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            <title>[SERVER-83880] Allow collection creation on the least loaded shard rather than the dbPrimary</title>
                <link>https://jira.mongodb.org/browse/SERVER-83880</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a data shard is not specified for a collection creation, the default is currently to choose the dbPrimary (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4e953b7b91aec9f94e8b90855dec0150ed16c910/src/mongo/db/s/create_collection_coordinator.cpp#L202&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sharded&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4e953b7b91aec9f94e8b90855dec0150ed16c910/src/mongo/db/s/create_collection_coordinator.cpp#L168-L174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unsharded&lt;/a&gt;). However, now that the balancer is moving unsharded collections and those collections can live outside the dbprimary, we can instead choose the least loaded shard by querying the balancer and use that as the data shard.&lt;/p&gt;

&lt;p&gt;We should still always choose the dbPrimary if unsharded collection balancing is disabled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2516484">SERVER-83880</key>
            <summary>Allow collection creation on the least loaded shard rather than the dbPrimary</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="allison.easton@mongodb.com">Allison Easton</reporter>
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                <created>Tue, 5 Dec 2023 10:53:39 +0000</created>
                <updated>Wed, 6 Dec 2023 01:01:11 +0000</updated>
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