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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-25437] db.runCommand(&quot;top&quot;) fails when there are too many collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-25437</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When there are too many namespaces in a MongoDB deployment, the &lt;tt&gt;top&lt;/tt&gt; command will return a document larger than the 16MB BSON limit. &lt;/p&gt;

&lt;p&gt;You can reproduce this easily by starting a mongod (I &lt;b&gt;highly&lt;/b&gt; recommend using &lt;tt&gt;mmapv1&lt;/tt&gt; as it has way less overhead per collection than wt does) and doing something like &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;  for(var j = 0; j &amp;lt; 200000; j++) {&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;   db.createCollection(&quot;collection__&quot;+j);&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;  }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Running &lt;tt&gt;mongotop&lt;/tt&gt; fails with the message:&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;mongotop --port 7777&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;2016-08-03T11:16:54.361-0500	Failed: BSONObj size: 40761145 (0x26DF739) is invalid. Size must be between 0 and 16793600(16MB) First element: note: &quot;all times in microseconds&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;The shell returns that same error when running the &lt;tt&gt;top&lt;/tt&gt; command manually.&lt;/p&gt;</description>
                <environment></environment>
        <key id="306301">SERVER-25437</key>
            <summary>db.runCommand(&quot;top&quot;) fails when there are too many collections</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kyle.erf">Kyle Erf</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Aug 2016 16:18:04 +0000</created>
                <updated>Thu, 4 Aug 2016 11:23:15 +0000</updated>
                            <resolved>Thu, 4 Aug 2016 11:23:15 +0000</resolved>
                                    <version>3.2.0</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1346930" author="ramon.fernandez" created="Thu, 4 Aug 2016 11:22:19 +0000"  >&lt;p&gt;Duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-6627&quot; title=&quot;top command should return cursor&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-6627&quot;&gt;SERVER-6627&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1346569" author="mpobrien" created="Thu, 4 Aug 2016 03:20:53 +0000"  >&lt;p&gt;Looks like purely an issue with the size of the output of the &quot;top&quot; command (that error message is from the server too, not the tools code). Going to move this over to SERVER.&lt;/p&gt;</comment>
                            <comment id="1346139" author="kyle.erf" created="Wed, 3 Aug 2016 16:20:12 +0000"  >&lt;p&gt;This won&apos;t be fixable without changes to the server. We&apos;ll likely have to update the command to return a cursor like &lt;tt&gt;listCollections&lt;/tt&gt; if we want this to be fully supported.&lt;/p&gt;</comment>
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