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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22910] mongos keeps bad connections around to downed hosts </title>
                <link>https://jira.mongodb.org/browse/SERVER-22910</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Due to the split between the legacy connection pool, and the various NetworkInterfaceASIO connection pools, information about network errors is not fully exploited.&lt;/p&gt;

&lt;p&gt;Consider the following scenario:&lt;/p&gt;

&lt;p&gt;In a sharded cluster, one shard is restarted. A client runs a find command against mongos, which fails as a bad connection is used. Mongos then correctly dumps all the connections it has to the shard. The client retries the find and it works. &lt;/p&gt;

&lt;p&gt;However, if the client then runs a &apos;count command&apos; it will then fail, since bad connections to the downed shard are still present in the legacy connection pool. &lt;/p&gt;

&lt;p&gt;The fix here is to drop all pooled connections to a bad host in ALL pools when a network error is detected.&lt;/p&gt;

&lt;p&gt;I have also attached a jstest that reproduces the problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="269091">SERVER-22910</key>
            <summary>mongos keeps bad connections around to downed hosts </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="9">Done</resolution>
                                        <assignee username="backlog-server-servicearch">Backlog - Service Architecture</assignee>
                                    <reporter username="adam.midvidy">Adam Midvidy</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Mar 2016 15:44:29 +0000</created>
                <updated>Tue, 6 Dec 2022 04:32:01 +0000</updated>
                            <resolved>Fri, 16 Feb 2018 16:07:47 +0000</resolved>
                                                                    <component>Networking</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1808100" author="jason.carey" created="Fri, 16 Feb 2018 16:07:47 +0000"  >&lt;p&gt;The new connection pool does drop connections to hosts we haven&apos;t talked to (in a while) and to downed hosts.&lt;/p&gt;

&lt;p&gt;As most user facing functionality has migrated to the TaskExec framework, this is gone away (or will continue to go away with further sharding migration)&lt;/p&gt;</comment>
                            <comment id="1189168" author="adam.midvidy" created="Tue, 1 Mar 2016 15:49:15 +0000"  >&lt;p&gt;The new connection pool does, I&apos;m not sure about the legacy pool. &lt;/p&gt;</comment>
                            <comment id="1189162" author="scotthernandez" created="Tue, 1 Mar 2016 15:47:39 +0000"  >&lt;p&gt;Do the pools reap the dead connections periodically? And if so, would this just speed up that clean up?&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="111262" name="bad_connections_downed_shard.js" size="1340" author="adam.midvidy" created="Tue, 1 Mar 2016 15:44:47 +0000"/>
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