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    <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-29653] Drop admin.system.keys on CSRS downgrade from 3.6 fcv to 3.4 fcv</title>
                <link>https://jira.mongodb.org/browse/SERVER-29653</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The admin.system.keys collection should be dropped on downgrade csrs to v3.4 (dependent on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29637&quot; title=&quot;make shards obtain UUID for sharded collections from config server on setFeatureCompatibilityVersion: 3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29637&quot;&gt;&lt;del&gt;SERVER-29637&lt;/del&gt;&lt;/a&gt;) &lt;/p&gt;

&lt;p&gt;Here is the scenario we want to prevent:&lt;br/&gt;
1. Upgrade csrs to v3.6.&lt;br/&gt;
2. Downgrade csrs to v3.4.&lt;br/&gt;
3. Either add a new node to csrs or maybe one of the secondaries became too stale and need to do initial sync.&lt;br/&gt;
4. One of the secondary will now claim to be &apos;replicated&apos; after the sync without copying the keys.&lt;br/&gt;
5. Upgrade csrs to v3.6. One of the secondary will not contain the existing keys even though it is supposed to be &apos;caught up&apos;.&lt;/p&gt;

&lt;p&gt;Note: this can be an issue because of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.5.7/src/mongo/db/repl/databases_cloner.cpp#L265&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;selective initial sync&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;A test should be added to verify this scenario does not happen.&lt;/p&gt;</description>
                <environment></environment>
        <key id="394393">SERVER-29653</key>
            <summary>Drop admin.system.keys on CSRS downgrade from 3.6 fcv to 3.4 fcv</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="misha.tyulenev@mongodb.com">Misha Tyulenev</reporter>
                        <labels>
                            <label>PM-221</label>
                    </labels>
                <created>Thu, 15 Jun 2017 16:29:06 +0000</created>
                <updated>Mon, 30 Oct 2023 23:16:02 +0000</updated>
                            <resolved>Tue, 7 Nov 2017 14:33:54 +0000</resolved>
                                                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1719215" author="xgen-internal-githook" created="Tue, 7 Nov 2017 14:33:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-29653&quot; title=&quot;Drop admin.system.keys on CSRS downgrade from 3.6 fcv to 3.4 fcv&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-29653&quot;&gt;&lt;del&gt;SERVER-29653&lt;/del&gt;&lt;/a&gt; Drop admin.system.keys on CSRS downgrade from 3.6 fcv to 3.4 fcv&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/82448e638f736c505cf5caccbbefe058cddcf15f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/82448e638f736c505cf5caccbbefe058cddcf15f&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="394011">SERVER-29637</issuekey>
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