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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4997] Mongos not clearing stale connections</title>
                <link>https://jira.mongodb.org/browse/SERVER-4997</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We had the following issue on our production environment today:&lt;/p&gt;

&lt;p&gt;Due to a mistake, a mongod process needed to be restarted. This caused the secondary member of the replica set to failover to primary.&lt;br/&gt;
However, after the freshly restarted mongod came back up, another election was held and it was re-elected primary.&lt;/p&gt;

&lt;p&gt;From that point on, it was no longer possible to query a non-sharded DB that resides on the replica set that experienced the restart.&lt;br/&gt;
Connecting to mongos and trying to query the database returned the following error in mongo shell:&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;code&amp;#93;&lt;/span&gt;&lt;br/&gt;
mongos&amp;gt; db.collection.find()&lt;br/&gt;
error: &lt;/p&gt;
{ &quot;$err&quot; : &quot;socket exception&quot;, &quot;code&quot; : 9001 }
&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;code&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;After manually retrying the query by repeating the command over and over (between 20-40 times) in mongo shell, the situation eventually cleared up and queries worked normally again, both from the shell as well as from our application. Unfortunately, this process needed to be repeated for every mongos-instance on the cluster, which is six in total.&lt;/p&gt;

&lt;p&gt;It looks to me as if mongos does not check connections to the cluster&apos;s other members before using them.&lt;br/&gt;
Is it possible to add that functionality?&lt;br/&gt;
It wouldn&apos;t need to check before every use of the connection (though that behaviour might be desirable in some cases, same way it works for connecting to SQL databases from Java using JDBC connection pools), but the administrator shouldn&apos;t need to have to manually sort through.&lt;/p&gt;

&lt;p&gt;Or is it already there and we just haven&apos;t seen the switch for it, yet? &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/wink.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="30875">SERVER-4997</key>
            <summary>Mongos not clearing stale connections</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="-1">Unassigned</assignee>
                                    <reporter username="christian.tonhaeuser@navteq.com">Christian Tonh&#228;user</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Feb 2012 12:23:16 +0000</created>
                <updated>Thu, 6 Apr 2023 18:55:20 +0000</updated>
                            <resolved>Sun, 19 Feb 2012 04:25:27 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="89860" author="eliot" created="Sun, 19 Feb 2012 04:25:20 +0000"  >&lt;p&gt;An admin shouldn&apos;t have to cycle today - but you will get one error per connection.&lt;br/&gt;
There is a case to do this aggressively: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4706&quot; title=&quot;when a socket between mongos and mongod fails, close all connections immediately&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4706&quot;&gt;&lt;del&gt;SERVER-4706&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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