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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-19183] Allow storage engines to provide optimized random cursors for use by $sample</title>
                <link>https://jira.mongodb.org/browse/SERVER-19183</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The initial implementation of &lt;tt&gt;$sample&lt;/tt&gt; will involve a collection scan if it is the first stage in the pipeline. This could be dramatically improved if we exposed a way for storage engines to provide a random cursor that would do something more efficient like a random walk on a B-Tree to get pseudo-random results.&lt;/p&gt;

&lt;p&gt;This will only track the storage engine API and WiredTiger implementation of getRandomCursor(), work on integrating this into the aggregation pipeline will be tracked on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19182&quot; title=&quot;Integrate storage engine optimizations into $sample stage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19182&quot;&gt;&lt;del&gt;SERVER-19182&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="213706">SERVER-19183</key>
            <summary>Allow storage engines to provide optimized random cursors for use by $sample</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="geert.bosch@mongodb.com">Geert Bosch</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Mon, 29 Jun 2015 14:35:00 +0000</created>
                <updated>Sat, 19 Sep 2015 00:10:54 +0000</updated>
                            <resolved>Sat, 8 Aug 2015 03:34:46 +0000</resolved>
                                                    <fixVersion>3.1.7</fixVersion>
                                    <component>Aggregation Framework</component>
                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1017301" author="xgen-internal-githook" created="Fri, 28 Aug 2015 19:14:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19183&quot; title=&quot;Allow storage engines to provide optimized random cursors for use by $sample&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19183&quot;&gt;&lt;del&gt;SERVER-19183&lt;/del&gt;&lt;/a&gt;: Enable minimal randomness check now &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2032&quot; title=&quot;WT_CURSOR.next with random configuration and insert-list only trees&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2032&quot;&gt;&lt;del&gt;WT-2032&lt;/del&gt;&lt;/a&gt; is fixed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eb9054134519cc62676febf7f44ca103fe0208be&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eb9054134519cc62676febf7f44ca103fe0208be&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="999966" author="xgen-internal-githook" created="Sat, 8 Aug 2015 03:33:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;GeertBosch&apos;, u&apos;name&apos;: u&apos;Geert Bosch&apos;, u&apos;email&apos;: u&apos;geert@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19183&quot; title=&quot;Allow storage engines to provide optimized random cursors for use by $sample&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19183&quot;&gt;&lt;del&gt;SERVER-19183&lt;/del&gt;&lt;/a&gt;: Allow storage engines to provide optimized random cursors for use by $sample&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7eb8b1f43dfa70cad97168a182ffdc01eaa1aeb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7eb8b1f43dfa70cad97168a182ffdc01eaa1aeb&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="224355">WT-2032</issuekey>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="191291">SERVER-17688</issuekey>
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            <issuekey id="213705">SERVER-19182</issuekey>
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            <issuekey id="11109">SERVER-533</issuekey>
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