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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-18480] explain(&quot;executionStats&quot;) hangs / does not return anything</title>
                <link>https://jira.mongodb.org/browse/SERVER-18480</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongod 3.0.2, sharded collection with 2.72B documents.&lt;/p&gt;

&lt;p&gt;running a query with db.col.explain(&quot;executionStats&quot;).find(querydoc).sort(sortdoc) does not return any data even if wait hours.  db.col.find(querydoc).sort(sortdoc) would work after a few seconds.  Similarly, if you do a :&lt;/p&gt;

&lt;p&gt;db.col.find(querydoc).sort(sortdoc).explain() , you will get results after a few seconds, where db.col.find(querydoc).sort(sortdoc).explain(&quot;executionStats&quot;)  just hangs.  &lt;/p&gt;
</description>
                <environment></environment>
        <key id="204298">SERVER-18480</key>
            <summary>explain(&quot;executionStats&quot;) hangs / does not return anything</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="4">Incomplete</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="mjavadi">Mike Javadi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 May 2015 19:08:48 +0000</created>
                <updated>Thu, 18 Jun 2015 20:25:49 +0000</updated>
                            <resolved>Thu, 18 Jun 2015 20:25:49 +0000</resolved>
                                    <version>3.0.2</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="924867" author="ramon.fernandez" created="Wed, 27 May 2015 17:04:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mjavadi&quot; class=&quot;user-hover&quot; rel=&quot;mjavadi&quot;&gt;mjavadi&lt;/a&gt;, I tried to reproduce this behavior on my end, and what I observed is that gathering executionStats on such a large collection is bound to take a long time (specially if you&apos;re running a very slow query).&lt;/p&gt;

&lt;p&gt;If you&apos;re interested in stats I would suggest adding a batch size to see the stats for a subset of your documents; for example:&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;db.col.find(querydoc).sort(sortdoc).batchSize(1000000).explain(&quot;executionStats&quot;) &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;Can you try the above and see if it meets your needs?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="914713" author="ramon.fernandez" created="Thu, 14 May 2015 22:36:35 +0000"  >&lt;p&gt;It may not be uncommon for this operation to take a long time in such a large document. Can you please run db.col.find(querydoc).sort(sortdoc).explain(&quot;executionStats&quot;) and, while that&apos;s running, run &lt;tt&gt;db.currentOp(true)&lt;/tt&gt; from another shell and post the output? Having two samples of &lt;tt&gt;db.currentOp(true)&lt;/tt&gt; spaced out, for example, one minute apart may show whether the operation is stuck or making any progress.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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