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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-208] map reduce api</title>
                <link>https://jira.mongodb.org/browse/SERVER-208</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is very similar to group() except group only allows a single key to be extracted per object; map would allow emitting several. And use the map / reduce nomenclature.&lt;/p&gt;

&lt;p&gt;Needs to work with mongos too.&lt;/p&gt;

&lt;p&gt;db.coll.mapreduce(queryexpr, mapf, reducef);&lt;/p&gt;

&lt;p&gt;db.stuff.mapreduce(&lt;br/&gt;
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                <environment></environment>
        <key id="10394">SERVER-208</key>
            <summary>map reduce api</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Aug 2009 09:15:14 +0000</created>
                <updated>Tue, 12 Jul 2016 00:29:35 +0000</updated>
                            <resolved>Thu, 24 Sep 2009 10:56:51 +0000</resolved>
                                                    <fixVersion>1.1.1</fixVersion>
                                    <component>JavaScript</component>
                    <component>Usability</component>
                                        <votes>8</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="10791" author="eliot" created="Thu, 24 Sep 2009 10:56:51 +0000"  >&lt;p&gt;simple map/reduce api&lt;br/&gt;
take a look at jstests/mr1.js&lt;/p&gt;</comment>
                            <comment id="10372" author="eliot" created="Fri, 7 Aug 2009 13:50:22 +0000"  >&lt;p&gt;probably store in a temp collection.  then you could even query it, etc....&lt;/p&gt;</comment>
                            <comment id="10371" author="rgnitz" created="Fri, 7 Aug 2009 13:40:08 +0000"  >&lt;p&gt;How are large result datasets going to be handled? Will the results from the various nodes be stored in core or in a tmp document in the database? One of the issues (not sure if they fixed it yet) with GridGain is that the results from all the nodes is sent to a single node and placed in memory. I believe Hadoop handles this by storing all the node results in some sort of tmp file (and then provides a cursor).&lt;/p&gt;</comment>
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