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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-38974] How to force a mongodb mapreduce query to use a specific index (similar to &apos;$hint&apos;)?</title>
                <link>https://jira.mongodb.org/browse/SERVER-38974</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;we run thousands of mapreduce jobs in mongodb every day. Unfortunately mongodb sometimes uses the wrong index to perform these.&lt;/p&gt;

&lt;p&gt;Is there any way to pass a &apos;$hint&apos; flag to a mapreduce query ?&lt;/p&gt;

&lt;p&gt;Thanks&lt;br/&gt;
&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="671896">SERVER-38974</key>
            <summary>How to force a mongodb mapreduce query to use a specific index (similar to &apos;$hint&apos;)?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="rswem">RS</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Jan 2019 12:03:37 +0000</created>
                <updated>Tue, 6 Dec 2022 03:08:28 +0000</updated>
                            <resolved>Tue, 15 Jan 2019 18:36:23 +0000</resolved>
                                    <version>4.0.5</version>
                                                    <component>Index Maintenance</component>
                    <component>MapReduce</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2116009" author="daniel.hatcher" created="Tue, 15 Jan 2019 18:36:06 +0000"  >&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;The &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/mapReduce/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mapReduce command&lt;/a&gt; does not currently support hints. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10087&quot; title=&quot;provide index hinting within MapReduce&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10087&quot;&gt;&lt;del&gt;SERVER-10087&lt;/del&gt;&lt;/a&gt; tracks the feature request. However, the &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/aggregate/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aggregate command&lt;/a&gt; does support hints and can be a very powerful alternative to mapReduce. You may wish to investigate the possibility of using it in your application.&lt;/p&gt;

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

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