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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-34575] Don&apos;t downgrade to 3.6 if startup replication recovery was not run.</title>
                <link>https://jira.mongodb.org/browse/SERVER-34575</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider the following scenario (kudos &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shane.harvey&quot; class=&quot;user-hover&quot; rel=&quot;shane.harvey&quot;&gt;shane.harvey&lt;/a&gt; and MongoOrchestration):&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Bring up a 4.0 binary on 3.6 data files (or, start a new sharded cluster which starts out in FCV 3.6)&lt;/li&gt;
	&lt;li&gt;Take a first stable checkpoint&lt;/li&gt;
	&lt;li&gt;Upgrade to FCV 4.0&lt;/li&gt;
	&lt;li&gt;Do some writes&lt;/li&gt;
	&lt;li&gt;Crash&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Running &lt;tt&gt;`./mongod --repair`&lt;/tt&gt; will not run replication recovery, leaving the FCV value in 3.6. When the node shuts down, it will downgrade to 3.6. This will take an unstable checkpoint, unsetting the WT recovery timestamp. However, none of the &quot;Do some writes&quot; (nor the FCV upgrade) will persist in the checkpoint. Restarting a 4.0 binary will believe the data is consistent at the top of oplog, when it actually needs to recover from the now deleted WT recover timestamp.&lt;/p&gt;

&lt;p&gt;A 4.0 binary must not downgrade if replication recovery was not run.&lt;/p&gt;</description>
                <environment></environment>
        <key id="531229">SERVER-34575</key>
            <summary>Don&apos;t downgrade to 3.6 if startup replication recovery was not run.</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Thu, 19 Apr 2018 19:45:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:34 +0000</updated>
                            <resolved>Fri, 4 May 2018 14:11:00 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1882903" author="xgen-internal-githook" created="Fri, 4 May 2018 14:10:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34575&quot; title=&quot;Don&amp;#39;t downgrade to 3.6 if startup replication recovery was not run.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34575&quot;&gt;&lt;del&gt;SERVER-34575&lt;/del&gt;&lt;/a&gt;: Only downgrade to 3.6 when oplog was replayed on startup.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c0d6b410b15227051ca96dc54f8d6c1df77630cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c0d6b410b15227051ca96dc54f8d6c1df77630cf&lt;/a&gt;&lt;/p&gt;</comment>
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