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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>
    </build-info>


<item>
            <title>[SERVER-31755] Raise intermediate $lookup document size to 100MB, and make it configurable</title>
                <link>https://jira.mongodb.org/browse/SERVER-31755</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #eeeeee;border-color: #cccccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #cccccc;background-color: #6cb33f;&quot;&gt;&lt;b&gt;Issue Status as of Jan 24, 2019&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #eeeeee;&quot;&gt;
&lt;p&gt;&lt;b&gt;FEATURE DESCRIPTION&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;The maximum size of a document during an intermediate $lookup stage will now be configurable with a setParameter called&#160;&lt;b&gt;internalLookupStageIntermediateDocumentMaxSizeBytes&lt;/b&gt;. The default value is 100 MB. This parameter has a minimum value of 16 MB, the maximum document size allowed for a document being returned to the user.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;RATIONALE&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;In general, documents are allowed to grow beyond the 16MB limit as they move through the pipeline--as long as the final documents which we serialize and send over the wire are within the limit.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;OPERATION&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;During runtime, this parameter can be set on each mongod using the following command:&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;db.adminCommand({setParameter: 1, internalLookupStageIntermediateDocumentMaxSizeBytes: &amp;lt;long&amp;gt;})&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;On startup, each mongod can set this parameter with the following flag:&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;--setParameter internalLookupStageIntermediateDocumentMaxSizeBytes=&amp;lt;long&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;To persist this setting in the configuration file, use the the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/configuration-options/#setparameter-option&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setParameter option&lt;/a&gt;:&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;   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;setParameter:&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;   internalLookupStageIntermediateDocumentMaxSizeBytes: &amp;lt;long&amp;gt;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&lt;b&gt;FIX VERSIONS&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;This feature will be included in MongoDB 3.6.11 and MongoDB 4.0.6.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h6&gt;&lt;a name=&quot;Originaldescription&quot;&gt;&lt;/a&gt;Original description&lt;/h6&gt;

