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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-35136] Remove featureCompatibilityVersion document restoration based on UUIDs during --repair</title>
                <link>https://jira.mongodb.org/browse/SERVER-35136</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29452&quot; title=&quot;Handle missing featureCompatibilityVersion document during startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29452&quot;&gt;&lt;del&gt;SERVER-29452&lt;/del&gt;&lt;/a&gt;, the featureCompatibilityVersion document can be restored after being accidentally deleted via --repair. As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29453&quot; title=&quot;Disallow removing the featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29453&quot;&gt;&lt;del&gt;SERVER-29453&lt;/del&gt;&lt;/a&gt;, it is prohibited to remove the FCV document. One danger with having this behavior is it potentially allows users to force an FCV upgrade by removing the FCV document (or using a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ab1592260c9b21d802aa65a11d268c0a97b11a7/jstests/libs/feature_compatibility_version.js#L33&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;workaround&lt;/a&gt; to avoid the handling in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29453&quot; title=&quot;Disallow removing the featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29453&quot;&gt;&lt;del&gt;SERVER-29453&lt;/del&gt;&lt;/a&gt;) and then running --repair with a newer binary version. MongoDB 4.0 handled this risk by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6ab1592260c9b21d802aa65a11d268c0a97b11a7/src/mongo/db/repair_database_and_check_version.cpp#L338-L343&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refusing to repair the FCV&lt;/a&gt; document unless all collections had UUIDs. This handling will not address the risk of someone removing the document in MongoDB 3.6 and then running --repair with MongoDB 4.2. The usefulness of this --repair behavior should be re-evaluated with respect to the risks and costs of keeping it around.&lt;/p&gt;</description>
                <environment></environment>
        <key id="547254">SERVER-35136</key>
            <summary>Remove featureCompatibilityVersion document restoration based on UUIDs during --repair</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Mon, 21 May 2018 20:28:58 +0000</created>
                <updated>Mon, 9 Jul 2018 21:03:22 +0000</updated>
                            <resolved>Mon, 9 Jul 2018 21:03:22 +0000</resolved>
                                                                    <component>Storage</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1942464" author="louis.williams" created="Mon, 9 Jul 2018 21:03:22 +0000"  >&lt;p&gt;Closing because we do not want to prevent repair from completing for any reason, and because this is a very unlikely behavior in 4.2 that we are choosing not to support.&lt;/p&gt;</comment>
                            <comment id="1941089" author="louis.williams" created="Fri, 6 Jul 2018 21:03:32 +0000"  >&lt;p&gt;The work here should be to unconditionally restore the FCV document to the value of the previous version. This is similar to the current behavior, but we will remove the code that uses UUID information to decide which version of the document to restore. For the future, we will no longer use any feature-specific side effects to deduce a data directory&apos;s FCV version.&lt;/p&gt;

&lt;p&gt;Unless the admin.system.version collection were corrupted, the only way the document could be missing is if the user were running on a 3.2 data directory, and we will explicitly not support that.&lt;/p&gt;

&lt;p&gt;In the unlikely event that the document is corrupted, we do not believe a user will have any reason to use a different binary version to run repair than the one they already have. If they do, undefined behavior should expected.&lt;/p&gt;</comment>
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