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            <title>[SERVER-10451] 2dsphere default parameters are poor</title>
                <link>https://jira.mongodb.org/browse/SERVER-10451</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/index/s2_access_method.cpp#L45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/index/s2_access_method.cpp#L45&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;_params.maxCellsInCovering = 50;&lt;/p&gt;

&lt;p&gt;50 seems ludicrously high.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://code.google.com/p/s2-geometry-library/source/browse/geometry/s2regioncoverer.h#88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://code.google.com/p/s2-geometry-library/source/browse/geometry/s2regioncoverer.h#88&lt;/a&gt;&lt;/p&gt;
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        <key id="84970">SERVER-10451</key>
            <summary>2dsphere default parameters are poor</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="hari.khalsa@10gen.com">hari.khalsa@10gen.com</assignee>
                                    <reporter username="smremde">Stephen Remde</reporter>
                        <labels>
                            <label>indexing</label>
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                <created>Wed, 7 Aug 2013 09:17:27 +0000</created>
                <updated>Wed, 10 Dec 2014 23:04:41 +0000</updated>
                            <resolved>Thu, 1 May 2014 16:00:09 +0000</resolved>
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                                                                                                                <comments>
                            <comment id="554861" author="greg_10gen" created="Fri, 18 Apr 2014 18:01:46 +0000"  >&lt;p&gt;&amp;gt; 2dsphere default parameters are poor&lt;br/&gt;
Certainly this will depend on the application.&lt;/p&gt;

&lt;p&gt;&amp;gt; 50 seems ludicrously high.&lt;br/&gt;
I&apos;m not sure that&apos;s warranted - according to the table in the source, this will generate covered regions of about 1.25x the shape itself, and shape testing is expensive.  If your shapes are distributed widely the trade-off may be different.  Note that 50 is the maximum cell covering - it will only have any effect for complex shapes.&lt;/p&gt;

&lt;p&gt;We plan on better exposing this knob, however, see linked ticket.&lt;/p&gt;</comment>
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