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    <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>[DOCS-13014] Investigate changes in SERVER-40954:  On v4.0 if FCV is set to 3.6 rollback fails with &quot;No stable timestamp available to recover to&quot; after a restart</title>
                <link>https://jira.mongodb.org/browse/DOCS-13014</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;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    In case this is not documented: if you freshly upgraded to 4.0 but need to roll back, you may be unable to complete the rollback. In this case, you must downgrade the binary version to 3.6 to let the rollback finish, after which you may upgrade again.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    In a replica set with all nodes on v4.0 binary version and in FCV=3.6, a clean shutdown will cause a node to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/0800a6bb4af2ec7e4439a70e58d23c46ffe2381d/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L767-L780&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set its recovery timestamp to 0&lt;/a&gt;. If this happens for a node whose oplog has diverged (i.e. needs to enter rollback), this node won&apos;t be able to complete the rollback since it does not have a stable timestamp to roll back to which is needed for recover-to-timestamp. Furthermore, in order to take a new stable checkpoint, it would have to commit a new majority write, which it shouldn&apos;t be able to do until it completes the rollback. It also shouldn&apos;t be able to upgrade to FCV=4.0 until the node can completes the rollback and replicate new log entries from the primary. If FCV=3.6 and we encounter this situation, falling back on the rollbackViaFetch algorithm may be the appropriate solution. Another alternative may be to always use rollbackViaRefetch whenever FCV=3.6.&lt;/p&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;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="918064">DOCS-13014</key>
            <summary>Investigate changes in SERVER-40954:  On v4.0 if FCV is set to 3.6 rollback fails with &quot;No stable timestamp available to recover to&quot; after a restart</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>docs-onboarding-candidate</label>
                            <label>docs-replication</label>
                    </labels>
                <created>Thu, 5 Sep 2019 21:09:46 +0000</created>
                <updated>Mon, 13 Nov 2023 18:16:28 +0000</updated>
                                                            <fixVersion>4.0.13</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940429" author="edu.bot" created="Mon, 31 Oct 2022 16:05:16 +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>
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