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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-32992] Report an error when using MongoDB 4.0 binaries with a instance containing V2Unique format index.</title>
                <link>https://jira.mongodb.org/browse/SERVER-32992</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Starting MongoDB 4.0 binaries with an instance containing V2Unique format index should be reported as an error.  Report a warning message on startup and an error message the first time a V2Unique index is used, to allow users to remove these using a MongoDB 4.0 binary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="489305">SERVER-32992</key>
            <summary>Report an error when using MongoDB 4.0 binaries with a instance containing V2Unique format index.</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="neha.khatri">Neha Khatri</reporter>
                        <labels>
                            <label>nonnyc</label>
                            <label>storage-engines</label>
                    </labels>
                <created>Tue, 30 Jan 2018 03:41:24 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:59 +0000</updated>
                            <resolved>Thu, 2 Aug 2018 12:59:34 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1963836" author="milkie" created="Thu, 2 Aug 2018 12:59:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32994&quot; title=&quot;Create a script to rebuild unique indexes in right format after a downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32994&quot;&gt;&lt;del&gt;SERVER-32994&lt;/del&gt;&lt;/a&gt; is taking care of the documentation changes for this.  There was no commit necessary to achieve the goal of this ticket so I&apos;m closing it Works as Designed.&lt;/p&gt;</comment>
                            <comment id="1962343" author="neha.khatri" created="Wed, 1 Aug 2018 02:58:13 +0000"  >&lt;p&gt;MongoDB4.0 binary invokes the function&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/54f1582fc6eb01de4d4c42f26fc133e623f065fb/src/mongo/db/repair_database_and_check_version.cpp#L366&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ensureAllCollectionsHaveUUIDs&lt;/a&gt;&#160;on startup. The effect of calling this function at the start-up is that it opens all the databases, instantiating all the collections and indexes in the system. Instantiating a new format unique index validitates the index formatVersion. The formatVersion validation would fail with 4.0 binary and result in a FATAL assertion causing the startup failure.&lt;/p&gt;

&lt;p&gt;This is the desired behaviour with 4.0 binary at startup with new format unique index. Since all the indexes are accessed at startup, a warning at the startup looks unnecessary.&lt;/p&gt;</comment>
                            <comment id="1884260" author="alexander.gorrod" created="Mon, 7 May 2018 02:30:59 +0000"  >&lt;p&gt;Guess is 3 days work&lt;/p&gt;</comment>
                            <comment id="1804801" author="alexander.gorrod" created="Tue, 13 Feb 2018 20:23:21 +0000"  >&lt;p&gt;It makes sense to hold off doing this work until the V2Unique index format is enabled in 4.2&lt;/p&gt;</comment>
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