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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>[SERVER-49018] v4.4 FCV downgrade must check that no recordPreImages flag is set on any collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-49018</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently on v4.4, a v4.4 FCV 4.4 node can&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;set recordPreImages on a collection&lt;/li&gt;
	&lt;li&gt;downgrade FCV from 4.4 to 4.2&lt;/li&gt;
	&lt;li&gt;shutdown and restart, in FCV 4.2, and find that recordPreImages is set on a collection, which crashes the node on startup.&lt;br/&gt;
We shouldn&apos;t have any possible crashing behavior. And I&apos;m not sure there&apos;s a recovery path, unless v4.2 binaries ignore unknown fields in collection options.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;There is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1a1c21a2bc55e8738c68df65674b0e9c9c61ef1a/jstests/noPassthrough/record_preimage_startup_validation.js#L64-L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a test that showcases this FCV 4.2 crashing on startup behavior&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;The setFeatureCompatibilityVersion command has hooks for FCV downgrade and upgrade checks and changes. A hook should be added to the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/10e8af0774e24dce015b7bc216691ad17a3d2532/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L294-L442&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;downgrade code&lt;/a&gt; to check that the recordPreImages flag is not set on any collection.&lt;/p&gt;

&lt;p&gt;Alternatively, the flag could be unset on downgrade, but I&apos;m not familiar with the feature repercussions that might cause.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1386044">SERVER-49018</key>
            <summary>v4.4 FCV downgrade must check that no recordPreImages flag is set on any collection</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Jun 2020 18:23:46 +0000</created>
                <updated>Tue, 6 Dec 2022 02:21:26 +0000</updated>
                            <resolved>Thu, 17 Sep 2020 19:47:54 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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            <issuekey id="1384070">SERVER-48971</issuekey>
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            <issuekey id="1404053">SERVER-49366</issuekey>
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