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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>
    </build-info>


<item>
            <title>[SERVER-39628] Strange behaviour of spatial queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-39628</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have two MongoDB databases (named real and synthetic) where each one has one collection (named geoPoints).&lt;/p&gt;

&lt;p&gt;The two collections have the same number of documents with 4 fields (one of the fields are geoObjectJSON named location and its type is Point with longitude and latitude). They do not contain the same documents and they have 2d sphere indexes.&lt;/p&gt;

&lt;p&gt;The execution of a spatial query on the collection of the real database is performed in 9 seconds (returning approximately 2M documents). Executing a query (larger in terms of spatial extent) on the collection of the synthetic database returns fewer documents (about 400k) and is performed in 5144s. The difference of the queries&apos; execution time is huge. Is it reasonable for a spatial query which return fewer documents than a spatial query that returns more results, to require more time for its execution?&lt;/p&gt;

&lt;p&gt;The mentioned execution time of the queries are after running them 3 times.&lt;/p&gt;

&lt;p&gt;I attach the&#160;queryPlanner information for the two queries&lt;/p&gt;</description>
                <environment></environment>
        <key id="698932">SERVER-39628</key>
            <summary>Strange behaviour of spatial queries</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="5">Cannot Reproduce</resolution>
                                        <assignee username="eric.sedor@mongodb.com">Eric Sedor</assignee>
                                    <reporter username="nickkoutr">Nikolaos Koutroumanis</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Feb 2019 22:04:45 +0000</created>
                <updated>Mon, 24 Jun 2019 16:09:48 +0000</updated>
                            <resolved>Mon, 24 Jun 2019 16:09:48 +0000</resolved>
                                    <version>4.0.6</version>
                                                    <component>Index Maintenance</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2294982" author="eric.sedor" created="Mon, 24 Jun 2019 16:09:36 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;, our apologies. Unfortunately we have not been able to identify an issue with the information available. Please reach out if you are able to assist with a clear set of reproduction steps.&lt;/p&gt;</comment>
                            <comment id="2220142" author="nickkoutr" created="Sun, 21 Apr 2019 20:00:10 +0000"  >&lt;p&gt;I uploaded the synthetic dataset. I&apos;m still working on generating the trajectory data that resemble to the real data. I&apos;ll inform you when I finish with it. Feel free to ask anything about the uploaded data.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2217288" author="eric.sedor" created="Wed, 17 Apr 2019 23:20:45 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;; we appreciate it. Again, you can use this secure &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/4a80857c-aee9-417a-bbeb-e737b904c354.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upload portal&lt;/a&gt; when you are ready.&lt;/p&gt;</comment>
                            <comment id="2217018" author="nickkoutr" created="Wed, 17 Apr 2019 20:02:24 +0000"  >&lt;p&gt;Hello, I&apos;m sorry for the delayed responding. I am working these days on generating a dataset with trajectories on the road network (so as to resemble to the real dataset). Until weekend, i&apos;ll send you both the synthetic and the version of the real dataset.&lt;/p&gt;</comment>
                            <comment id="2215896" author="eric.sedor" created="Tue, 16 Apr 2019 22:17:00 +0000"  >&lt;p&gt;Hello, unfortunately we would still need to see at least the synthetic data set to keep investigating this. Is that possible?&lt;/p&gt;</comment>
                            <comment id="2179389" author="eric.sedor" created="Wed, 13 Mar 2019 13:39:38 +0000"  >&lt;p&gt;We understand &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;. If you are able to upload just the synthetic data, we may be able to investigate just with that.&lt;/p&gt;</comment>
                            <comment id="2178518" author="nickkoutr" created="Tue, 12 Mar 2019 16:31:52 +0000"  >&lt;p&gt;I&apos;m sorry but i can not provide the real dataset you requested because the data is private.&lt;/p&gt;</comment>
                            <comment id="2171862" author="eric.sedor" created="Tue, 5 Mar 2019 22:18:05 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;It&apos;s possible the &lt;tt&gt;real&lt;/tt&gt; database is staying in cache more than the &lt;tt&gt;synthetic&lt;/tt&gt; database, but multiple query executions should have ruled that out.&lt;/p&gt;

&lt;p&gt;To investigate further, we&apos;d like to compare these data sets ourselves.&lt;/p&gt;

&lt;p&gt;I&apos;ve created a secure &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/4a80857c-aee9-417a-bbeb-e737b904c354.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upload portal&lt;/a&gt; for you. Files uploaded to this portal are visible only to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;Can you please mongodump both &lt;tt&gt;real.geoPoints&lt;/tt&gt; and &lt;tt&gt;synthetic.geoPoints&lt;/tt&gt;, archive (tar or gzip) them, and upload them to this portal?&lt;/p&gt;

