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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-69585] Get rid of the UUID from the database version</title>
                <link>https://jira.mongodb.org/browse/SERVER-69585</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/10gen/mongo/blob/b1d33c08186ae0d6c8dae7f9531c652c2ece1730/src/mongo/s/database_version.idl#L44-L48&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;UUID field&lt;/a&gt; of the database version structure has been logically replaced by the timestamp starting from version 4.9 (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52933&quot; title=&quot;Add timestamp to the DatabaseVersion IDL&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52933&quot;&gt;&lt;del&gt;SERVER-52933&lt;/del&gt;&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;From version 5.2, this field has no reason to exist so it can be removed for clarity.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2133765">SERVER-69585</key>
            <summary>Get rid of the UUID from the database version</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Mon, 12 Sep 2022 09:56:01 +0000</created>
                <updated>Thu, 18 Jan 2024 11:13:22 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4951263" author="JIRAUSER1259062" created="Thu, 3 Nov 2022 11:11:17 +0000"  >&lt;p&gt;There is a backward-compatibility problem, highlighted by the multi-version test suites, that forces us to postpone this change. The problematic case can be summarized with an example:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Using new binary version (that onboards this change), the database &lt;tt&gt;TestDB&lt;/tt&gt; is create and its metadata contains the timestamp (not the UUID).&lt;/li&gt;
	&lt;li&gt;The cluster is downgraded (so, the binaries don&apos;t onboard the changes), the database &lt;tt&gt;TestDB&lt;/tt&gt; is dropped, but the operation fails because &lt;a href=&quot;https://github.com/10gen/mongo/blob/de6eb37f324ca66b48bf0136994a932a62a2a2a1/src/mongo/db/s/drop_database_coordinator.cpp#L71-L74&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the filter to get its metadata uses the UUID&lt;/a&gt; (that is unavailable).&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The proposal is to change the filter used to remove the database metadata using the timestamp in the next version (i.e., &lt;tt&gt;7.0&lt;/tt&gt;) and actually remove the UUID in the following version (i.e., &lt;tt&gt;7.1&lt;/tt&gt;/&lt;tt&gt;8.0&lt;/tt&gt;).&lt;/p&gt;

&lt;p&gt;All the required changes are already &lt;a href=&quot;https://github.com/10gen/mongo/tree/afuschetto/SERVER-69585-get-rid-of-db-version-uuid&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="4936781" author="JIRAUSER1259062" created="Fri, 28 Oct 2022 19:20:39 +0000"  >&lt;p&gt;Assigning back to me as internally discussed. I will include &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pol.pinol%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pol.pinol@mongodb.com&quot;&gt;pol.pinol@mongodb.com&lt;/a&gt; in the development process.&lt;/p&gt;</comment>
                            <comment id="4934961" author="JIRAUSER1259062" created="Fri, 28 Oct 2022 11:41:27 +0000"  >&lt;p&gt;A few weeks ago, I moved back this ticket to the backlog because it requires a little more of investigation. In other words, it&apos;s not probably a quick win as I initially assumed.&lt;/p&gt;

&lt;p&gt;Indeed, to remove the database metadata from the config database, the UUID is currently used as part of the query to ensure the idempotence of the operation. Probably, this can be safely changed by using the database timestamp to query the same data.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is duplicated by">
                                        <issuelink>
            <issuekey id="2543252">SERVER-84758</issuekey>
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            <issuekey id="2174037">SERVER-71052</issuekey>
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