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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-34482] system.indexes 3.4 to 3.6 upgrade semantics on wiredTiger may cause mongod 4.0 to fail to start up</title>
                <link>https://jira.mongodb.org/browse/SERVER-34482</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;system.indexes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.4/src/mongo/db/catalog/coll_mod.cpp#L426-L429&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does not receive&lt;/a&gt; a UUID upon setFCV from 3.4 to 3.6 regardless of storage engine. Mongod 4.0 only &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a16f90edd5339d3f58bec24e2a1639c0b2fd938e/src/mongo/db/repair_database_and_check_version.cpp#L144-L148&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;exempts system.indexes&lt;/a&gt; from the UUID startup check if the storage engine is MMAP. This means that if a user creates system.indexes on mongod 3.4 or earlier when using wiredTiger, upgrades to mongod 3.6, then upgrades to mongod 4.0, mongod 4.0 will fail to startup.&lt;/p&gt;

&lt;p&gt;One solution to avoid this issue is to drop system.indexes on startup if it fails the UUID check.&lt;/p&gt;</description>
                <environment></environment>
        <key id="526887">SERVER-34482</key>
            <summary>system.indexes 3.4 to 3.6 upgrade semantics on wiredTiger may cause mongod 4.0 to fail to start up</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Apr 2018 21:51:22 +0000</created>
                <updated>Sun, 29 Oct 2023 22:32:41 +0000</updated>
                            <resolved>Mon, 30 Apr 2018 18:50:38 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1879265" author="xgen-internal-githook" created="Tue, 1 May 2018 17:19:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;name&apos;: &apos;Maria van Keulen&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34482&quot; title=&quot;system.indexes 3.4 to 3.6 upgrade semantics on wiredTiger may cause mongod 4.0 to fail to start up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34482&quot;&gt;&lt;del&gt;SERVER-34482&lt;/del&gt;&lt;/a&gt; Don&apos;t run test on MMAP&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cd5653b7c9ab89db8c1770714b269b7b00609551&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cd5653b7c9ab89db8c1770714b269b7b00609551&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1878130" author="xgen-internal-githook" created="Mon, 30 Apr 2018 17:48:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;maria@mongodb.com&apos;, &apos;username&apos;: &apos;mvankeulen94&apos;, &apos;name&apos;: &apos;Maria van Keulen&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34482&quot; title=&quot;system.indexes 3.4 to 3.6 upgrade semantics on wiredTiger may cause mongod 4.0 to fail to start up&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34482&quot;&gt;&lt;del&gt;SERVER-34482&lt;/del&gt;&lt;/a&gt; Drop MMAP-specific system collections on wiredTiger&lt;/p&gt;

&lt;p&gt;It is possible for a user to explicitly create MMAP-specific system&lt;br/&gt;
collections when using wiredTiger. The presence of these collections&lt;br/&gt;
may cause UUID checks to fail.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a2217a54d59c5d97e9e79cc40639c2589a18deb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a2217a54d59c5d97e9e79cc40639c2589a18deb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1873065" author="maria.vankeulen" created="Tue, 24 Apr 2018 19:01:36 +0000"  >&lt;p&gt;In light of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32894&quot; title=&quot;Disallow creation of `system.indexes`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32894&quot;&gt;&lt;del&gt;SERVER-32894&lt;/del&gt;&lt;/a&gt;, I think we should consider dropping system.indexes and system.namespaces on wiredTiger regardless of whether they pass the UUID check.&lt;/p&gt;</comment>
                            <comment id="1864294" author="maria.vankeulen" created="Fri, 13 Apr 2018 21:53:00 +0000"  >&lt;p&gt;I do not believe it is possible to create system.namespaces on (non-MMAP) mongod 3.4, but if it is possible for system.namespaces to exist on a non-MMAP mongod 3.4 node, system.namespaces will have this issue as well.&lt;/p&gt;</comment>
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