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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-17354] Automatic incremental map-reduce</title>
                <link>https://jira.mongodb.org/browse/SERVER-17354</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;br/&gt;
I&apos;ve been testing out couchdb, and came across the concept of views.&lt;br/&gt;
Views in couchdb are keeping a pre-calculated map-reduce on all data in one database(collection), and they are updated automatically on every change on the original data set.&lt;br/&gt;
Knowing that mongodb supports mapreduce, i think it would be a good idea to be able to set up mapreduce that would output to another collection while keeping the mapreduced data synchronized based on inserts, updates, and deletions of the documents in the original collection.&lt;/p&gt;

&lt;p&gt;Often there are times where mapreduce is necessary to be used, and keeping the data set synchronized without the hassle or delay of the current incremental mapreduce method will make lives easier.&lt;/p&gt;

&lt;p&gt;For details about the implementation in couchdb, read the following articles:&lt;br/&gt;
&lt;a href=&quot;http://horicky.blogspot.com/2008/10/couchdb-implementation.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://horicky.blogspot.com/2008/10/couchdb-implementation.html&lt;/a&gt; (sections Views Indexes and Incremental View Update)&lt;br/&gt;
&lt;a href=&quot;http://damienkatz.net/2008/02/incremental_map.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://damienkatz.net/2008/02/incremental_map.html&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="185752">SERVER-17354</key>
            <summary>Automatic incremental map-reduce</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="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="FREEZX">Kristijan Trajkovski</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Feb 2015 19:35:57 +0000</created>
                <updated>Tue, 6 Dec 2022 04:55:36 +0000</updated>
                            <resolved>Fri, 4 Feb 2022 15:09:56 +0000</resolved>
                                                                    <component>MapReduce</component>
                                        <votes>1</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4335977" author="esha.bhargava" created="Fri, 4 Feb 2022 15:08:01 +0000"  >&lt;p&gt;Closing these tickets as part of the deprecation of mapReduce.&lt;/p&gt;</comment>
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