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    <title>MongoDB Jira</title>
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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-10258] Allow previously removed shards to be added again</title>
                <link>https://jira.mongodb.org/browse/SERVER-10258</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it is not possible to invoke a removeShard command on a specific machine and add it again at a later time without removing the datafiles due to the following error :&lt;/p&gt;

&lt;p&gt;&quot;errmsg&quot; : &quot;can&apos;t add shard localhost:27022 because a local database &apos;test&apos; exists in another shard0000:localhost:27021&quot;&lt;/p&gt;

&lt;p&gt;I understand mongo cannot simply remove the database from the removed shard for a variety of reasons but I think the validation step to determine if the shard to be added is &quot;clean&quot; can be improved. I would assume iterating over all partitioned = true database on the new shard and for each iterating on all sharded collections to check if they&apos;re empty should be as safe a check and would allow subsequent removeShard-&amp;gt;addShard without further intervention.&lt;/p&gt;</description>
                <environment></environment>
        <key id="82851">SERVER-10258</key>
            <summary>Allow previously removed shards to be added again</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-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="remonvv">Remon van Vliet</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Fri, 19 Jul 2013 11:13:18 +0000</created>
                <updated>Thu, 26 Oct 2023 09:59:04 +0000</updated>
                                            <version>2.4.5</version>
                                                                        <votes>2</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1699227" author="kevin.rice@searshc.com" created="Sun, 15 Oct 2017 16:15:16 +0000"  >&lt;p&gt;In order to resolve a hot-shard issue, I have done a removeShard() to completion.  Now, I want to add that shard back.  But, instead, I get the complaint that:&lt;/p&gt;

&lt;p&gt;mongos&amp;gt; sh.addShard(&quot;shard01/&amp;lt;myhostname_here_01&amp;gt;:&amp;lt;portnum_01&amp;gt;&quot;);&lt;/p&gt;
{
        &quot;code&quot; : 96,
        &quot;ok&quot; : 0,
        &quot;errmsg&quot; : &quot;can&apos;t add shard &apos;shard01/&amp;lt;myhostname_here_01&amp;gt;:&amp;lt;portnum_01&amp;gt;&apos; because a local database &apos;megamaid&apos; exists in another shard04&quot;
}

&lt;p&gt;This is UNHELPFUL, I don&apos;t have instructions on how to proceed here.  How do I get back to being able to add this shard back in?&lt;/p&gt;</comment>
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