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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-9472] Docs for SERVER-25158: Prevent a 3.2 mongos from joining a featureCompatibilityVersion(&quot;3.4&quot;) cluster</title>
                <link>https://jira.mongodb.org/browse/DOCS-9472</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Engineering Ticket Description:&lt;/p&gt;

&lt;p&gt;When the featureCompatibilityVersion is 3.4, the config servers will return &lt;tt&gt;configsvr:2&lt;/tt&gt; in their &lt;tt&gt;isMaster&lt;/tt&gt; response. This is a config server mode number that 3.2 mongos does not understand. This will prevent 3.2 mongos from connecting to the config servers, and thus will also prevent mongos from starting up against a featureCompatibilityVersion(&quot;3.4&quot;) cluster.&lt;/p&gt;</description>
                <environment></environment>
        <key id="335969">DOCS-9472</key>
            <summary>Docs for SERVER-25158: Prevent a 3.2 mongos from joining a featureCompatibilityVersion(&quot;3.4&quot;) cluster</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="emily.hall">Emily Hall</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Dec 2016 18:18:59 +0000</created>
                <updated>Mon, 30 Oct 2023 21:21:02 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4940854" author="edu.bot" created="Mon, 31 Oct 2022 16:11:57 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1495781" author="stennie" created="Thu, 9 Feb 2017 11:40:53 +0000"  >&lt;p&gt;The &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/isMaster/#output&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;isMaster&lt;/tt&gt; output&lt;/a&gt; currently doesn&apos;t list &lt;tt&gt;configsvr&lt;/tt&gt; values.&lt;/p&gt;

&lt;p&gt;This field will only be present on config servers and indicates which config server protocol is in use:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;0 (or absent): original Sync Cluster Connection Config servers (SCCC); MongoDB 3.2 or earlier.&lt;/li&gt;
	&lt;li&gt;1: Config Server Replica Set (CSRS) with MongoDB 3.2 feature compatibility (either MongoDB 3.2 or a deployment upgraded to 3.4 without setting &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt;)&lt;/li&gt;
	&lt;li&gt;2: CSRS with MongoDB 3.4 feature compatibility (either a new 3.4 install or a deployment with &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; set to 3.4 after upgrade)&lt;/li&gt;
&lt;/ul&gt;
</comment>
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