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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>[DOCS-15563] Add note on mapReduce changes to 4.4 compatibility page</title>
                <link>https://jira.mongodb.org/browse/DOCS-15563</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;in 4.4 there was a change in behaviour of MapReduce.&lt;br/&gt;
In 4.2: &lt;br/&gt;
&quot;MongoDB will not call the reduce function for a key that has only a single value. The values argument is an array whose elements are the value objects that are &quot;mapped&quot; to the key.&quot; &lt;a href=&quot;https://www.mongodb.com/docs/v6.0/reference/command/mapReduce/#requirements-for-the-reduce-function&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;docs&lt;/a&gt;&lt;br/&gt;
From 4.4 onwards, the reduce function will be called regardless of how many values are associated with a given key.&lt;/p&gt;

&lt;p&gt;Need to highlight is in the 4.4 upgrade &lt;a href=&quot;https://www.mongodb.com/docs/v5.3/release-notes/4.4-compatibility/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;docs&lt;/a&gt;, as it&apos;s braking for some customers &lt;/p&gt;</description>
                <environment></environment>
        <key id="2120172">DOCS-15563</key>
            <summary>Add note on mapReduce changes to 4.4 compatibility 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="jeffrey.allen@mongodb.com">Jeffrey Allen</assignee>
                                    <reporter username="kateryna.kamenieva@mongodb.com">Katya Kamenieva</reporter>
                        <labels>
                    </labels>
                <created>Tue, 23 Aug 2022 16:52:43 +0000</created>
                <updated>Mon, 30 Oct 2023 19:50:35 +0000</updated>
                            <resolved>Wed, 24 Aug 2022 20:16:34 +0000</resolved>
                                    <version>4.4.0</version>
                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4805782" author="xgen-internal-githook" created="Tue, 6 Sep 2022 18:55:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Allen&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;, &apos;username&apos;: &apos;jeff-allen-mongo&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15563&quot; title=&quot;Add note on mapReduce changes to 4.4 compatibility page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15563&quot;&gt;&lt;del&gt;DOCS-15563&lt;/del&gt;&lt;/a&gt;): Fix inaccurate mapReduce behavior (#1704)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;(&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15563&quot; title=&quot;Add note on mapReduce changes to 4.4 compatibility page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15563&quot;&gt;&lt;del&gt;DOCS-15563&lt;/del&gt;&lt;/a&gt;): Fix inaccurate mapReduce behavior&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix heading wording&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix broken ref&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix typo in ref&lt;br/&gt;
Branch: v6.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/ff16a0ad257605ac9d0938618159eaae4a1630b1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/ff16a0ad257605ac9d0938618159eaae4a1630b1&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4771913" author="xgen-internal-githook" created="Tue, 23 Aug 2022 21:38:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Allen&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;, &apos;username&apos;: &apos;jeff-allen-mongo&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15563&quot; title=&quot;Add note on mapReduce changes to 4.4 compatibility page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15563&quot;&gt;&lt;del&gt;DOCS-15563&lt;/del&gt;&lt;/a&gt;): Fix inaccurate mapReduce behavior (#1704)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;(&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15563&quot; title=&quot;Add note on mapReduce changes to 4.4 compatibility page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15563&quot;&gt;&lt;del&gt;DOCS-15563&lt;/del&gt;&lt;/a&gt;): Fix inaccurate mapReduce behavior&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix heading wording&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix broken ref&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix typo in ref&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/649d3d38be3287d155e85aa25434b2f2f1efa94c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/649d3d38be3287d155e85aa25434b2f2f1efa94c&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4771858" author="xgen-internal-githook" created="Tue, 23 Aug 2022 21:29:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jeff Allen&apos;, &apos;email&apos;: &apos;jeffrey.allen@10gen.com&apos;, &apos;username&apos;: &apos;jeff-allen-mongo&apos;}
&lt;p&gt;Message: (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15563&quot; title=&quot;Add note on mapReduce changes to 4.4 compatibility page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15563&quot;&gt;&lt;del&gt;DOCS-15563&lt;/del&gt;&lt;/a&gt;): Fix inaccurate mapReduce behavior (#1704)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;(&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15563&quot; title=&quot;Add note on mapReduce changes to 4.4 compatibility page&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15563&quot;&gt;&lt;del&gt;DOCS-15563&lt;/del&gt;&lt;/a&gt;): Fix inaccurate mapReduce behavior&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix heading wording&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix broken ref&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;fix typo in ref&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/ff16a0ad257605ac9d0938618159eaae4a1630b1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/ff16a0ad257605ac9d0938618159eaae4a1630b1&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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            <issuekey id="2111974">SERVER-68766</issuekey>
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