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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-16126] find cursor don&apos;t return documents but count() does</title>
                <link>https://jira.mongodb.org/browse/SERVER-16126</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I ran following queries but it returns strange values. This makes inconsistency in the result.&lt;/p&gt;</description>
                <environment></environment>
        <key id="169067">SERVER-16126</key>
            <summary>find cursor don&apos;t return documents but count() does</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="mkim">Myoungki Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Nov 2014 16:47:59 +0000</created>
                <updated>Thu, 15 Jan 2015 20:57:55 +0000</updated>
                            <resolved>Thu, 15 Jan 2015 20:57:40 +0000</resolved>
                                    <version>2.6.5</version>
                                                    <component>Shell</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="805763" author="ramon.fernandez" created="Thu, 15 Jan 2015 20:57:27 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mkim&quot; class=&quot;user-hover&quot; rel=&quot;mkim&quot;&gt;mkim&lt;/a&gt;, since this is the expected behavior when using &lt;tt&gt;count()&lt;/tt&gt; against a &lt;tt&gt;mongos&lt;/tt&gt; I&apos;m going to close this ticket.&lt;/p&gt;

&lt;p&gt;For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;, where your question will reach a larger audience. A question like this involving more discussion would be best posted on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt;. &lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="764244" author="mkim" created="Fri, 14 Nov 2014 09:48:25 +0000"  >&lt;p&gt;The query ran on mongos.&lt;/p&gt;

&lt;p&gt;I have searched similar issues and found that it is because there are some shards which has &apos;nChunkSkips&apos; values.&lt;/p&gt;

&lt;p&gt;If this is the cause of this problem, how can I check the migration has been finished or not ? Is there any collection which has this information ?&lt;/p&gt;

&lt;p&gt;{&lt;br/&gt;
        &quot;cursor&quot; : &quot;BasicCursor&quot;,&lt;br/&gt;
        &quot;n&quot; : 402829886,&lt;br/&gt;
        &quot;nChunkSkips&quot; : 47440889,&lt;br/&gt;
        &quot;nYields&quot; : 5195594,&lt;br/&gt;
        &quot;nscanned&quot; : 450270775,&lt;br/&gt;
        &quot;nscannedAllPlans&quot; : 450270775,&lt;br/&gt;
        &quot;nscannedObjects&quot; : 450270775,&lt;br/&gt;
        &quot;nscannedObjectsAllPlans&quot; : 450270775,&lt;br/&gt;
        &quot;millisShardTotal&quot; : 3808270,&lt;br/&gt;
        &quot;millisShardAvg&quot; : 200435,&lt;br/&gt;
        &quot;numQueries&quot; : 19,&lt;br/&gt;
        &quot;numShards&quot; : 19,&lt;br/&gt;
        &quot;millis&quot; : 306738&lt;br/&gt;
}&lt;/p&gt;</comment>
                            <comment id="763651" author="ramon.fernandez" created="Thu, 13 Nov 2014 18:49:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mkim&quot; class=&quot;user-hover&quot; rel=&quot;mkim&quot;&gt;mkim&lt;/a&gt;, what are you running that query against? A mongos? A primary? A secondary? Also, how many documents are you expecting to match the query?&lt;/p&gt;

&lt;p&gt;Note that when run against a mongos, &lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/cursor.count/#sharded-clusters&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;count()&lt;/tt&gt; may return incorrect results&lt;/a&gt;. Can you send us the output of:&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.collection.find({ng:{$exists:false}}).explain()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;?&lt;/p&gt;
</comment>
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&lt;p&gt;db.collection.find({ng:{$exists:false}}).count()&lt;br/&gt;
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