05:09:47 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 20:03:36 +0000</resolved>
                                    <version>2.6.0-rc1</version>
                                                    <component>Concurrency</component>
                    <component>MMAPv1</component>
                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1717479" author="asya" created="Mon, 6 Nov 2017 13:05:50 +0000"  >&lt;p&gt;I&apos;ve run some quick tests and confirmed that this seems to only affect MMAPV1.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="39091" name="distinct.png" size="61491" author="davide.italiano" created="Fri, 7 Mar 2014 01:45:14 +0000"/>
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                            <customfieldvalue>&lt;p&gt;Get mongo-perf at &lt;a href=&quot;https://github.com/mongodb/mongo&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo&lt;/a&gt; , build, 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;
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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;./benchmark --test command --raw&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;and wait for the output of Distinct&lt;/p&gt;
{With,Without}
&lt;p&gt;Index.&lt;/p&gt;</customfieldvalue>

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