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    <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-12566] Indicate unsupported mapReduce scenarios</title>
                <link>https://jira.mongodb.org/browse/DOCS-12566</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;p&gt;We have discovered a flaw in mapReduce, but we don&apos;t intend on dedicating resources to it at the moment. Performing the following actions can potentially cause a crash.&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;All concurrent mapReduces to sharded output collections with the &lt;b&gt;reduce&lt;/b&gt; option.&lt;/li&gt;
	&lt;li&gt;All concurrent mapReduces to sharded output collections with the &lt;b&gt;replace&lt;/b&gt; option &lt;em&gt;that output to an empty collection.&lt;/em&gt;&lt;/li&gt;
	&lt;li&gt;All concurrent mapReduces to sharded output collections with the &lt;b&gt;merge&lt;/b&gt; option &lt;em&gt;that output to an empty collection.&lt;/em&gt;&lt;/li&gt;
&lt;/ol&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;p&gt;We should indicate that those former mapReduces are unsupported.&lt;/p&gt;

&lt;p&gt;Include general advisory to use aggregation instead of mapreduce for operations against sharded collections.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="721075">DOCS-12566</key>
            <summary>Indicate unsupported mapReduce scenarios</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Mar 2019 13:27:30 +0000</created>
                <updated>Mon, 13 Nov 2023 18:23:56 +0000</updated>
                                                            <fixVersion>4.0.0</fixVersion>
                    <fixVersion>3.6.12</fixVersion>
                    <fixVersion>4.1.10</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4940486" author="edu.bot" created="Mon, 31 Oct 2022 16:06:08 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
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