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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-48458] Mongos open too many eventfd file handles</title>
                <link>https://jira.mongodb.org/browse/SERVER-48458</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;We have encountered an issue that mongos holding too many eventfd file handles while there are only few connections.&#160; This mongos had crashed because the system was using out of file handles. Following are the logs at that time:&lt;/p&gt;
&lt;p/&gt;
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&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;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;020-05-28T14:29:58.053+0800 F NETWORK [conn59705274] error in eventfd: Too many open files in system &lt;/span&gt;&lt;/pre&gt;
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					&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;2020-05-28T14:29:58.053+0800 I NETWORK [listener] Error accepting new connection on 0.0.0.0:3027: Too many open files in system &lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;And after it restarted, we noticed that it still holding 200k file handles, most of which are of type eventfd. While there were only 6 opening connections. I have uploaded the FTDC data, mongos.log and the file handle list. Please help!&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1365201">SERVER-48458</key>
            <summary>Mongos open too many eventfd file handles</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="mingyan.zc@gmail.com">Cen Zheng</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 May 2020 12:04:41 +0000</created>
                <updated>Tue, 12 Dec 2023 15:58:27 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>10</watches>
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                            <attachment id="263032" name="metrics.2020-05-28T06-30-14Z-00000" size="2465345" author="mingyan.zc@gmail.com" created="Thu, 28 May 2020 12:03:15 +0000"/>
                            <attachment id="263031" name="mongos.log.tar.gz" size="45063878" author="mingyan.zc@gmail.com" created="Thu, 28 May 2020 12:03:22 +0000"/>
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