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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-508] Update map reduce collections </title>
                <link>https://jira.mongodb.org/browse/SERVER-508</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be great if Mongo could update a Map Reduce Collection every x minutes. This was M/P functions that would be slightly inefficient to run on the fly, could be run in the background and the application itself would just need to read the map reduce result collection. This would work tremendously well for Map Reduce results that dont change in real time, but more so in pseudo-real time.&lt;/p&gt;

&lt;p&gt;e.g. authors -&amp;gt; name, books_per_year, avg_pages_per_book, foo_metric, bar_metric, ..&lt;br/&gt;
       book -&amp;gt; name, author , ..., subject, date_published&lt;br/&gt;
 Assuming 1 million authors and 10 million books&lt;/p&gt;

&lt;p&gt;M/R to get &quot;all authors whose foo_metric is between x &amp;amp; y and books_per_year is between x&apos; &amp;amp; y&apos; and date_publihsed is after 1-1-1990&quot; would be very inefficient currently, but could be &quot;refreshed&quot; every x mins. by mongo.&lt;/p&gt;</description>
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        <key id="11043">SERVER-508</key>
            <summary>Update map reduce collections </summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="ankit">Ankit Malhotra</reporter>
                        <labels>
                            <label>map-reduce</label>
                    </labels>
                <created>Wed, 23 Dec 2009 11:00:19 +0000</created>
                <updated>Tue, 6 Dec 2022 05:51:02 +0000</updated>
                            <resolved>Fri, 15 Apr 2022 15:59:00 +0000</resolved>
                                                                    <component>MapReduce</component>
                                        <votes>4</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4485663" author="asya" created="Fri, 15 Apr 2022 15:59:01 +0000"  >&lt;p&gt;Closing as part of deprecation of mapreduce&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="12900" author="colinmollenhour" created="Wed, 10 Mar 2010 15:22:32 +0000"  >&lt;p&gt;Or perhaps a map/reduce that exists as a sort of index, a.la. Couch.&lt;/p&gt;</comment>
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