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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-31189] fassert if feature compatibility version changes during rollback</title>
                <link>https://jira.mongodb.org/browse/SERVER-31189</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Rollback will not work if there are a mix of UUID and non-UUID operations in the oplog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="430110">SERVER-31189</key>
            <summary>fassert if feature compatibility version changes during rollback</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="judah.schvimer@mongodb.com">Judah Schvimer</assignee>
                                    <reporter username="judah.schvimer@mongodb.com">Judah Schvimer</reporter>
                        <labels>
                    </labels>
                <created>Wed, 20 Sep 2017 20:51:25 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:27 +0000</updated>
                            <resolved>Fri, 20 Oct 2017 14:46:56 +0000</resolved>
                                                    <fixVersion>3.6.0-rc1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1704740" author="xgen-internal-githook" created="Fri, 20 Oct 2017 14:45:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;judah@mongodb.com&apos;, &apos;name&apos;: &apos;Judah Schvimer&apos;, &apos;username&apos;: &apos;judahschvimer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31189&quot; title=&quot;fassert if feature compatibility version changes during rollback&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31189&quot;&gt;&lt;del&gt;SERVER-31189&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31426&quot; title=&quot;Fail write to fCV document if admin.system.version collection does not have UUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31426&quot;&gt;&lt;del&gt;SERVER-31426&lt;/del&gt;&lt;/a&gt; fail rollback on downgrade&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b3d26b5f94636870f75b92582d6b7c31190a1295&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b3d26b5f94636870f75b92582d6b7c31190a1295&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1687231" author="judah.schvimer" created="Mon, 2 Oct 2017 22:40:30 +0000"  >&lt;p&gt;This is not a problem for upgrade since we will use the &quot;rollback via refetch with no UUIDs&quot; algorithm while in fCV 3.4 and only start using the UUID version once the last UUID collMod cannot be rolled back. &lt;/p&gt;

&lt;p&gt;As a result, we only need to crash on downgrade. Since this is an uncommon scenario, we will simplify this ticket to crash anytime we see a downgrade op when not in SECONDARY.&lt;/p&gt;</comment>
                            <comment id="1678145" author="judah.schvimer" created="Wed, 20 Sep 2017 21:10:27 +0000"  >&lt;p&gt;We actually have to see what&apos;s happening on the sync source, which makes this more complicated. If the sync source downgrades during rollback then rollback&apos;s queries by UUID will fail even though the documents exist. I&apos;m not sure if we error or ignore the &quot;missing document&quot; in this case since it would look identical to the collection being dropped on the sync source, which should just be ignored.&lt;/p&gt;

&lt;p&gt;If the only fCV/schema version change is on the rolling back node, we may actually be fine just using &quot;rollback via refetch without UUIDs&quot;.&lt;/p&gt;</comment>
                            <comment id="1678126" author="milkie" created="Wed, 20 Sep 2017 20:53:41 +0000"  >&lt;p&gt;By &quot;changes&quot;, do you mean an update to the admin.system.version collection is rolled back?  I feel like that&apos;s the only way the FCV value could change.&lt;/p&gt;</comment>
                    </comments>
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                    <name>Depends</name>
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                                        <issuelink>
            <issuekey id="425910">SERVER-31019</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="444571">SERVER-31531</issuekey>
        </issuelink>
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                    <name>Related</name>
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                                        <issuelink>
            <issuekey id="441381">SERVER-31426</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="454161">SERVER-31805</issuekey>
        </issuelink>
                            </outwardlinks>
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            <issuekey id="440472">SERVER-31384</issuekey>
        </issuelink>
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