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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9984] MongoS spawns new connections to secondaries after each change of readPreference tags</title>
                <link>https://jira.mongodb.org/browse/SERVER-9984</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Issue is thus:&lt;br/&gt;
Client creates a single connection to MongoS&lt;br/&gt;
Client issues a query with read preference &quot;Secondary&quot; and read preference tag of &quot;a&quot;&lt;br/&gt;
MongoS creates a new connection to secondaries tagged &quot;a&quot; and issues queries&lt;br/&gt;
Client issues a query with read preference &quot;Secondary&quot; and read preference tag of &quot;b&quot;&lt;br/&gt;
MongoS dropps connection to secondaries tagged &quot;a&quot; and opens connections to secondaries tagged &quot;b&quot; then issues queries&lt;br/&gt;
Client issues a query with read preference &quot;Secondary&quot; and read preference tag of &quot;a&quot;&lt;br/&gt;
MongoS dropps connection to secondaries tagged &quot;b&quot; and opens connections to secondaries tagged &quot;a&quot; then issues queries&lt;/p&gt;

&lt;p&gt;If the client continues to change read preference tags then connections will be opened and closed following each query issued on that connection with a new tag. This can lead to large amounts of connection churn.&lt;/p&gt;</description>
                <environment>Sharded cluster &lt;br/&gt;
Replica Sets of 3&lt;br/&gt;
primary and one secondary tagged &amp;quot;a&amp;quot; &lt;br/&gt;
other secondary tagged &amp;quot;b&amp;quot;</environment>
        <key id="79891">SERVER-9984</key>
            <summary>MongoS spawns new connections to secondaries after each change of readPreference tags</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="3">Duplicate</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="david.hows">David Hows</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Jun 2013 05:44:51 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:43 +0000</updated>
                            <resolved>Mon, 30 Jun 2014 17:32:21 +0000</resolved>
                                    <version>2.4.4</version>
                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
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            <issuekey id="56054">SERVER-7629</issuekey>
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