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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-30993] Setting featureCompatibilityVersion to 3.4 should remove UUIDs even if existing featureCompatibilityVersion is 3.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-30993</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When setting &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; to 3.4, we only remove UUIDs if the existing &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; was 3.6. However, if we crash between setting the &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; to 3.4 and completing removing UUIDs, then if we run the &lt;tt&gt;setFeatureCompatibilityVersion&lt;/tt&gt; command again, we will not attempt to finish removing UUIDs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="424851">SERVER-30993</key>
            <summary>Setting featureCompatibilityVersion to 3.4 should remove UUIDs even if existing featureCompatibilityVersion is 3.4</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="13201">Fixed</resolution>
                                        <assignee username="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Sep 2017 18:06:23 +0000</created>
                <updated>Mon, 30 Oct 2023 23:13:45 +0000</updated>
                            <resolved>Thu, 21 Sep 2017 18:05:40 +0000</resolved>
                                                    <fixVersion>3.5.13</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1678925" author="xgen-internal-githook" created="Thu, 21 Sep 2017 17:21:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;name&apos;: &apos;Louis Williams&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30993&quot; title=&quot;Setting featureCompatibilityVersion to 3.4 should remove UUIDs even if existing featureCompatibilityVersion is 3.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30993&quot;&gt;&lt;del&gt;SERVER-30993&lt;/del&gt;&lt;/a&gt; Always remove UUIDs when setting featureCompatibilityVersion to 3.4&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/532ab3543012436e8274740301f29457ee4e9fdb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/532ab3543012436e8274740301f29457ee4e9fdb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1668222" author="spencer" created="Fri, 8 Sep 2017 17:36:04 +0000"  >&lt;p&gt;Yep, that&apos;s correct.  We never formalized the notion of schemaVersion but conceptually it still applies.  Schema version 3.6 basically means that UUIDs are present.  Upgrading from 3.4-&amp;gt;3.6 first goes from SV3.4, FCV3.4 -&amp;gt; SV3.6 , fcv3.4 by adding UUIDS, then there&apos;s a second step to go from SV3.6, FCV3.4 -&amp;gt; SV3.6, FCV3.6.  Downgrading does the same steps in reverse.  The setFeatureCompatibilityVersion command does both of these steps in one execution, but if you crash in the middle you could be left partway through, so you need to keep running the command until you get an &apos;ok&apos; status for it to be successful.&lt;/p&gt;</comment>
                            <comment id="1667279" author="tess.avitabile" created="Thu, 7 Sep 2017 18:22:10 +0000"  >&lt;p&gt;When changing &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; from 3.4 to 3.6, we generate UUIDs before changing the &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt;. When changing &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; from 3.6 to 3.4, we generate UUIDs after changing &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt;. IIRC, this is so that when the &lt;tt&gt;featureCompatibilityVersion&lt;/tt&gt; is 3.6, we can be certain that all collections have UUIDs and use this information for rollback.&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=spencer&quot; class=&quot;user-hover&quot; rel=&quot;spencer&quot;&gt;spencer&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1667275" author="milkie" created="Thu, 7 Sep 2017 18:15:58 +0000"  >&lt;p&gt;Why would we write the fcv document durably before we had finished doing the tasks necessary to downgrade to fcv 3.4?  I thought we would write the document last, in order to avoid this scenario.&lt;/p&gt;</comment>
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