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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-33151] Refuse to start up mongod 4.0 unless all collections have UUIDs</title>
                <link>https://jira.mongodb.org/browse/SERVER-33151</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 4.0, it is assumed all collections have UUIDs. To ensure no potential 3.4-3.6 related UUID assignment bugs carry over into 4.0 once a user upgrades, all collections should be checked on startup for UUIDs and mongod should fail to start up unless all collections have UUIDs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="493574">SERVER-33151</key>
            <summary>Refuse to start up mongod 4.0 unless all collections have UUIDs</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Feb 2018 00:39:30 +0000</created>
                <updated>Sun, 29 Oct 2023 22:35:03 +0000</updated>
                            <resolved>Mon, 26 Feb 2018 15:15:39 +0000</resolved>
                                                    <fixVersion>3.7.3</fixVersion>
                                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1815964" author="xgen-internal-githook" created="Mon, 26 Feb 2018 15:11:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;, &apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33151&quot; title=&quot;Refuse to start up mongod 4.0 unless all collections have UUIDs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33151&quot;&gt;&lt;del&gt;SERVER-33151&lt;/del&gt;&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33246&quot; title=&quot;Assign UUIDs to non-replicated collections on startup if any are missing UUIDs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33246&quot;&gt;&lt;del&gt;SERVER-33246&lt;/del&gt;&lt;/a&gt; Refuse to start up mongod 4.0 unless all collections have UUIDs&lt;/p&gt;

&lt;p&gt;Also assigns UUIDs to any non-replicated collection found to be missing its UUID.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bebdcf721eaa24fa589977bf48459a8cdd0fb2a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bebdcf721eaa24fa589977bf48459a8cdd0fb2a2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1812917" author="dianna.hohensee" created="Thu, 22 Feb 2018 16:15:39 +0000"  >&lt;p&gt;Ran into an issue where arbiters are upgraded to v4.0 and do not have UUIDs.&lt;/p&gt;

&lt;p&gt;This is due to arbiters in v3.6 only ever setting FCV 3.4. Upgrading the replica set primary FCV to 3.6 is not replicated to an arbiter &amp;#8211; arbiters don&apos;t replicate data! So a v3.6 arbiter doesn&apos;t have UUIDs on its non-replicated collections. And then gets upgraded to v4.0 and still doesn&apos;t have UUIDs, and this check breaks arbiters on that lack of UUIDs.&lt;/p&gt;

&lt;p&gt;Therefore, since we also have the intention to automatically repair non-replicated collection UUIDs per &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33246&quot; title=&quot;Assign UUIDs to non-replicated collections on startup if any are missing UUIDs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33246&quot;&gt;&lt;del&gt;SERVER-33246&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33246&quot; title=&quot;Assign UUIDs to non-replicated collections on startup if any are missing UUIDs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33246&quot;&gt;&lt;del&gt;SERVER-33246&lt;/del&gt;&lt;/a&gt; will have to go in before or with this ticket.&lt;/p&gt;</comment>
                            <comment id="1800994" author="dianna.hohensee" created="Fri, 9 Feb 2018 17:02:12 +0000"  >&lt;p&gt;auto-fix non-replicated collection uuids on startup if needed.&lt;/p&gt;</comment>
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