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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-27880] Rate Limit Mongos Outbound Thread Creation</title>
                <link>https://jira.mongodb.org/browse/SERVER-27880</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, &lt;tt&gt;mongos&lt;/tt&gt; can create an unlimited number of outbound connections to &lt;tt&gt;mongod&lt;/tt&gt;&apos;s&lt;/p&gt;

&lt;p&gt;In cases with many (a few hundred) &lt;tt&gt;mongos&lt;/tt&gt; routers a temporary slowdown causes a massive, sudden increase in connections to the &lt;tt&gt;mongod&lt;/tt&gt;&apos;s.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25027&quot; title=&quot;Configurable connection pools size for mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25027&quot;&gt;&lt;del&gt;SERVER-25027&lt;/del&gt;&lt;/a&gt; allows limiting the number of outbound connections, but this is a manual setting requiring manual configuration and testing to determine an optimal value.&lt;/p&gt;

&lt;p&gt;What would be more beneficial is to implement a feedback loop between &lt;tt&gt;mongos&lt;/tt&gt; and &lt;tt&gt;mongod&lt;/tt&gt;, where new connections are rate limited slowing or preventing the negative performance implications from additional connections.&lt;/p&gt;

&lt;p&gt;This would hopefully prevent needing to manually set &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25027&quot; title=&quot;Configurable connection pools size for mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25027&quot;&gt;&lt;del&gt;SERVER-25027&lt;/del&gt;&lt;/a&gt; settings and reduce the overall number of connection spikes.&lt;/p&gt;</description>
                <environment></environment>
        <key id="350718">SERVER-27880</key>
            <summary>Rate Limit Mongos Outbound Thread Creation</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="3">Duplicate</resolution>
                                        <assignee username="backlog-server-platform">DO NOT USE - Backlog - Platform Team</assignee>
                                    <reporter username="kevin.arhelger@mongodb.com">Kevin Arhelger</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Jan 2017 23:30:31 +0000</created>
                <updated>Tue, 28 May 2019 18:44:27 +0000</updated>
                            <resolved>Tue, 28 May 2019 18:44:27 +0000</resolved>
                                    <version>3.2.12</version>
                    <version>3.4.2</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="2262384" author="jason.carey" created="Tue, 28 May 2019 18:44:27 +0000"  >&lt;p&gt;This was solved in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29237&quot; title=&quot;Add maxConnecting in asio connpool&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29237&quot;&gt;&lt;del&gt;SERVER-29237&lt;/del&gt;&lt;/a&gt; through the introduction of the maxConnecting parameter in the new sharding task executor connection pool.&lt;/p&gt;</comment>
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