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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-40162] Change the default WiredTiger session_max from 20k to 33k</title>
                <link>https://jira.mongodb.org/browse/SERVER-40162</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The current default wired tiger session_max limit is 20k.  Unfortunately, this can often put session creation as the first terminal failure when adding many live connections.&lt;/p&gt;

&lt;p&gt;Since we currently use a thread per connection, and the vast majority of users don&apos;t alter pid_max, pushing the limit up to 33k is likely to make thread exhaustion the first limit users hit, instead of the wt session limit.  Thread exhaustion has slightly nicer semantics in that failure to create threads for ingress connection handling is non-terminal.&lt;/p&gt;</description>
                <environment></environment>
        <key id="717486">SERVER-40162</key>
            <summary>Change the default WiredTiger session_max from 20k to 33k</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="13201">Fixed</resolution>
                                        <assignee username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="mira.carey@mongodb.com">Mira Carey</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Fri, 15 Mar 2019 17:09:16 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:06 +0000</updated>
                            <resolved>Sat, 6 Apr 2019 01:50:19 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2204219" author="xgen-internal-githook" created="Sat, 6 Apr 2019 01:49:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40162&quot; title=&quot;Change the default WiredTiger session_max from 20k to 33k&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40162&quot;&gt;&lt;del&gt;SERVER-40162&lt;/del&gt;&lt;/a&gt; Change the default WiredTiger session_max from 20k to 33k&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/32b7f6e8004a05d6245c41302e706137e9f28b2f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/32b7f6e8004a05d6245c41302e706137e9f28b2f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2187915" author="jason.carey" created="Thu, 21 Mar 2019 20:14:22 +0000"  >&lt;p&gt;I think a reasonable deployment of mongod will set ulimits high enough that file descriptor exhaustion will not be a problem.&lt;/p&gt;

&lt;p&gt;In that configuration, the first thing that will fail (as you add concurrent running connections to a mongod), can be session creation, due to to the session_max limit.  The form of that error is an abrupt fassert.&lt;/p&gt;

&lt;p&gt;If we were to up the default as suggested by this ticket, we&apos;d be more likely to hit thread exhaustion (as almost no users in the wild set pid max past 32k).  Thread exhaustion in the server can be fatal, but usually is not (generally the thread we fail to allocate is the worker thread to handle a connection, and we error in that case by closing the incoming socket).  From what I&apos;ve gathered, I think that users prefer that failure mode.&lt;/p&gt;

&lt;p&gt;There&apos;s an explicit comparison between this ticket and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40161&quot; title=&quot;Make failure of conn-&amp;gt;open_session in WiredTigerSession ctor non-fatal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40161&quot;&gt;&lt;del&gt;SERVER-40161&lt;/del&gt;&lt;/a&gt;.  If we were to tackle that ticket, there would be no need to do this on.  If were to do this ticket, the urgency on that one would lower.&lt;/p&gt;</comment>
                            <comment id="2187884" author="april.schoffer" created="Thu, 21 Mar 2019 19:50:20 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mira.carey%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mira.carey@mongodb.com&quot;&gt;mira.carey@mongodb.com&lt;/a&gt; can you give us any more insight into the priority / how important this is?&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
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            <issuekey id="411189">SERVER-30462</issuekey>
        </issuelink>
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            <issuekey id="717482">SERVER-40161</issuekey>
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