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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-30358] shardCollection should ask primary shard for collection UUID if in schema version 3.6</title>
                <link>https://jira.mongodb.org/browse/SERVER-30358</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;shardCollection should not be allowed to run in a mixed-FCV cluster, because it can result in the collection that is being sharded not having a UUID stored in config.collections on the config server:&lt;/p&gt;

&lt;p&gt;1) setFCV=&quot;3.6&quot; called against a mongos, which forwards _configsvrSetFCV to the config server&lt;br/&gt;
2) configsvrSetFCV finishes generating UUIDs for existing sharded collections&lt;br/&gt;
3) shardCollection is called&lt;br/&gt;
    --&amp;gt; the FCV on the config server has not been set to 3.6 yet, so shardCollection will not ask the primary shard for a UUID&lt;br/&gt;
    --&amp;gt; and even if it did ask, the primary shard may not have had setFCV called on it yet, and so would not return a UUID&lt;br/&gt;
    --&amp;gt; so an entry for the newly sharded collection will get written to config.collections without a UUID&lt;/p&gt;</description>
                <environment></environment>
        <key id="408801">SERVER-30358</key>
            <summary>shardCollection should ask primary shard for collection UUID if in schema version 3.6</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="3">Duplicate</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Jul 2017 20:53:08 +0000</created>
                <updated>Thu, 12 Oct 2017 16:14:23 +0000</updated>
                            <resolved>Thu, 5 Oct 2017 15:33:42 +0000</resolved>
                                    <version>3.5.10</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1690328" author="esha.maharishi@10gen.com" created="Thu, 5 Oct 2017 15:33:42 +0000"  >&lt;p&gt;Will be fixed as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30745&quot; title=&quot;Prohibit unsafe comparisons against feature compatibility version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30745&quot;&gt;&lt;del&gt;SERVER-30745&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1671333" author="esha.maharishi@10gen.com" created="Tue, 12 Sep 2017 22:17:32 +0000"  >&lt;p&gt;The linked ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31068&quot; title=&quot;make config server update fcv &amp;#39;targetVersion&amp;#39; at beginning of _configsvrSetFeatureCompatibilityCommand&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31068&quot;&gt;&lt;del&gt;SERVER-31068&lt;/del&gt;&lt;/a&gt; will prevent a 3.4 mongos from talking to the config server, which simplifies this considerably. Local locks can be used to prevent _configsvrSetFeatureCompatibilityVersion from running concurrently with the metadata commands mentioned.&lt;/p&gt;</comment>
                            <comment id="1632772" author="esha.maharishi@10gen.com" created="Wed, 26 Jul 2017 20:53:40 +0000"  >&lt;p&gt;Considered a &quot;minor&quot; backwards-breaking change, since movePrimary and shardCollection were previously allowed to run during upgrade.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="426805">SERVER-31068</issuekey>
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            <issuekey id="411154">SERVER-30459</issuekey>
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