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    <title>MongoDB Jira</title>
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    <description>This file is an XML representation of an issue</description>
    <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-14330] Document that client affinity is required if a proxy/load balancer between the application and the mongos</title>
                <link>https://jira.mongodb.org/browse/DOCS-14330</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;From the documentation &lt;a href=&quot;https://docs.mongodb.com/v3.2/core/sharded-cluster-components/#production-configuration&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&quot;Sharded Cluster Components&quot;&lt;/a&gt; up to version 3.2, we have mentioned that client affinity is required if load balancer is running between the application and the mongos:&lt;/p&gt;

&lt;p&gt;&amp;gt; You may also deploy a group of mongos instances and use a proxy/load balancer between the application and the mongos. In these deployments, you must configure the load balancer for client affinity so that every connection from a single client reaches the same mongos.&lt;/p&gt;

&lt;p&gt;However, this was no longer mentioned since the &lt;span class=&quot;error&quot;&gt;&amp;#91;v3.4 documentation&amp;#93;&lt;/span&gt;(&lt;a href=&quot;https://docs.mongodb.com/v3.4/core/sharded-cluster-components/#production-configuration&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/v3.4/core/sharded-cluster-components/#production-configuration&lt;/a&gt;). Since this is still a requirement, please add this to the documentation.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
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                <environment></environment>
        <key id="1669300">DOCS-14330</key>
            <summary>Document that client affinity is required if a proxy/load balancer between the application and the mongos</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="ian.fogelman@mongodb.com">Ian Fogelman</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Apr 2021 04:11:23 +0000</created>
                <updated>Mon, 30 Oct 2023 20:10:22 +0000</updated>
                            <resolved>Wed, 8 Feb 2023 14:58:51 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5170379" author="jeff.yemin" created="Mon, 6 Feb 2023 13:11:32 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=linda.qin%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;linda.qin@mongodb.com&quot;&gt;linda.qin@mongodb.com&lt;/a&gt;, the situation is a bit complicated.  The load balancer supported added in DRIVERS-720 required both a driver that supports load balancer mode and a sharded clusters configured to support that mode.    The server support was added in MongoDB 5.0 and the major drivers delivered the feature in the same time frame.  See the language tickets linked to DRIVERS-720 for details.&lt;/p&gt;

&lt;p&gt;In Atlas the only clusters which are currently configured for load balancer support are serverless ones.  I don&apos;t know what has to be done to configure an on-premise sharded cluster for load balancer support, or if that has been documented or advertised.&lt;/p&gt;
</comment>
                            <comment id="3698297" author="spencer.brown" created="Fri, 2 Apr 2021 11:53:36 +0000"  >&lt;p&gt;Can we add a reference to round-robin DNS also? As it cannot support client affinity, it should not be used between the application and the mongos deployment. &lt;/p&gt;</comment>
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