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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>[DOCS-12560] Docs for SERVER-39221: Test rollback after enableMajorityReadConcern upgrade/downgrade</title>
                <link>https://jira.mongodb.org/browse/DOCS-12560</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;This commit includes a test rollback_after_enabling_majority_reads.js that documents the behavior of entering ROLLBACK immediately after upgrading enableMajorityReadConcern to true. This can fassert if it attempts to roll back operations that were included in the last stable checkpoint when enableMajorityReadConcern was false. If this happens, the user can restart the server with enableMajorityReadConcern=false to complete the rollback, then upgrade again to enableMajorityReadConcern=true.&lt;/p&gt;

&lt;p&gt;It might not be necessary to include this in our user-facing documentation, but I would like to ensure that TSEs know. I will inform the TSE organization of this issue.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;We have coverage for toggling &lt;tt&gt;enableMajorityReadConcern&lt;/tt&gt; in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/aaa64733625433f31a5e212f4652a58816385388/jstests/noPassthrough/disable_majority_reads_restart.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;disable_majority_reads_restart.js&lt;/a&gt;. However, we do not have coverage for rollbacks after toggling. We should add test coverage to determine what the behavior is and decide whether the behavior is acceptable.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

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        <key id="720240">DOCS-12560</key>
            <summary>Docs for SERVER-39221: Test rollback after enableMajorityReadConcern upgrade/downgrade</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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                            <label>docs-4.2-noop</label>
                    </labels>
                <created>Wed, 20 Mar 2019 23:37:29 +0000</created>
                <updated>Mon, 13 Nov 2023 18:24:08 +0000</updated>
                            <resolved>Wed, 7 Aug 2019 01:20:45 +0000</resolved>
                                                    <fixVersion>4.1.10</fixVersion>
                    <fixVersion>4.0.10</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2360599" author="kay.kim@10gen.com" created="Wed, 7 Aug 2019 01:20:45 +0000"  >&lt;p&gt;For now, I do not believe this specific case needs to be documented.  However, will keep an eye out in case we need to revisit the decision.&lt;/p&gt;</comment>
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