&lt;p&gt;In 3.4.7 $lookup appears to have an intermediate 16MB document limit. An aggregation that has a $lookup as an intermediate stage returned this error &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.7/src/mongo/db/pipeline/document_source_lookup.cpp#L159-L163&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.4.7/src/mongo/db/pipeline/document_source_lookup.cpp#L159-L163&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;To address this a new setParameter,&lt;tt&gt;internalLookupStageIntermediateDocumentMaxSizeBytes&lt;/tt&gt;,&#160;has been added to control the size of an intermediate $lookup stage.&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="452186">SERVER-31755</key>
            <summary>Raise intermediate $lookup document size to 100MB, and make it configurable</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="13201">Fixed</resolution>
                                        <assignee username="brigitte.lamarche@mongodb.com">Brigitte Lamarche</assignee>
                                    <reporter username="brian.samek@mongodb.com">Brian Samek</reporter>
                        <labels>
                            <label>storch</label>
                    </labels>
                <created>Fri, 27 Oct 2017 21:16:55 +0000</created>
                <updated>Mon, 30 Oct 2023 23:12:29 +0000</updated>
                            <resolved>Fri, 14 Dec 2018 21:32:59 +0000</resolved>
                                                    <fixVersion>3.6.11</fixVersion>
                    <fixVersion>4.0.6</fixVersion>
                    <fixVersion>4.1.7</fixVersion>
                                                        <votes>1</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="2123558" author="xgen-internal-githook" created="Tue, 22 Jan 2019 22:41:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ian.boros@10gen.com&apos;, &apos;name&apos;: &apos;Ian Boros&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31755&quot; title=&quot;Raise intermediate $lookup document size to 100MB, and make it configurable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31755&quot;&gt;&lt;del&gt;SERVER-31755&lt;/del&gt;&lt;/a&gt; Create intermediate $lookup stage document size limit knob&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/128c43eb4ab29a1477e51d6ff9ef1517df4376f6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/128c43eb4ab29a1477e51d6ff9ef1517df4376f6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2123551" author="xgen-internal-githook" created="Tue, 22 Jan 2019 22:36:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ian.boros@10gen.com&apos;, &apos;name&apos;: &apos;Ian Boros&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31755&quot; title=&quot;Raise intermediate $lookup document size to 100MB, and make it configurable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31755&quot;&gt;&lt;del&gt;SERVER-31755&lt;/del&gt;&lt;/a&gt; Create intermediate $lookup stage document size limit knob&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1adb99ed363acc49f957d6106a0ee7824c3e94dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1adb99ed363acc49f957d6106a0ee7824c3e94dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2116891" author="sgaylord@facilitron.com" created="Wed, 16 Jan 2019 15:07:46 +0000"  >&lt;p&gt;Thank you Asya for that information.&#160; Any timeline on when 3.6.11 might be released?&#160; I think that is the next dot release you are referring to.&lt;/p&gt;</comment>
                            <comment id="2116519" author="asya" created="Wed, 16 Jan 2019 01:00:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sgaylord%40facilitron.com&quot; class=&quot;user-hover&quot; rel=&quot;sgaylord@facilitron.com&quot;&gt;sgaylord@facilitron.com&lt;/a&gt; this fix has been approved to be backported to 4.0 and 3.6 and the work is being done, unfortunately the backport won&apos;t be in the upcoming 3.6 dot release as it is already in code freeze.  It should be in the dot release after the next one.&lt;/p&gt;</comment>
                            <comment id="2114904" author="sgaylord@facilitron.com" created="Mon, 14 Jan 2019 22:03:43 +0000"  >&lt;p&gt;Is there a timeline to &quot;backport&quot; this fix to 3.6?&#160; We are on Atlas 3.6.9 and have been working to try to optimize our queries and continue to run into this where the $unwind and then $group basically just kills the work we are doing to optimize.&lt;/p&gt;</comment>
                            <comment id="2113025" author="xgen-internal-githook" created="Fri, 11 Jan 2019 22:03:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ian.boros@10gen.com&apos;, &apos;name&apos;: &apos;Ian Boros&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31755&quot; title=&quot;Raise intermediate $lookup document size to 100MB, and make it configurable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31755&quot;&gt;&lt;del&gt;SERVER-31755&lt;/del&gt;&lt;/a&gt; Create intermediate $lookup stage document size limit knob&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 277e40c1fc64c51c2407aa1371e8b925b6349c40.&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3efc0dc6639c164ad35c57d8ce077ed6461aa1b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3efc0dc6639c164ad35c57d8ce077ed6461aa1b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2113023" author="xgen-internal-githook" created="Fri, 11 Jan 2019 22:01:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ian.boros@10gen.com&apos;, &apos;name&apos;: &apos;Ian Boros&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31755&quot; title=&quot;Raise intermediate $lookup document size to 100MB, and make it configurable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31755&quot;&gt;&lt;del&gt;SERVER-31755&lt;/del&gt;&lt;/a&gt; Create intermediate $lookup stage document size limit knob&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/277e40c1fc64c51c2407aa1371e8b925b6349c40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/277e40c1fc64c51c2407aa1371e8b925b6349c40&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2095997" author="brigitte.lamarche" created="Wed, 19 Dec 2018 16:58:24 +0000"  >&lt;p&gt;The maximum size of a document during an intermediate $lookup stage will now be configurable with a setParameter called internalLookupStageIntermediateDocumentMaxSizeBytes. The default value is 100 MB. This parameter has a minimum value of 16 MB, the maximum document size allowed for a document being returned to the user.&lt;/p&gt;

&lt;p&gt;It can be set on the server thusly:&lt;/p&gt;

&lt;p&gt;&lt;font color=&quot;#6b778c&quot;&gt;--setParameter internalLookupStageIntermediateDocumentMaxSizeBytes=long&lt;/font&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2091443" author="xgen-internal-githook" created="Fri, 14 Dec 2018 20:42:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;bLamarche413&apos;, &apos;email&apos;: &apos;thesisiwbl@gmail.com&apos;, &apos;name&apos;: &apos;Brigitte Lamarche&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31755&quot; title=&quot;Raise intermediate $lookup document size to 100MB, and make it configurable&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31755&quot;&gt;&lt;del&gt;SERVER-31755&lt;/del&gt;&lt;/a&gt; Create intermediate $lookup stage document size limit knob&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dfc46be8d31620ed662898ee01bf473246ae49d3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dfc46be8d31620ed662898ee01bf473246ae49d3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2078481" author="asya" created="Mon, 3 Dec 2018 16:03:10 +0000"  >&lt;p&gt;&amp;gt;&#160;are you saying that you should always do the $unwind right after the $lookup even if you need the looked up documents in an array?&#160;&lt;/p&gt;

