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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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<item>
            <title>[SERVER-29569] Store the featureCompatibilityVersion server parameter before writing the document  on downgrade</title>
                <link>https://jira.mongodb.org/browse/SERVER-29569</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;2 phase drop is going to only do 2 phase drops when in featureCompatibilityVersion 3.6. The w:majority write during downgrade will make sure that all of those drops are committed before downgrading to 3.4 and prevent undropped collections from sticking around. There is currently a race between when the w:majority-write is written and when the featureCompatibilityVersion server parameter is set, such that we could start a new 2 phase drop in that window that would never get cleaned up because we downgrade before it&apos;s fully dropped.&lt;/p&gt;

&lt;p&gt;It should be safe to set the server parameter first on downgrade and then write the w:majority document to ensure no new 2 phase drops are begun.&lt;/p&gt;</description>
                <environment></environment>
        <key id="392982">SERVER-29569</key>
            <summary>Store the featureCompatibilityVersion server parameter before writing the document  on downgrade</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="13202">Works as Designed</resolution>
                                        <assignee username="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Jun 2017 19:02:18 +0000</created>
                <updated>Fri, 27 Oct 2023 13:54:25 +0000</updated>
                            <resolved>Wed, 12 Jul 2017 19:34:35 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1620372" author="maria.vankeulen" created="Wed, 12 Jul 2017 19:34:35 +0000"  >&lt;p&gt;The work being done for both &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29370&quot; title=&quot;add schema upgrade/downgrade phase to mongod setFeatureCompatibilityVersion command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29370&quot;&gt;&lt;del&gt;SERVER-29370&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30117&quot; title=&quot;FeatureCompatibilityVersion::onInsertOrUpdate should only write to the server parameter on commit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30117&quot;&gt;&lt;del&gt;SERVER-30117&lt;/del&gt;&lt;/a&gt; addresses issues related to races between writing to the featureCompatibilityVersion document and the corresponding server parameter. I am closing this as works as designed since it is no longer an issue for 2-phase-drop.&lt;/p&gt;</comment>
                            <comment id="1614444" author="judah.schvimer" created="Wed, 5 Jul 2017 18:50:34 +0000"  >&lt;p&gt;2-phase-drop will no longer be gated by FCV, so I&apos;m removing this from the epic. This may still be a bug in upgrade-downgrade, and so I&apos;m moving it to the storage backlog.&lt;/p&gt;</comment>
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