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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-29370] add schema upgrade/downgrade phase to mongod setFeatureCompatibilityVersion command</title>
                <link>https://jira.mongodb.org/browse/SERVER-29370</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This involves adding a &lt;tt&gt;schemaVersion&lt;/tt&gt; read-only global parameter (see &lt;tt&gt;FeatureCompatibility&lt;/tt&gt; in &lt;tt&gt;server_options.h&lt;/tt&gt; ). &lt;/p&gt;

&lt;p&gt;In &lt;tt&gt;setFeatureCompatiblityCommand&lt;/tt&gt;, for the upgrade case, first upgrade the &lt;tt&gt;schemaVersion&lt;/tt&gt; and then iterate over all collections in the catalog, and perform an empty &lt;tt&gt;collMod&lt;/tt&gt; command on each. In turn &lt;tt&gt;collMod&lt;/tt&gt; should call a new &lt;tt&gt;CollectionCatalogEntry::updateUUID()&lt;/tt&gt; method, which assigns a new UUID if there is none and the schema is 3.6, or removes it if there is one and the schema is 3.4. In both cases persist the new UUID, and on commit update the copy in the catalog using a new &lt;tt&gt;Collection::updateUUID()&lt;/tt&gt; method.&lt;/p&gt;

&lt;p&gt;In &lt;tt&gt;userCreateNSImpl&lt;/tt&gt;, the &lt;tt&gt;schemaVersion&lt;/tt&gt; should be used (in addition to the temporary &lt;tt&gt;enableCollectionUUIDs&lt;/tt&gt; parameter) to determine whether to assign UUIDs or not.&lt;/p&gt;</description>
                <environment></environment>
        <key id="386910">SERVER-29370</key>
            <summary>add schema upgrade/downgrade phase to mongod setFeatureCompatibilityVersion command</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="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="geert.bosch@mongodb.com">Geert Bosch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 May 2017 14:45:39 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:31 +0000</updated>
                            <resolved>Tue, 25 Jul 2017 21:42:38 +0000</resolved>
                                                    <fixVersion>3.5.11</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1631699" author="xgen-internal-githook" created="Tue, 25 Jul 2017 21:32:38 +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-29370&quot; title=&quot;add schema upgrade/downgrade phase to mongod setFeatureCompatibilityVersion command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29370&quot;&gt;&lt;del&gt;SERVER-29370&lt;/del&gt;&lt;/a&gt; Update UUIDs when featureCompatibilityVersion is changed&lt;/p&gt;

&lt;p&gt;This patch ensures collections have UUIDs when&lt;br/&gt;
featureCompatibilityVersion is 3.6 and collections do not have UUIDs&lt;br/&gt;
when featureCompatibilityVersion is 3.4 (or below).&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b2ef59c4fa30c2e242840cc1aa55de3c8cdfa887&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b2ef59c4fa30c2e242840cc1aa55de3c8cdfa887&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="392982">SERVER-29569</issuekey>
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            <issuekey id="353588">SERVER-27993</issuekey>
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            <issuekey id="353590">SERVER-27994</issuekey>
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