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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-1502] Generate indexes on a permanent map/reduce collection before it&apos;s swapped</title>
                <link>https://jira.mongodb.org/browse/SERVER-1502</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would be great if it was possible to define indexes on an output collection of a map/reduce before the permanent output collection was swapped.&lt;/p&gt;

&lt;p&gt;This would be very useful for scenario&apos;s where an application uses map/reduced data that&apos;s re-generated periodically to for example display pre-calculated data to users. There are use cases where you want to select data in a huge map/reduced output and need indexes to make this perform well. I could supply our use case if that&apos;s interesting to you.&lt;/p&gt;

&lt;p&gt;If the collection would be swapped by the periodical updater after an index is generated performance would not be degraded by indexing because the index would already be in place.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12578">SERVER-1502</key>
            <summary>Generate indexes on a permanent map/reduce collection before it&apos;s swapped</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="thijs">Thijs Cadier</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Jul 2010 10:49:52 +0000</created>
                <updated>Tue, 12 Jul 2016 00:18:02 +0000</updated>
                            <resolved>Tue, 9 Nov 2010 20:49:16 +0000</resolved>
                                                    <fixVersion>1.7.3</fixVersion>
                                                        <votes>5</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="20202" author="auto" created="Wed, 10 Nov 2010 06:58:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix slave indexes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1502&quot; title=&quot;Generate indexes on a permanent map/reduce collection before it&amp;#39;s swapped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1502&quot;&gt;&lt;del&gt;SERVER-1502&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
/mongodb/mongo/commit/ce9673398d713ecfd34e3afc23d2d3b0106b66f4&lt;/p&gt;</comment>
                            <comment id="20183" author="auto" created="Tue, 9 Nov 2010 20:49:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: copy indexes from permanent mr output collections before renaming so no hiccup &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1502&quot; title=&quot;Generate indexes on a permanent map/reduce collection before it&amp;#39;s swapped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1502&quot;&gt;&lt;del&gt;SERVER-1502&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
/mongodb/mongo/commit/5edab00f7c85d54cb0fde85dbd44545e659b20be&lt;/p&gt;</comment>
                            <comment id="19952" author="auto" created="Tue, 2 Nov 2010 04:10:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;erh&apos;, &apos;name&apos;: &apos;Eliot Horowitz&apos;, &apos;email&apos;: &apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: some thoughts on getting things from indexes &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1502&quot; title=&quot;Generate indexes on a permanent map/reduce collection before it&amp;#39;s swapped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1502&quot;&gt;&lt;del&gt;SERVER-1502&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-192&quot; title=&quot;query that just returns value in index should get data from index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-192&quot;&gt;&lt;del&gt;SERVER-192&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/5f0427fdd8a466f073c5ae15d6dbbea2701b19a7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/5f0427fdd8a466f073c5ae15d6dbbea2701b19a7&lt;/a&gt;&lt;/p&gt;</comment>
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