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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-30713] make mapReduce on mongos send UUID for final output collection of first pass of mapReduce to shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-30713</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is slightly lower priority than making mongos send the UUID for the final output collection of the &lt;b&gt;second&lt;/b&gt; pass, because the final output collection of the &lt;b&gt;first&lt;/b&gt; pass is a transient collection.&lt;/p&gt;

&lt;p&gt;When we start using UUIDs, in the second pass, we will probably want shards to query the final output collection of the first pass by UUID, which will only work if they all have the same UUID.&lt;/p&gt;

&lt;p&gt;It isn&apos;t a huge deal if this doesn&apos;t get into 3.6, though, because there are no backwards compatibility implications, as this is a UUID for a transient collection that is not meant to be visible to the user. It could be booted into the Collection Lifecycle (PM-85) project.&lt;/p&gt;</description>
                <environment></environment>
        <key id="417575">SERVER-30713</key>
            <summary>make mapReduce on mongos send UUID for final output collection of first pass of mapReduce to shards</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>LamontN</label>
                            <label>PM-1017</label>
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                <created>Thu, 17 Aug 2017 14:58:22 +0000</created>
                <updated>Tue, 12 Dec 2023 15:56:55 +0000</updated>
                                            <version>3.5.11</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
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