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    <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-22225] Allow seed to be specified during $sample.</title>
                <link>https://jira.mongodb.org/browse/SERVER-22225</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are several tickets currently open relating to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22068&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;statistical bias&lt;/a&gt; (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22068&quot; title=&quot;Add an option to $sample to perform a more statistically unbiased sample&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22068&quot;&gt;SERVER-22068&lt;/a&gt;) and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22069&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;incorrect seeding&lt;/a&gt; (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-22069&quot; title=&quot;Better seeding of WT&amp;#39;s random number generator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22069&quot;&gt;&lt;del&gt;SERVER-22069&lt;/del&gt;&lt;/a&gt;).  This request relates to the ability to explicitly pass in a PRNG seed as part of the &lt;tt&gt;$sample&lt;/tt&gt; pipeline.&lt;/p&gt;

&lt;p&gt;There are a number of situations that come immediately to mind where the ability to explicitly specify a seed would be beneficial.  The first, that I mentioned via IRC, is that of an e-commerce system showing &quot;random featured products&quot; which rotate daily.  Using the current Julian calendar date as the seed would naturally rotate daily and allow for both historical and future/predictive result generation.  This is similar to the pattern games such as Minecraft use to allow specifying a seed for algorithmic world generation.&lt;/p&gt;

&lt;p&gt;The syntax would become:&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;    { $sample: { size: &amp;lt;positive integer&amp;gt;, seed: &amp;lt;integer&amp;gt; } }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The seed, if omitted, could be PRNG generated itself.&lt;/p&gt;</description>
                <environment></environment>
        <key id="259368">SERVER-22225</key>
            <summary>Allow seed to be specified during $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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="alice@gothcandy.com">Dissatisfied Former User</reporter>
                        <labels>
                            <label>expression</label>
                    </labels>
                <created>Tue, 19 Jan 2016 16:50:25 +0000</created>
                <updated>Thu, 6 Apr 2023 15:38:23 +0000</updated>
                                            <version>3.2.1</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="3510414" author="justin@glassraven.com" created="Tue, 1 Dec 2020 15:37:35 +0000"  >&lt;p&gt;Was looking to use $sample for selecting a subset of data for machine learning but needed to specify seed as one of the requirements.&#160; As a result will have to implement sampling manually in the application.&#160; +1 for this enhancement request.&lt;/p&gt;</comment>
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