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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-19689] mongos dead peer detection</title>
                <link>https://jira.mongodb.org/browse/SERVER-19689</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently there is no socket timeout option for mongos connections to the mongod.  In the event of a mongod failure, the convergence time is increased as the TCP socket needs to close completely.&lt;/p&gt;

&lt;p&gt;The delay can is exacerbated when there is a slow query or idle connection, as there is no &quot;keep alive&quot; packet to detect a socket timeout.&lt;/p&gt;</description>
                <environment></environment>
        <key id="223554">SERVER-19689</key>
            <summary>mongos dead peer detection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="luke.prochazka@mongodb.com">Luke Prochazka</reporter>
                        <labels>
                            <label>AdiZ</label>
                    </labels>
                <created>Fri, 31 Jul 2015 06:42:08 +0000</created>
                <updated>Tue, 12 Dec 2023 15:49:53 +0000</updated>
                                            <version>3.0.5</version>
                                                    <component>Networking</component>
                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="993998" author="adamaflynn" created="Fri, 31 Jul 2015 16:31:12 +0000"  >&lt;p&gt;Specifically, the behaviour I&apos;d like to see here is closing connections when a mongod is marked &lt;tt&gt;DOWN&lt;/tt&gt; within a replica set. In the case of a hard server failure where open connections aren&apos;t closed, the election happens within about 30s but mongos (and the app) stall for min(server reboot time, OS TCP keepalive timeout, time to manually restart mongos). In default configurations, TCP keepalive timeout is pretty huge.&lt;/p&gt;

&lt;p&gt;In the case of hardware failure (where you can&apos;t immediately reboot the server), the smallest term in there is probably time for an operator to restart mongos (5-10+ minutes if you have to page someone). If you can immediately reboot the server, it&apos;s still a 5-minute delay.&lt;/p&gt;

&lt;p&gt;Since &lt;tt&gt;ReplicaSetMonitorWatcher&lt;/tt&gt; knows the &lt;tt&gt;mongod&lt;/tt&gt; is down within about 30s, convergence times can be improved by an order of magnitude by having detection of a &lt;tt&gt;DOWN&lt;/tt&gt; member preempt all of its open connections currently blocking in &lt;tt&gt;recv&lt;/tt&gt;.&lt;/p&gt;</comment>
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