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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-4484] Document that mongoS no longer pins connections to secondaries</title>
                <link>https://jira.mongodb.org/browse/DOCS-4484</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;As of server 2.8 and server 2.6.4, mongoS no longer pins secondary connections to allow changes in read preferences between queries.&lt;/p&gt;

&lt;p&gt;Special attention, from ticket: &quot;As these changes could not be backported to 2.6, a different fix was implemented specifically for 2.6: a new mongos server parameter, internalDBClientRSReselectNodePercentage was introduced. This can be set to any value from 0 to 100 (defaults to 0) and represents the probability (expressed in percentage) of a replica set connection in mongos to reevaluate replica set node selection from scratch, regardless of the compatibility of the current read preference to the last-used secondary node. Extra care should be taken since reselecting a replica set node will destroy the old connection and create a new connection. This means in extreme cases (for example, 100%), mongos can be creating and destroying connections for every read request.&quot;&lt;/p&gt;

&lt;p&gt;Text re: pinning at &lt;a href=&quot;http://docs.mongodb.org/manual/core/read-preference-mechanics/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/read-preference-mechanics/&lt;/a&gt; should be changed.&lt;/p&gt;

&lt;p&gt;See linked.&lt;/p&gt;</description>
                <environment></environment>
        <key id="173224">DOCS-4484</key>
            <summary>Document that mongoS no longer pins connections to secondaries</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="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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="michael.paik">Michael Paik</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 Dec 2014 15:41:21 +0000</created>
                <updated>Mon, 16 Mar 2015 23:53:17 +0000</updated>
                            <resolved>Mon, 22 Dec 2014 18:41:57 +0000</resolved>
                                                    <fixVersion>v1.3.16</fixVersion>
                    <fixVersion>mongodb-2.6</fixVersion>
                    <fixVersion>mongodb-3.0</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="788943" author="xgen-internal-githook" created="Wed, 17 Dec 2014 21:58:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4484&quot; title=&quot;Document that mongoS no longer pins connections to secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4484&quot;&gt;&lt;del&gt;DOCS-4484&lt;/del&gt;&lt;/a&gt;: release notes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8f9e16e7a218aaa50f14b6983b72e5c0ee4e8a6e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8f9e16e7a218aaa50f14b6983b72e5c0ee4e8a6e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="788942" author="xgen-internal-githook" created="Wed, 17 Dec 2014 21:58:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4484&quot; title=&quot;Document that mongoS no longer pins connections to secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4484&quot;&gt;&lt;del&gt;DOCS-4484&lt;/del&gt;&lt;/a&gt;: read preference change for mongos&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/01e2614bf25e57b2bf121f2e3d654f648e61952d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/01e2614bf25e57b2bf121f2e3d654f648e61952d&lt;/a&gt;&lt;/p&gt;</comment>
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