&lt;p&gt;If the data to upload exceeds 5GB it will be necessary to break it down. You can use the &lt;tt&gt;split&lt;/tt&gt; command as follows as a workaround:&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: #ff1493; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;split&lt;/span&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; -d -b 5300000000 filename.tgz part.&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;This bash script produces a series of &lt;tt&gt;part.XX&lt;/tt&gt; files, where &lt;tt&gt;XX&lt;/tt&gt; is a number, for upload; We&apos;ll stitch these back together on our side.&lt;/p&gt;</comment>
                            <comment id="2170268" author="eric.sedor" created="Mon, 4 Mar 2019 22:51:27 +0000"  >&lt;p&gt;Thanks Nikolaos,&lt;/p&gt;

&lt;p&gt;So far we do see that the query to the synthetic data set is yielding more often than the query to the real data set. This is shown by the following explain difference for synthetic:&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;&quot;saveState&quot; : 36562,&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;&quot;restoreState&quot; : 36562,&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;vs real:&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;&quot;saveState&quot; : 6259,&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;&quot;restoreState&quot; : 6259,&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;I am discussing this with the team.&lt;/p&gt;</comment>
                            <comment id="2167205" author="nickkoutr" created="Fri, 1 Mar 2019 11:53:17 +0000"  >&lt;p&gt;Thank you Eric, i attached it.&lt;/p&gt;</comment>
                            <comment id="2163748" author="eric.sedor" created="Tue, 26 Feb 2019 23:19:14 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt; sorry for the added step, but it looks like the attachments have been altered and the explain() against &lt;tt&gt;synthetic1&lt;/tt&gt; is no longer available to us. With apology, can you please add it back?&lt;/p&gt;</comment>
                            <comment id="2163719" author="eric.sedor" created="Tue, 26 Feb 2019 22:49:10 +0000"  >&lt;p&gt;Thanks for the additional information and your patience so far &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;. We are continuing to investigate.&lt;/p&gt;</comment>
                            <comment id="2157774" author="nickkoutr" created="Wed, 20 Feb 2019 22:29:42 +0000"  >&lt;p&gt;Yes of course,&#160; i attached it.&lt;/p&gt;</comment>
                            <comment id="2157748" author="eric.sedor" created="Wed, 20 Feb 2019 22:14:08 +0000"  >&lt;p&gt;Sorry for the added step &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;, I should have been clearer above: Can you also include the server log files to help us match up timestamps there?&lt;/p&gt;</comment>
                            <comment id="2157708" author="nickkoutr" created="Wed, 20 Feb 2019 21:50:06 +0000"  >&lt;p&gt;Thank you Eric Sedor,&lt;/p&gt;

&lt;p&gt;The data has changed a little bit (in terms of the number of documents), but the behaviour remains.&lt;/p&gt;

&lt;p&gt;The mongodb is installed locally in my computer, i&apos;m not using a cluster.&lt;/p&gt;

&lt;p&gt;The two databases which are on the same machine,&#160; contain now each one ~35Million Documents.&lt;/p&gt;

&lt;p&gt;I attach two (new) explain files (real - synthetic) - The query on the synthetic dataset returns less documents than the query of real dataset, requiring although more time for its execution.&lt;/p&gt;

&lt;p&gt;I also attach the directory you wanted. As you suggested,&#160;the last performed query is for the synthetic dataset (the slower one).&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2156509" author="eric.sedor" created="Wed, 20 Feb 2019 00:00:28 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nickkoutr&quot; class=&quot;user-hover&quot; rel=&quot;nickkoutr&quot;&gt;nickkoutr&lt;/a&gt;, this does seem odd especially given that the faster query on &quot;real&quot; scans 3229554 documents and index keys whereas the slower query on &quot;synthetic1&quot; scans only 580377.&lt;/p&gt;

&lt;p&gt;Can you let us know if these databases are on the same cluster?&lt;/p&gt;

&lt;p&gt;And can you please archive (tar or zip) the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory for the Primary node of the &quot;synthetic1&quot; database and attach it to this ticket? Please be sure to execute the slower of the queries before doing so to ensure metrics are collected for a recent execution.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Eric&lt;/p&gt;</comment>
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                            <attachment id="209613" name="diagnostic-data.zip" size="42708957" author="nickkoutr" created="Wed, 20 Feb 2019 21:46:50 +0000"/>
                            <attachment id="209612" name="explain-real.txt" size="10662" author="nickkoutr" created="Wed, 20 Feb 2019 21:46:07 +0000"/>
                            <attachment id="210227" name="explain-syntetic.txt" size="8520" author="nickkoutr" created="Fri, 1 Mar 2019 11:52:36 +0000"/>
                            <attachment id="209621" name="mongod.log" size="674597" author="nickkoutr" created="Wed, 20 Feb 2019 22:29:32 +0000"/>
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