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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-81254] Prevent concurrent enablement of feature flags while upgrading FCVs after branch cut</title>
                <link>https://jira.mongodb.org/browse/SERVER-81254</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;While I was investigating the redness from the FCV upgrade to 7.2, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57414&quot; title=&quot;Enable Feature flag for PM-2322&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57414&quot;&gt;&lt;del&gt;SERVER-57414&lt;/del&gt;&lt;/a&gt; was merged into master, which toggled a feature flag on master. This happened after the 7.1 branch cut but before master was tagged with 7.2.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This caused a significant amount of redness since tests for that feature flag were essentially enabled for clusters with FCV &amp;gt;= 7.1. However, the future git tag variant has lastContinuous = 7.1, and it attempted to get the 7.1 binary by pulling from evergreen. This binary is obtained from the v7.1 branch, which did not yet have the feature flag enabled. As a result, all tests relevant to that feature flag were failing.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This should not be an issue if rapid releases were working as expected and the FCV upgrade happens soon after branch cut. But if anything goes wrong again in the future, we could run into a similar issue.&lt;/p&gt;


&lt;p&gt;As a result, we should block any new feature flags from being enabled between branch cut and upgrading FCV constants. This may not be worthwhile to enforce programmatically, but we should consider adding this to the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/repl/FCV_AND_FEATURE_FLAG_README.md#feature-flags&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;feature flag ReadMe&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2447173">SERVER-81254</key>
            <summary>Prevent concurrent enablement of feature flags while upgrading FCVs after branch cut</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="13201">Fixed</resolution>
                                        <assignee username="xuerui.fa@mongodb.com">Xuerui Fa</assignee>
                                    <reporter username="xuerui.fa@mongodb.com">Xuerui Fa</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Sep 2023 16:49:19 +0000</created>
                <updated>Mon, 8 Jan 2024 18:59:21 +0000</updated>
                            <resolved>Mon, 8 Jan 2024 18:52:02 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5994902" author="xgen-internal-githook" created="Mon, 8 Jan 2024 18:59:21 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Xuerui Fa&apos;, &apos;email&apos;: &apos;xuerui.fa@mongodb.com&apos;, &apos;username&apos;: &apos;XueruiFa&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81254&quot; title=&quot;Prevent concurrent enablement of feature flags while upgrading FCVs after branch cut&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81254&quot;&gt;&lt;del&gt;SERVER-81254&lt;/del&gt;&lt;/a&gt;: Add details about not enabling feature flags after bran&#8230; (#17878)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: e936f74d4ccd4fa6df94344db0744f34e7704f6a&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/19fffa873c24e4d9ca4f2b61f8860054ca0f4cec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/19fffa873c24e4d9ca4f2b61f8860054ca0f4cec&lt;/a&gt;&lt;/p&gt;</comment>
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