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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4540] Allow specification of a shard key for sharded map/reduce output</title>
                <link>https://jira.mongodb.org/browse/SERVER-4540</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;According to &lt;a href=&quot;http://www.mongodb.org/display/DOCS/MapReduce#MapReduce-Shardedoutput&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the map/reduce &quot;sharded output&quot; documentation&lt;/a&gt;, the sharded collection created by a map/reduce with &lt;tt&gt;sharded&lt;/tt&gt; flag uses &lt;tt&gt;_id&lt;/tt&gt; as the shard key. It would be really helpful to be able to specify a shard key for the output collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="27083">SERVER-4540</key>
            <summary>Allow specification of a shard key for sharded map/reduce output</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>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="colinmarc">Colin Marc</reporter>
                        <labels>
                            <label>map_reduce</label>
                            <label>sharding</label>
                    </labels>
                <created>Wed, 21 Dec 2011 20:02:08 +0000</created>
                <updated>Tue, 6 Dec 2022 05:38:13 +0000</updated>
                            <resolved>Mon, 9 Mar 2020 20:41:04 +0000</resolved>
                                    <version>2.0.0</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2955548" author="charlie.swanson" created="Mon, 9 Mar 2020 20:41:04 +0000"  >&lt;p&gt;This is not an improvement we plan on making. However, the aggregation framework and &lt;a href=&quot;https://docs.mongodb.com/manual/reference/operator/aggregation/merge/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the $merge stage&lt;/a&gt; can merge to a collection with a different shard key. &lt;/p&gt;</comment>
                            <comment id="616145" author="salessandri" created="Tue, 10 Jun 2014 21:15:02 +0000"  >&lt;p&gt;+1&lt;/p&gt;

&lt;p&gt;This is a feature that would be extremely helpful. Not always - and I might say most of the time - the best sharding key is not the _ &lt;em&gt;id&lt;/em&gt; field.&lt;/p&gt;

&lt;p&gt;I haven&apos;t found a decent workaround for this issue.&lt;/p&gt;</comment>
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