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    <title>MongoDB Jira</title>
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    <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>[DRIVERS-1536] Investigate changes in PM-1942: Allow $changeStream to participate in optimization</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-1536</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    Specific downstream impact TBD.&lt;/p&gt;
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;$changeStream can participate in optimization resulting in more efficient resource utilization on a single node&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;Currently internal $changeStream stages cannot participate in optimization, inhibiting single-node execution performance when the user specifies additional $match / $project pipeline stages.&lt;br/&gt;
In a sharded cluster, user-defined $match and $project stages are not pushed down to shards; can result in excessive network consumption.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;Cast of Characters&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Product Owner: Katya Kamenieva&lt;/li&gt;
	&lt;li&gt;Project Lead: TBD&lt;/li&gt;
	&lt;li&gt;Program Manager: Craig Homa&lt;/li&gt;
	&lt;li&gt;Drivers Contact: TBD&lt;/li&gt;
&lt;/ul&gt;



&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;http://tinyurl.com/y958rxhu&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/y7dr4xev&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/y6wyyls7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="1599944">DRIVERS-1536</key>
            <summary>Investigate changes in PM-1942: Allow $changeStream to participate in optimization</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 25 Jan 2021 19:22:55 +0000</created>
                <updated>Fri, 27 May 2022 01:26:20 +0000</updated>
                            <resolved>Mon, 1 Feb 2021 17:45:49 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3592924" author="esha.bhargava" created="Mon, 1 Feb 2021 17:45:49 +0000"  >&lt;p&gt;No driver changes needed.&lt;/p&gt;</comment>
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