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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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            <title>[DOCS-6873] Upgrade and downgrade replication protocol version</title>
                <link>https://jira.mongodb.org/browse/DOCS-6873</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;There&apos;re some caveat of upgrade and downgrade protocol version.&lt;/p&gt;

&lt;p&gt;1. They should (at least downgrade) should happen in isolation with no other config changes. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21744&quot; title=&quot;Clients may fail to discover new primaries when clock skew between nodes is greater than electionTimeout&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21744&quot;&gt;&lt;del&gt;SERVER-21744&lt;/del&gt;&lt;/a&gt;.&lt;br/&gt;
2. With old drivers released before &lt;a href=&quot;https://jira.mongodb.org/browse/DRIVERS-279&quot; title=&quot;Use setVersion and electionId to detect stale primaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DRIVERS-279&quot;&gt;&lt;del&gt;DRIVERS-279&lt;/del&gt;&lt;/a&gt; is resolved, clients have to restart to observe the primary after downgrade.&lt;br/&gt;
3. Re-upgrade after downgrade shouldn&apos;t start until all nodes are in protocol version 0 by using rs.status(). Otherwise, the re-upgrade may observe oplogs in previous upgrade, rolling back new committed oplogs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="245019">DOCS-6873</key>
            <summary>Upgrade and downgrade replication protocol version</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Dec 2015 20:16:13 +0000</created>
                <updated>Mon, 30 Oct 2023 21:38:00 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:00:42 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4943544" author="edu.bot" created="Tue, 1 Nov 2022 11:00:39 +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>
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