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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-84161] Reshard Collection to the Same Shard Efficiency Improvement</title>
                <link>https://jira.mongodb.org/browse/SERVER-84161</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Resharding a collection that is only located on one shard and has one chunk and is being resharded to only that shard (meaning the only shard it currently exists on) should be efficient as no data movement is required. We only have to do index creation (if the new shard key is not _id) and the metadata change commit.&lt;/p&gt;

&lt;p&gt;This will also be an optimization for unsharding a collection that only exists on one shard already as well.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2524264">SERVER-84161</key>
            <summary>Reshard Collection to the Same Shard Efficiency Improvement</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="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-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="matt.panton@mongodb.com">Matt Panton</reporter>
                        <labels>
                            <label>cs-subteam1</label>
                            <label>tech-debt</label>
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                <created>Wed, 13 Dec 2023 21:21:50 +0000</created>
                <updated>Mon, 18 Dec 2023 20:39:28 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5949365" author="JIRAUSER1253399" created="Wed, 13 Dec 2023 21:33:00 +0000"  >&lt;p&gt;I wonder if we should solve this generally for resharding rather than just unshardCollection specific where if the existing collection is on one shard, with one chunk and the same shard is guaranteed to own all the data post-resharding, we just do index creation (which can be skipped if the new shard key is _id) and a metadata change commit.&lt;/p&gt;</comment>
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