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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-32049] significant performance degradation on mongo server with ~140K collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-32049</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;br/&gt;
    We have a mongo server with ~140K collections. After restart or new node sync all file descriptors of all collections stay open, which is normal, what is abnormal is that the app suffered from a severe performance degradation until those FDs where closed. Is there any limitation regarding number of collections.&lt;/p&gt;

&lt;p&gt;Another question:   By default mongo closes FDs after 28hrs by default, except for the startup options `file_manager=(close_idle_time=300)` is there any &quot;dynamic&quot; parameter . we can use ?&lt;/p&gt;

&lt;p&gt;Or maximum number of open files is 265000&lt;/p&gt;

&lt;p&gt;Br&lt;/p&gt;</description>
                <environment></environment>
        <key id="462223">SERVER-32049</key>
            <summary>significant performance degradation on mongo server with ~140K collections</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="4">Incomplete</resolution>
                                        <assignee username="backlog-server-triage">Backlog - Triage Team</assignee>
                                    <reporter username="tapuhi">Avraham Apelbaum</reporter>
                        <labels>
                            <label>collections</label>
                            <label>wiredtiger</label>
                    </labels>
                <created>Tue, 21 Nov 2017 11:07:57 +0000</created>
                <updated>Tue, 6 Dec 2022 03:46:09 +0000</updated>
                            <resolved>Mon, 12 Feb 2018 17:17:02 +0000</resolved>
                                    <version>3.2.12</version>
                                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1803043" author="ramon.fernandez" created="Mon, 12 Feb 2018 17:17:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=tapuhi&quot; class=&quot;user-hover&quot; rel=&quot;tapuhi&quot;&gt;tapuhi&lt;/a&gt;, we haven&apos;t heard back from you for a long time, so I&apos;m going to close this ticket. If this is still an issue for you please feel free to comment here.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1731661" author="bruce.lucas@10gen.com" created="Tue, 21 Nov 2017 15:52:43 +0000"  >&lt;p&gt;Hi Avraham, &lt;/p&gt;

&lt;p&gt;We have made improvements in 3.4 in workloads with a large number of tables (see &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3329&quot; title=&quot;With a uniform workload and a number of small collections, eviction does a poor job of selecting candidates for eviction.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3329&quot;&gt;&lt;del&gt;WT-3329&lt;/del&gt;&lt;/a&gt;). Would you be able to test your workload on 3.4.9 or later?&lt;/p&gt;

&lt;p&gt;You can change the WiredTiger engine configuration dynamically using setParameter, e.g.&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;db.runCommand({setParameter: 1, wiredTigerEngineRuntimeConfig: &quot;close_idle_time=300&quot;})&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Bruce&lt;/p&gt;</comment>
                            <comment id="1731395" author="tapuhi" created="Tue, 21 Nov 2017 11:08:26 +0000"  >&lt;p&gt;I forgot to mention we use WireTiger as storage engine.&lt;/p&gt;</comment>
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