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        <build-date>13-04-2023</build-date>
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            <title>[DOCS-7779] Rollbacks can occur on members that have never been Primary</title>
                <link>https://jira.mongodb.org/browse/DOCS-7779</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;RE: &lt;a href=&quot;https://docs.mongodb.org/manual/core/replica-set-rollbacks/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.org/manual/core/replica-set-rollbacks/&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;A rollback reverts write operations on a former primary when the member ...&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This wording suggests that being a former Primary is a requirement. It isn&apos;t. A member that has only ever been secondary can experience a rollback, even a hidden member can be forced to perform a rollback.&lt;/p&gt;

&lt;p&gt;Example:&lt;br/&gt;
Take a 5 member, all data-bearing, replica-set. Issue constant stream of writes to the Primary. Now network partition such that the Primary and one Secondary (perhaps even hidden) get isolated together. These can continue taking writes for a brief period, and the nearby Secondary will replicate these writes (this occurs &lt;b&gt;regardless&lt;/b&gt; of WriteConcern, though those clients will not receive any confirmation when w=&apos;majority&apos; because it can&apos;t be satisfied). When the split is detected by each group, the Primary steps down and the other group will independently elect a new Primary - which can take writes. If writes are made to the new Primary before the split is solved, then a rollback is required on the &quot;old Primary&quot;... but so is a rollback required on its nearby Secondary - a member which has &lt;em&gt;never been Primary&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;Dunno if we want to express all of this, but we need to weaken the description that a rollback occurs on a &quot;former Primary&quot; etc.&lt;/p&gt;</description>
                <environment></environment>
        <key id="283538">DOCS-7779</key>
            <summary>Rollbacks can occur on members that have never been Primary</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                    </labels>
                <created>Sat, 30 Apr 2016 06:44:51 +0000</created>
                <updated>Mon, 30 Oct 2023 21:33:02 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4941041" author="edu.bot" created="Mon, 31 Oct 2022 16:14:12 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1251168" author="andrew.ryder@10gen.com" created="Sat, 30 Apr 2016 06:58:09 +0000"  >&lt;p&gt;The rollback contents of a secondary also do not have to match those of any other member. There is no assurance in the use case above that the co-located secondary replicated &lt;em&gt;all&lt;/em&gt; of the writes the incumbent Primary accepted before it stepped down. Thus, it may have different contents in the rollback directory. With that said, I don&apos;t think it&apos;s possible for a secondary to have meaningfully different rollback content. If all members survive the event (not destroyed by fire/flood/pestilence/etc) then only former Primaries have &lt;em&gt;meaningful&lt;/em&gt; rollback directories.&lt;/p&gt;</comment>
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