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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-7598] Upgrade Config servers to CSRS - add mongos upgrade step first</title>
                <link>https://jira.mongodb.org/browse/DOCS-7598</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;This came up at my last Consult gig. In the section for Upgrade &lt;a href=&quot;https://docs.mongodb.org/manual/tutorial/upgrade-config-servers-to-replica-set/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;config servers to 3.2 CSRS&lt;/a&gt; it does not say explicitly that &lt;/p&gt;

&lt;p&gt;a) before you upgrade configs to CSRS you need to upgrade mongos to 3.2. This should be step 1 - before stopping the balancer.&lt;br/&gt;
b) it would be nice to add a note that MongoDB &apos;s future direction is to de-support old style configDBs - otherwise customers would expect to have a &quot;backout&quot; steps to old config server step. This should be a paragraph after the last step of upgrade - re-enabble balancer&lt;/p&gt;

&lt;p&gt;In addition, there are two ways we advice to upgrade to CSRS- one with an outage and one without.  These two sections can improve in two ways.&lt;/p&gt;

&lt;p&gt;1) Since most of the steps are common, refer &quot;without downtime&quot;  to the &quot;with downtime&quot; and mention only the differences to make it happen with no downtime.&lt;/p&gt;

&lt;p&gt;2) I like the paragraph for the &quot;without downtime&quot; section clarifying that &quot;no downtime&quot; implies with some limitations --&amp;gt; &quot;During this procedure there will be a period of time where the config servers will be read-only. During this period, certain catalog operations will fail if attempted...&quot; - a similar section should exist for the &quot;with downtime&quot; section too.&lt;/p&gt;</description>
                <environment></environment>
        <key id="278201">DOCS-7598</key>
            <summary>Upgrade Config servers to CSRS - add mongos upgrade step first</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="3">Duplicate</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="sumit.sengupta">Sumit Sengupta</reporter>
                        <labels>
                            <label>configserver</label>
                            <label>csrsupgrade</label>
                            <label>documentation</label>
                    </labels>
                <created>Thu, 7 Apr 2016 15:36:35 +0000</created>
                <updated>Wed, 11 Jan 2017 21:47:24 +0000</updated>
                            <resolved>Sun, 25 Sep 2016 04:16:50 +0000</resolved>
                                    <version>mongodb-3.2</version>
                                    <fixVersion>01112017-cleanup</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1392962" author="kay.kim@10gen.com" created="Sun, 25 Sep 2016 04:16:50 +0000"  >&lt;p&gt;Already have the Prerequisite section.&lt;/p&gt;

&lt;p&gt;For 3.4, will update this page as part of deprecation of support for mirrored config server topology.&lt;/p&gt;</comment>
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