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<item>
            <title>[SERVER-6028] Too many open connections kills primary but doesn&apos;t trigger failover</title>
                <link>https://jira.mongodb.org/browse/SERVER-6028</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Late last night we had some issues with mongos (unfortunately not clear what went wrong - bouncing fixed it). About an hour later we then had a massive spike in the number of connections from mongos to the primary. This then caused &apos;too many open connections&apos; to start flooding the primaries logs and connection attempts throughout our application to consistently fail. In effect, our primary was dead.&lt;/p&gt;

&lt;p&gt;However, our primary was still telling all the secondaries that it was alive and well so no failover happened.&lt;/p&gt;

&lt;p&gt;I think the health checks need to do more than they do. The primary can&apos;t just be &quot;alive&quot; it must be &quot;alive and well&quot; - i.e. responding to queries and new connections.&lt;/p&gt;</description>
                <environment></environment>
        <key id="40653">SERVER-6028</key>
            <summary>Too many open connections kills primary but doesn&apos;t trigger failover</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="ben.caimano@mongodb.com">Benjamin Caimano</assignee>
                                    <reporter username="colinhowe">Colin Howe</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Jun 2012 07:44:03 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:18 +0000</updated>
                            <resolved>Mon, 10 Dec 2018 20:43:16 +0000</resolved>
                                    <version>2.0.5</version>
                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2086237" author="jason.carey" created="Mon, 10 Dec 2018 20:43:16 +0000"  >&lt;p&gt;Closing this out, due to age, in favor of either &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; (max connecting) or PM-1123 (the request backpressure epic)&lt;/p&gt;</comment>
                            <comment id="2086234" author="jason.carey" created="Mon, 10 Dec 2018 20:41:36 +0000"  >&lt;p&gt;My thinking here is that, assuming we hit maxConns during a connection storm, there is no reasonable, pure server side solution.&lt;/p&gt;

&lt;p&gt;Taking the scenario mentioned in the ticket, where mongos bursts down a primary, it&apos;s fairly obvious that fail over will only replicate the problem on the new primary.&#160; For that use case, our best option is either the MaxConnecting sharding task executor parameter (which exists today, and will work if the problem is our inability to re-use connections during a short period), or cooperation between mongos/drivers and mongod in the form of an explicit backpressure protocol (PM-1123).&#160; &lt;/p&gt;</comment>
                            <comment id="2033172" author="acm" created="Mon, 15 Oct 2018 18:37:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ben.caimano&quot; class=&quot;user-hover&quot; rel=&quot;ben.caimano&quot;&gt;ben.caimano&lt;/a&gt; - Queueing this up for you for next sprint as DWS.&lt;/p&gt;</comment>
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            <issuekey id="92215">SERVER-10982</issuekey>
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