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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>[DOCS-2225] Mention size limitation of reduce output document on map/reduce page</title>
                <link>https://jira.mongodb.org/browse/DOCS-2225</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/db.collection.mapReduce/#requirements-for-the-reduce-function&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/method/db.collection.mapReduce/#requirements-for-the-reduce-function&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;On the map/reduce page, some size limitations are mentioned (e.g. emit can only output 1/2 of BSON size), but it doesn&apos;t explicitly state that the reduce function is also bound by the 1/2 BSON size = 8MB limit.&lt;/p&gt;

&lt;p&gt;The error you get when trying to return a document larger than that limit is &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;
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				&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;	&quot;code&quot; : 13070,&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;This should be stated in the list of requirements for the reduce function.&lt;/p&gt;</description>
                <environment></environment>
        <key id="98398">DOCS-2225</key>
            <summary>Mention size limitation of reduce output document on map/reduce page</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="andrew.aldridge@mongodb.com">Andrew Aldridge</assignee>
                                    <reporter username="thomas.rueckstiess@mongodb.com">Thomas Rueckstiess</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Nov 2013 23:56:01 +0000</created>
                <updated>Mon, 16 Mar 2015 23:57:33 +0000</updated>
                            <resolved>Thu, 18 Sep 2014 20:13:03 +0000</resolved>
                                                    <fixVersion>v1.3.11</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="722385" author="xgen-internal-githook" created="Thu, 18 Sep 2014 20:11:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;i80and&apos;, u&apos;name&apos;: u&apos;Andrew Aldridge&apos;, u&apos;email&apos;: u&apos;i80and@foxquill.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2225&quot; title=&quot;Mention size limitation of reduce output document on map/reduce page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2225&quot;&gt;&lt;del&gt;DOCS-2225&lt;/del&gt;&lt;/a&gt;: Mention size limit of reduce&lt;/p&gt;

&lt;p&gt;Signed-off-by: Sam Kleinman &amp;lt;samk@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f45c646efef3e288ef18ea05a16903923beca50c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f45c646efef3e288ef18ea05a16903923beca50c&lt;/a&gt;&lt;/p&gt;</comment>
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