&lt;p&gt;I&apos;m definitely &lt;b&gt;not&lt;/b&gt; saying that, sorry if that wasn&apos;t clear.&#160; &#160;If you need the document with looked up data as array then it&apos;s probably smaller than 16MBs though.&lt;/p&gt;</comment>
                            <comment id="2078003" author="sgaylord@facilitron.com" created="Mon, 3 Dec 2018 04:57:09 +0000"  >&lt;p&gt;Thank you Asya.  Is there any documentation that I should know about for&lt;br/&gt;
these types of best practices?&lt;/p&gt;

&lt;p&gt;Also are you saying that you should always do the $unwind right after the&lt;br/&gt;
$lookup even if you need the looked up documents in an array?  So something&lt;br/&gt;
like $lookup then $unwind then $group?&lt;/p&gt;

&lt;p&gt;Also, are there any global things I can do so I don&apos;t have to rewrite them&lt;br/&gt;
all?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Steve&lt;/p&gt;




&lt;p&gt;Steve Gaylord&lt;br/&gt;
Chief Software Engineer&lt;br/&gt;
800-272-2962&lt;/p&gt;

</comment>
                            <comment id="2077689" author="asya" created="Sat, 1 Dec 2018 21:39:51 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=sgaylord%40facilitron.com&quot; class=&quot;user-hover&quot; rel=&quot;sgaylord@facilitron.com&quot;&gt;sgaylord@facilitron.com&lt;/a&gt;&#160;yes, the correct order would be to have $unwind immediate after $lookup - it will get incorporated into the $lookup stage and you won&apos;t hit the limit.&lt;/p&gt;

&lt;p&gt;In general it not a good idea to use $project to reduce the size of documents as normally the pipeline analyzes which fields it needs by itself and explicit $project stages can defeat this (and other) optimizations.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2077422" author="sgaylord@facilitron.com" created="Fri, 30 Nov 2018 22:11:20 +0000"  >&lt;p&gt;We are attempting to upgrade from 3.2 to 3.6.8 on Atlas and this issue is hitting us to the point where I don&apos;t know if we can make the move.&#160; We have many aggregates where we do a $lookup and then a $project to reduce the size of the documents and then do a $unwind, and many of these cause this error.&#160; So, we would have to change all these to move the $unwind to directly after the $lookup and then adjust the rest of the pipeline.&lt;/p&gt;

&lt;p&gt;Are there any more &quot;global&quot; type changes that can be done to help with this issue?&lt;/p&gt;</comment>
                            <comment id="1762953" author="david.storch" created="Tue, 2 Jan 2018 16:37:21 +0000"  >&lt;p&gt;I&apos;m not convinced that this is &quot;Works as Designed&quot;. In general, documents are allowed to grow beyond the 16MB limit as they move through the pipeline---as long as the final documents which we serialize and send over the wire are within the limit. I&apos;m re-opening this ticket for triage.&lt;/p&gt;</comment>
                            <comment id="1716507" author="brian.samek" created="Fri, 3 Nov 2017 15:05:14 +0000"  >&lt;blockquote&gt;&lt;p&gt;This happens when you don&apos;t have an $unwind immediately following $lookup, is that correct?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Correct.&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;Or is it a single $lookup on one source document that matches 16MBs?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The $lookup finds a large number of documents.&lt;/p&gt;</comment>
                            <comment id="1716455" author="asya" created="Fri, 3 Nov 2017 14:33:50 +0000"  >&lt;p&gt;This happens when you don&apos;t have an $unwind immediately following $lookup, is that correct?&lt;/p&gt;

&lt;p&gt;Or is it a single $lookup on one source document that matches 16MBs?&lt;/p&gt;</comment>
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