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<item>
            <title>[DRIVERS-761] Deprecate MapReduce command</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-761</link>
                <project id="10980" key="DRIVERS">Drivers</project>
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;
&lt;p&gt;Deprecate the MR command and ensure its functionality is fully supported by Agg. The backend of the command has already been replaced by &#8220;MapReduce in Agg&#8221; (PM-776), we need to make sure all necessary concepts can be expressed in MQL.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;
&lt;p&gt;One objective of the query team is to consolidate dialects of all existing query commands into a single language. This project enables users to write their MR tasks directly in Agg, which provides a more capable and clear syntax. We want to move users away from legacy ways of interacting with the system. Independently, from MR jobs, some extensions are valuable for the users.&lt;/p&gt;

&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WRITING-3918&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
Technical Design Document&lt;/p&gt;
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        <key id="974272">DRIVERS-761</key>
            <summary>Deprecate MapReduce command</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Mon, 21 Oct 2019 14:42:12 +0000</created>
                <updated>Fri, 16 Jul 2021 01:13:27 +0000</updated>
                            <resolved>Thu, 9 Jul 2020 17:08:56 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2495615" author="behackett" created="Tue, 22 Oct 2019 17:27:52 +0000"  >&lt;p&gt;The description is correct. The mapReduce command will be deprecated as soon as all the features exist in aggregate (in the public API) to replace it.&lt;/p&gt;

&lt;p&gt;How this relates to &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-646&quot; title=&quot;MapReduce in Aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-646&quot;&gt;&lt;del&gt;DRIVERS-646&lt;/del&gt;&lt;/a&gt; depends on the timeframe. If the deprecation happens in 4.4 we can deprecate our helpers for 4.4.&lt;/p&gt;</comment>
                            <comment id="2492875" author="esha.bhargava" created="Mon, 21 Oct 2019 16:21:53 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=behackett&quot; class=&quot;user-hover&quot; rel=&quot;behackett&quot;&gt;behackett&lt;/a&gt; to find out how this relates to &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-646&quot; title=&quot;MapReduce in Aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-646&quot;&gt;&lt;del&gt;DRIVERS-646&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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