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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-83840] Implicitly change all DBPrimaries on removeShard</title>
                <link>https://jira.mongodb.org/browse/SERVER-83840</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implicitly change all the DBPrimary from the removed shard on a removeShard operation.&lt;/p&gt;

&lt;p&gt;To do that we should call the &lt;tt&gt;_shardsvrDrainShard&lt;/tt&gt; command from the &lt;tt&gt;_configsvrRemoveShard&lt;/tt&gt; execution thread.&lt;/p&gt;

&lt;p&gt;Considerations to be taken:&#160;&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;We can&apos;t call _shardsvrDrainShard unless all the &lt;a href=&quot;https://github.com/10gen/mongo/blob/1b4bf39fd8479480983a2c9fe878b1d458782336/src/mongo/db/s/config/sharding_catalog_manager_shard_operations.cpp#L1108-L1150&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checks&lt;/a&gt; to remove a shard pass.&lt;/li&gt;
	&lt;li&gt;Config server will tell the draining shard through the &lt;tt&gt;_shardsvrDrainShard&lt;/tt&gt; command which is the destination shard for all the databases.&lt;/li&gt;
	&lt;li&gt;The balancer won&apos;t start moving the unsplittable collections related to the &lt;tt&gt;removeShard&lt;/tt&gt; operation until their database is been moved off the draining shard.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2515348">SERVER-83840</key>
            <summary>Implicitly change all DBPrimaries on removeShard</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="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                    </labels>
                <created>Mon, 4 Dec 2023 11:15:08 +0000</created>
                <updated>Tue, 5 Dec 2023 10:50:11 +0000</updated>
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