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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-11516] $near query hangs server. </title>
                <link>https://jira.mongodb.org/browse/SERVER-11516</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are 1 million geo-data in my database and 20% of them are &lt;span class=&quot;error&quot;&gt;&amp;#91;-1.0,-1.0&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;I run the simple query db.test.find({lc:{$near:&lt;span class=&quot;error&quot;&gt;&amp;#91;-1.0,-1.0&amp;#93;&lt;/span&gt;}}).limit(1), which is extremely slow. It costs about 20~30 seconds and I think it is because the data will be sorted with $near operation first and then return 1 doc even if all of their locations are the same. &lt;/p&gt;

&lt;p&gt;The CPU usage would definitely rises up to 100%. Then the mongo hangs, all the other query has to wait the completion of the geo query.&lt;/p&gt;

&lt;p&gt;The problem is likely to: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8207&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-8207&lt;/a&gt;&lt;/p&gt;</description>
                <environment>EC-2 linux,    ubuntu 10.04</environment>
        <key id="96676">SERVER-11516</key>
            <summary>$near query hangs server. </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="3">Duplicate</resolution>
                                        <assignee username="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="Mark_H">Mark HUANG [X]</reporter>
                        <labels>
                            <label>query</label>
                    </labels>
                <created>Fri, 1 Nov 2013 03:58:57 +0000</created>
                <updated>Thu, 29 Jan 2015 20:09:24 +0000</updated>
                            <resolved>Thu, 29 Jan 2015 20:08:31 +0000</resolved>
                                    <version>2.4.7</version>
                                                    <component>Geo</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="816802" author="siyuan.zhou@10gen.com" created="Thu, 29 Jan 2015 19:34:53 +0000"  >&lt;p&gt;With &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=samantha.ritter%4010gen.com&quot; class=&quot;user-hover&quot; rel=&quot;samantha.ritter@10gen.com&quot;&gt;samantha.ritter@10gen.com&lt;/a&gt;&apos;s script, I am able to reproduce this issue on 2.6. It takes &lt;b&gt;18291ms&lt;/b&gt; to return 3 results on my workstation. On 3.0.0-rc7, it only takes &lt;b&gt;567ms&lt;/b&gt;. Given the fact that near stage has to fetch all 200k documents and sort them before returning to user, the current performance looks reasonable to me. So I would close this as a dup to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5800&quot; title=&quot;Refactor 2D $geoWithin into new query framework (expression index)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5800&quot;&gt;&lt;del&gt;SERVER-5800&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="555040" author="greg_10gen" created="Fri, 18 Apr 2014 20:15:07 +0000"  >&lt;p&gt;Some of this may be addressed by refactoring changes in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5800&quot; title=&quot;Refactor 2D $geoWithin into new query framework (expression index)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5800&quot;&gt;&lt;del&gt;SERVER-5800&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="452473" author="samantha.ritter@10gen.com" created="Wed, 6 Nov 2013 19:01:18 +0000"  >&lt;p&gt;Insert 200,000 legacy points, add 2d index, run query:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testnear.insert({ loc: [-1.0,-1.0] })&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testnear.ensureIndex({ loc: &quot;2d&quot; })&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&amp;gt; db.testnear.find({loc:{$near:[-1,-1]}}).limit(3)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Query &lt;ins&gt;does&lt;/ins&gt; hang server, and queries from another open mongos are blocked until first call returns.  Also, query with and without limit() argument seem to take the same amount of time.  From the server:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[conn2] query test.testnear query: { loc: { $near: [ -1.0, -1.0 ] } } ntoreturn:3 ntoskip:0 nscanned:3 keyUpdates:0 locks(micros) r:52174559 nreturned:3 reslen:182 52174ms&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Opening for triage!  Thanks, Mark, for reporting this!&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="38274">SERVER-5800</issuekey>
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2. start a mongo shell, db.test.find({loc:{$near:&lt;span class=&quot;error&quot;&gt;&amp;#91;-1,-1&amp;#93;&lt;/span&gt;}}).limit(3), mongo will hang for a long time till the query finished.&lt;br/&gt;
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