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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-40205] Allow $graphLookup to use projections to reduce memory consumption</title>
                <link>https://jira.mongodb.org/browse/SERVER-40205</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Performing a deep $graphLookup of a large graph can result in significant memory consumption due to the retrieval of unnecessary fields.&lt;/p&gt;

&lt;p&gt;For example, we have a collection of documents that have:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;id&lt;/li&gt;
	&lt;li&gt;parentId&lt;/li&gt;
	&lt;li&gt;content&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;If I want to retrieve all the IDs of a specific graph, the content property is irrelevant.&lt;/p&gt;

&lt;p&gt;If the content property is significantly large it can cause &quot;$graphLookup reached maximum memory consumption&quot; errors.&#160; By using a projection to ignore this field within a $graphLookup, memory consumption could be significantly reduced.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Instead, I think we&apos;ll have to create a simplified view of the collection and use that to perform the graph lookup, unless there are better suggestions?&lt;/p&gt;</description>
                <environment></environment>
        <key id="719064">SERVER-40205</key>
            <summary>Allow $graphLookup to use projections to reduce memory consumption</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-triage">Backlog - Triage Team</assignee>
                                    <reporter username="glenn.allen@milanote.com">Glenn Allen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 19 Mar 2019 04:35:06 +0000</created>
                <updated>Tue, 6 Dec 2022 03:03:14 +0000</updated>
                            <resolved>Tue, 19 Mar 2019 20:03:53 +0000</resolved>
                                    <version>3.6.11</version>
                                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2185448" author="glenn.allen@milanote.com" created="Tue, 19 Mar 2019 22:18:28 +0000"  >&lt;p&gt;Oh cool, thanks Danny, sorry I missed that one in my search.&lt;/p&gt;

&lt;p&gt;And sure, I&apos;ll head over to those groups, thanks!&lt;/p&gt;</comment>
                            <comment id="2185287" author="daniel.hatcher" created="Tue, 19 Mar 2019 20:03:40 +0000"  >&lt;p&gt;Hello Glenn,&lt;/p&gt;

&lt;p&gt;I believe that &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38560&quot; title=&quot;$graphLookup doesn&amp;#39;t support search within specific field(like SQL based grammar of &amp;#39;select&amp;#39;)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38560&quot;&gt;SERVER-38560&lt;/a&gt; should cover your use-case so I will close this ticket as a duplicate of that one.&lt;/p&gt;

&lt;p&gt;In regards to potential ways to work around the issue, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;/p&gt;

&lt;p&gt;Danny&lt;/p&gt;</comment>
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