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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21179] Clean-up orphan chunk entries left from a failed shardCollection with initial split</title>
                <link>https://jira.mongodb.org/browse/SERVER-21179</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a shardCollection command with initial chunk split fails, it will leave orphaned chunk entries, which will then prevent the shardCollection call from being retried.&lt;/p&gt;

&lt;p&gt;Instead, if during a shardCollection call we discover that the collection is not marked as sharded, but there are existing chunks for it, these chunks should be cleaned up so the call can be retried.&lt;/p&gt;</description>
                <environment></environment>
        <key id="236554">SERVER-21179</key>
            <summary>Clean-up orphan chunk entries left from a failed shardCollection with initial split</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="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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 28 Oct 2015 14:08:24 +0000</created>
                <updated>Tue, 6 Dec 2022 04:41:05 +0000</updated>
                            <resolved>Thu, 3 May 2018 19:29:32 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1073677" author="kevin.pulo@10gen.com" created="Thu, 29 Oct 2015 02:47:59 +0000"  >&lt;p&gt;I find the idea of clearing any existing chunks at shardCollection time to be scary.  I&apos;m concerned about users who may have lost a config.collections entry (a bad situation, but relatively easy to recover from) getting confused and accidentally re-running shardCollection, which then removes all the chunk documents, meaning they&apos;ve lost all record of where their data is (disastrous and almost impossible to recover from).&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18787&quot; title=&quot;printShardingStatus/sh.status should warn when &amp;quot;foreign&amp;quot; chunks are found&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18787&quot;&gt;&lt;del&gt;SERVER-18787&lt;/del&gt;&lt;/a&gt; means that users (currently) have very little visibility into any foreign/orphan/stray chunk documents.&lt;/p&gt;

&lt;p&gt;Please can this be kept to only &lt;b&gt;cleaning up stray chunks after failed shardCollection calls&lt;/b&gt; (which is the real problem here), and the existing behaviour of shardCollection discovering pre-existing chunks be left as an error?&lt;/p&gt;</comment>
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