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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-4309] automatically select an index to sort by for MR to increase performance</title>
                <link>https://jira.mongodb.org/browse/SERVER-4309</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In many cases of MR, people emit 1 key and usually have an index on it.&lt;br/&gt;
But few people actually think about sorting, even though it can greatly improve performance.&lt;br/&gt;
We can try to automate this for simple cases:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;run the map once on a single doc with a special emit method&lt;/li&gt;
	&lt;li&gt;if emitted value is simple, try to match corresponding field in the doc&lt;/li&gt;
	&lt;li&gt;if the field has an index, use that index, otherwise maybe log a line advising index&lt;/li&gt;
&lt;/ul&gt;
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        <key id="25063">SERVER-4309</key>
            <summary>automatically select an index to sort by for MR to increase performance</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>
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                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
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                <created>Thu, 17 Nov 2011 19:03:06 +0000</created>
                <updated>Tue, 6 Dec 2022 05:39:19 +0000</updated>
                                                                            <component>MapReduce</component>
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