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            <title>[SERVER-2166] Support 2 or more input collections for M/R</title>
                <link>https://jira.mongodb.org/browse/SERVER-2166</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Requirement as defined by customer:&lt;/p&gt;

&lt;p&gt;1. We have collection that contains all documents that are to be processed.&lt;br/&gt;
2.  At point of time, we will consider this collection as archive, and we will go ahead and create a new collection. But the documents pending processing in previous collection needs to be moved over to new collection. However in current releases, we don&apos;t have mechanism to move the documents in a sharded environment in backend itself. (One of the request that we have asked for).&lt;br/&gt;
3. So, under these conditions, it will be useful to do a map reduce on more than one collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="13835">SERVER-2166</key>
            <summary>Support 2 or more input collections for M/R</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="alvin">Alvin Richards</reporter>
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                <created>Wed, 1 Dec 2010 06:38:37 +0000</created>
                <updated>Wed, 1 Dec 2010 06:55:56 +0000</updated>
                            <resolved>Wed, 1 Dec 2010 06:46:01 +0000</resolved>
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                                                                                                                <comments>
                            <comment id="20877" author="eliot" created="Wed, 1 Dec 2010 06:55:56 +0000"  >
&lt;p&gt;You would use &lt;br/&gt;
merge if each collection had disjoint keys&lt;br/&gt;
reduce if you have the same keys in multiple collections.&lt;/p&gt;

&lt;p&gt;If the docs aren&apos;t clear, please either make a note or fix.&lt;/p&gt;</comment>
                            <comment id="20875" author="eliot" created="Wed, 1 Dec 2010 06:46:01 +0000"  >&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-647&quot; title=&quot;M/R: reduce into existing collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-647&quot;&gt;&lt;del&gt;SERVER-647&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-outType&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-outType&lt;/a&gt;&lt;/p&gt;</comment>
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