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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-19039] geoNear scans the same index cells multiple times, slowing down queries with many search intervals</title>
                <link>https://jira.mongodb.org/browse/SERVER-19039</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;geoNear generates search intervals intended to contain between 300 and 600 documents. The minimum distance of each search interval is the same as the maximum distance of the previous one. &lt;br/&gt;
In the current implementation, it will create an approximate covering of the search interval using index cells. This covering may contain index cells that were already scanned in the previous search interval, resulting in the same index cells and documents being checked more than once. For dense data, these search intervals will be very thin, resulting in an inaccurate covering that will likely contain many cells that were already in coverings of previous search intervals.&lt;/p&gt;

&lt;p&gt;Possible solution:&lt;br/&gt;
Maintain a union of all of the cells that have been contained in previous coverings. When generating the covering for a new search interval, only cover the region that does not intersect with the union. &lt;br/&gt;
This solution will improve performance for queries that require many search intervals, but will slightly slow performance for queries that only require one search interval because it will fetch all the documents in the covering regardless of whether they are in the search interval.&lt;/p&gt;</description>
                <environment></environment>
        <key id="211666">SERVER-19039</key>
            <summary>geoNear scans the same index cells multiple times, slowing down queries with many search intervals</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="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="brandon.zhang">Brandon Zhang</assignee>
                                    <reporter username="brandon.zhang">Brandon Zhang</reporter>
                        <labels>
                    </labels>
                <created>Thu, 18 Jun 2015 20:02:31 +0000</created>
                <updated>Fri, 5 Feb 2016 14:29:59 +0000</updated>
                            <resolved>Mon, 20 Jul 2015 15:43:46 +0000</resolved>
                                                    <fixVersion>3.1.6</fixVersion>
                                    <component>Geo</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="969975" author="xgen-internal-githook" created="Mon, 20 Jul 2015 15:29:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;name&apos;: u&apos;Brandon Zhang&apos;, u&apos;email&apos;: u&apos;brandon.zhang@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19039&quot; title=&quot;geoNear scans the same index cells multiple times, slowing down queries with many search intervals&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19039&quot;&gt;&lt;del&gt;SERVER-19039&lt;/del&gt;&lt;/a&gt; Buffer fetched documents in geoNear&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1de0a646d1c373e8a694d2a26c3f5ebb10137f14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1de0a646d1c373e8a694d2a26c3f5ebb10137f14&lt;/a&gt;&lt;/p&gt;</comment>
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