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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-51233] Warn on startup if vm.max_map_count &lt; 2 * max connections</title>
                <link>https://jira.mongodb.org/browse/SERVER-51233</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In our &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-checklist-operations/index.html#linux&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;production notes&lt;/a&gt; we recommend setting:&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;
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				&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;vm.max_map_count value of 128000&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 corresponds to our default max connections of 64k, as each connection requires 2 maps.&lt;/p&gt;

&lt;p&gt;Upon startup, the mongod should check this value (/proc/sys/vm/max_map_count) and warn if it doesn&apos;t equal 2*max connections.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Acceptance Criteria: We warn users that vm.max_map_count doesn&apos;t exceed 2x max connections&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1495798">SERVER-51233</key>
            <summary>Warn on startup if vm.max_map_count &lt; 2 * max connections</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="vojislav.stojkovic@mongodb.com">Vojislav Stojkovic</assignee>
                                    <reporter username="eric.sommer@mongodb.com">Eric Sommer</reporter>
                        <labels>
                            <label>sa-groomed</label>
                            <label>save-for-alex</label>
                            <label>save-for-vojislav</label>
                    </labels>
                <created>Wed, 30 Sep 2020 09:12:24 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:38 +0000</updated>
                            <resolved>Mon, 27 Sep 2021 19:46:17 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="4088157" author="billy.donahue" created="Tue, 28 Sep 2021 00:22:56 +0000"  >&lt;p&gt;code review took place here:&lt;br/&gt;
    &lt;a href=&quot;https://github.com/mongodb/mongo/pull/1421&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/pull/1421&lt;/a&gt;&lt;br/&gt;
Linked for posterity&lt;/p&gt;</comment>
                            <comment id="4087076" author="xgen-internal-githook" created="Mon, 27 Sep 2021 16:53:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vojislav Stojkovic&apos;, &apos;email&apos;: &apos;vojislav.stojkovic@mongodb.com&apos;, &apos;username&apos;: &apos;vstojkovic-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51233&quot; title=&quot;Warn on startup if vm.max_map_count &amp;lt; 2 * max connections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51233&quot;&gt;&lt;del&gt;SERVER-51233&lt;/del&gt;&lt;/a&gt; Warn on startup if vm.max_map_count is too low&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4ea51acda7d7659cb75dfdc6ed463bc5104c8238&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4ea51acda7d7659cb75dfdc6ed463bc5104c8238&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4083249" author="xgen-internal-githook" created="Fri, 24 Sep 2021 14:53:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Vojislav Stojkovic&apos;, &apos;email&apos;: &apos;vojislav.stojkovic@mongodb.com&apos;, &apos;username&apos;: &apos;vstojkovic-mongodb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51233&quot; title=&quot;Warn on startup if vm.max_map_count &amp;lt; 2 * max connections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51233&quot;&gt;&lt;del&gt;SERVER-51233&lt;/del&gt;&lt;/a&gt; Warn on startup if vm.max_map_count is too low&lt;br/&gt;
Branch: server-51233&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2bc0c12afc214d31d0c4bbbdf27df46c3e2050c3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2bc0c12afc214d31d0c4bbbdf27df46c3e2050c3&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1644598">SERVER-55068</issuekey>
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