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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-2924] Document the downgrade steps for a sharded cluster</title>
                <link>https://jira.mongodb.org/browse/DOCS-2924</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/master/release-notes/2.6-upgrade&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/master/release-notes/2.6-upgrade&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Apart from downgrading Authentication model, Text index and 2dsphere index, the downgrade order should be opposite with the upgrade order, so it should be:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Downgrade each shard using rolling downgrade.&lt;/li&gt;
	&lt;li&gt;Downgrade the config servers. The first config server in the &lt;tt&gt;mongos --configdb&lt;/tt&gt; argument should be downgraded last.&lt;/li&gt;
	&lt;li&gt;Downgrade the mongos. It looks like there is no metadata change from v4 to v5, so the downgrade should be just a binary drop-in replacement.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It would be nice if we can document these steps.&lt;/p&gt;</description>
                <environment></environment>
        <key id="121575">DOCS-2924</key>
            <summary>Document the downgrade steps for a sharded 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="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="linda.qin@mongodb.com">Linda Qin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 17 Mar 2014 06:34:10 +0000</created>
                <updated>Thu, 20 Mar 2014 15:14:02 +0000</updated>
                            <resolved>Thu, 20 Mar 2014 15:13:56 +0000</resolved>
                                                    <fixVersion>v1.3.2</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="519992" author="xgen-internal-githook" created="Thu, 20 Mar 2014 15:13:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-2924&quot; title=&quot;Document the downgrade steps for a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-2924&quot;&gt;&lt;del&gt;DOCS-2924&lt;/del&gt;&lt;/a&gt; additional downgrade procedures&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/bf2a866f1238b17e9f54245492cced23f3ce917f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/bf2a866f1238b17e9f54245492cced23f3ce917f&lt;/a&gt;&lt;/p&gt;</comment>
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