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    <title>MongoDB Jira</title>
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    <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-86015] ShardCollection should not create chunks on a draining shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-86015</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65666&quot; title=&quot;Do not create chunks on draining shards when sharding a new collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65666&quot;&gt;&lt;del&gt;SERVER-65666&lt;/del&gt;&lt;/a&gt; addressed this problem by making it so that the initial split policy will not choose draining shards when creating initial chunks. However, the create collection coordinator &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9340b95d51a109958ca6ab83c2fa6dc946022067/src/mongo/db/s/create_collection_coordinator.cpp#L1303-L1304&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;creates the initial chunks&lt;/a&gt; before actually &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9340b95d51a109958ca6ab83c2fa6dc946022067/src/mongo/db/s/create_collection_coordinator.cpp#L1334-L1342&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;committing them on the config server&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;This means that there is still a case in which shardCollection will create chunks on a draining shard if removeShard is called after the initial chunks are created.&lt;/p&gt;

&lt;p&gt;As part of this ticket, we should investigate whether this is additionally a problem with resharding. Resharding using the initial split policies to choose the new chunks for the collection, so it is possible that there is a similar problem here if &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9340b95d51a109958ca6ab83c2fa6dc946022067/src/mongo/db/s/resharding/resharding_coordinator_service.cpp#L1238-L1286&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the initial chunks are created&lt;/a&gt; and then a shard is removed before &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9340b95d51a109958ca6ab83c2fa6dc946022067/src/mongo/db/s/resharding/resharding_coordinator_service.cpp#L2284-L2290&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;persisting those chunks&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2562468">SERVER-86015</key>
            <summary>ShardCollection should not create chunks on a draining shard</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</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>
                        <labels>
                    </labels>
                <created>Wed, 31 Jan 2024 12:28:53 +0000</created>
                <updated>Thu, 1 Feb 2024 11:00:18 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="2025534">SERVER-65666</issuekey>
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                <attachments>
                            <attachment id="508278" name="remove_shard_shard_collection_repro.diff" size="6228" author="allison.easton@mongodb.com" created="Wed, 31 Jan 2024 12:29:09 +0000"/>
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