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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-57146] Add a way to construct a ComparableDatabaseVersion without a valid DatabaseVersion</title>
                <link>https://jira.mongodb.org/browse/SERVER-57146</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The valid &lt;tt&gt;DatabaseVersion&lt;/tt&gt; will be provided later through &lt;tt&gt;ComparableDatabaseVersion::setVersion&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;This task completes the work started on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56908&quot; title=&quot;Changing at which time the ComparableChunkVersion object is created on lookupCollection to avoid breaking causal consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56908&quot;&gt;&lt;del&gt;SERVER-56908&lt;/del&gt;&lt;/a&gt;: the &lt;tt&gt;CatalogCache&lt;/tt&gt; needs a way to create &lt;tt&gt;ComparableDatabaseVersion&lt;/tt&gt; placeholders (i.e. only have the values captured from the atomics) that will be filled later once it gets the results from the loader.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56908&quot; title=&quot;Changing at which time the ComparableChunkVersion object is created on lookupCollection to avoid breaking causal consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56908&quot;&gt;&lt;del&gt;SERVER-56908&lt;/del&gt;&lt;/a&gt; assumed that a &lt;tt&gt;ComparableDatabaseVersion&lt;/tt&gt; create with an empty-constructed &lt;tt&gt;DatabaseVersion&lt;/tt&gt; would be enough. However, in some situations these placeholders don&apos;t get a valid version (BF-21215, mainly when the namespace is not found) and in this case the execution violated one important invariant: each &lt;tt&gt;DatabaseVersion&lt;/tt&gt; has a valid &lt;tt&gt;uuid&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I evaluated other alternatives such as adding a method to check whether a &lt;tt&gt;DatabaseVersion&lt;/tt&gt; but concluded that the proposal above is the less bad.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1750420">SERVER-57146</key>
            <summary>Add a way to construct a ComparableDatabaseVersion without a valid DatabaseVersion</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                    </labels>
                <created>Sun, 23 May 2021 12:34:48 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:11 +0000</updated>
                            <resolved>Tue, 25 May 2021 09:43:00 +0000</resolved>
                                                    <fixVersion>5.0.0-rc1</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4108225" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 19:00:40 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3835527" author="xgen-internal-githook" created="Tue, 25 May 2021 09:53:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57146&quot; title=&quot;Add a way to construct a ComparableDatabaseVersion without a valid DatabaseVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57146&quot;&gt;&lt;del&gt;SERVER-57146&lt;/del&gt;&lt;/a&gt; Add a way to construct a ComparableDatabaseVersion without a valid DatabaseVersion&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1a6e08a61c138e7da0500c11de78d3489b7024d4)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a282ff7da6f00be606ff816c22e7321dd66e202&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a282ff7da6f00be606ff816c22e7321dd66e202&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3835287" author="JIRAUSER1256927" created="Tue, 25 May 2021 09:18:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;

{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}

&lt;p&gt;Message: SERVER-570146 Add a way to construct a ComparableDatabaseVersion without a valid DatabaseVersion&lt;br/&gt;
 Branch: master&lt;br/&gt;
 &lt;a href=&quot;https://github.com/mongodb/mongo/commit/1a6e08a61c138e7da0500c11de78d3489b7024d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1a6e08a61c138e7da0500c11de78d3489b7024d4&lt;/a&gt;&lt;/p&gt;</comment>
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