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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>[SERVER-60491] Prevent FCV downgrade from 5.1 to 5.0 in the presence of sharded time-series collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-60491</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="1891663">SERVER-60491</key>
            <summary>Prevent FCV downgrade from 5.1 to 5.0 in the presence of sharded time-series collection</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="arun.banala@mongodb.com">Arun Banala</assignee>
                                    <reporter username="arun.banala@mongodb.com">Arun Banala</reporter>
                        <labels>
                    </labels>
                <created>Wed, 6 Oct 2021 15:17:17 +0000</created>
                <updated>Wed, 13 Oct 2021 15:40:41 +0000</updated>
                            <resolved>Wed, 13 Oct 2021 15:40:41 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4112729" author="david.storch" created="Fri, 8 Oct 2021 13:36:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernard.gorman&quot; class=&quot;user-hover&quot; rel=&quot;bernard.gorman&quot;&gt;bernard.gorman&lt;/a&gt;, that makes sense. You need to be able to get into the &quot;downgrading&quot; state so that new uses of the incompatible feature are blocked, at which point the user may need to take some action before completing the FCV downgrade.&lt;/p&gt;</comment>
                            <comment id="4110196" author="arun.banala" created="Thu, 7 Oct 2021 14:19:47 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=david.storch&quot; class=&quot;user-hover&quot; rel=&quot;david.storch&quot;&gt;david.storch&lt;/a&gt; If the downgrade may result in data corrupt/loss (which would be the case for sharded time-series), I believe we&apos;ve made setFCV command to fail in the past. If we don&apos;t do this, there would be no way for us to check if the users did do the cleanup. I found &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a3836f36f60ed692824bf444eaecc1704fdd57fb/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L700-L718&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; recent example on 5.0, which disallows downgrade to 4.4 if the cluster has a time-series collection. &lt;/p&gt;</comment>
                            <comment id="4110156" author="david.storch" created="Thu, 7 Oct 2021 14:05:49 +0000"  >&lt;p&gt;Wait, is it ever acceptable to prevent the FCV from being downgraded until some action is taken? My understanding is that usually users are supposed to downgrade the FCV and only then perform any necessary cleanup before downgrading the binaries.&lt;/p&gt;</comment>
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