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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22046] Mongod crashes with Too Many Open Files while creating collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-22046</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&apos;re testing MongoDB 3.2 for a use case that have many collections in mongodb. We&apos;ve script that creates 100K collections in single database at a time.&lt;/p&gt;

&lt;p&gt;Case 1: We tried to create these collections with open files=64000(default set in mongod init script)&lt;/p&gt;

&lt;p&gt;Result 1: The mongod stopped with too many open files when created collections reached to ~30K.&lt;/p&gt;


&lt;p&gt;Case 2: Modified the mongod init script to set limit nofile 999999 999999.&lt;/p&gt;

&lt;p&gt;Result 2: Created 100K collections without any error. Also applied indexes to these collections. No issues found.&lt;/p&gt;


&lt;p&gt;Can we change the nofile value to 999999 permanently? How is it going to affect in production env? &lt;/p&gt;

&lt;p&gt;What would be the good practice to avoid/mitigate the open files issues with WiredTiger with this such use case?&lt;/p&gt;

&lt;p&gt;Any help would be appreciated.&lt;/p&gt;

&lt;p&gt;Thanks in advance!&lt;/p&gt;</description>
                <environment></environment>
        <key id="245416">SERVER-22046</key>
            <summary>Mongod crashes with Too Many Open Files while creating 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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="andhareatish@gmail.com">Ati And</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Jan 2016 02:48:22 +0000</created>
                <updated>Thu, 6 Apr 2023 15:16:26 +0000</updated>
                            <resolved>Mon, 4 Jan 2016 12:56:31 +0000</resolved>
                                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1125082" author="ramon.fernandez" created="Mon, 4 Jan 2016 12:56:12 +0000"  >&lt;p&gt;The WiredTiger storage engine needs to open one file per collection and one file per index, so please adjust your system limits accordingly. Note that the &lt;tt&gt;mongod&lt;/tt&gt; process will need to open other files as well (e.g.: log file).&lt;/p&gt;

&lt;p&gt;Please note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. 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;. See also our &lt;a href=&quot;https://www.mongodb.org/about/support/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Support page&lt;/a&gt; for additional support resources.&lt;/p&gt;

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