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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-10967] Adding shard fails due to $CLUSTER database</title>
                <link>https://jira.mongodb.org/browse/SERVER-10967</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Looks like the 2.4.1 servers have a database called &quot;$CLUSTER&quot;. When I add a replica set to a shard it fails because a previously added replica set has a &quot;$CLUSTER&quot; db too. Can I go ahead and delete this db to add a second shard?&lt;/p&gt;</description>
                <environment>Amazon AWS, 2.4.1</environment>
        <key id="92142">SERVER-10967</key>
            <summary>Adding shard fails due to $CLUSTER database</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="kyle.erf">Kyle Erf</assignee>
                                    <reporter username="dharshanr@scalegrid.net">Dharshan Rangegowda</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Sep 2013 20:16:25 +0000</created>
                <updated>Wed, 20 Nov 2013 16:51:24 +0000</updated>
                            <resolved>Thu, 7 Nov 2013 21:13:58 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="451239" author="spencer" created="Mon, 4 Nov 2013 22:06:46 +0000"  >&lt;p&gt;This is a known issue in 2.4.1 (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-9111&quot; title=&quot;$CLUSTER &amp;amp; $SERVER databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-9111&quot;&gt;&lt;del&gt;SERVER-9111&lt;/del&gt;&lt;/a&gt;) that was fixed in later version of the 2.4.x series.  I highly recommend upgrading to 2.4.8 which should fix this problem.&lt;/p&gt;

&lt;p&gt;Dropping the &quot;$CLUSTER&quot; database is safe, and doing so on all shards &lt;b&gt;may&lt;/b&gt; (I suspect it will but I haven&apos;t tested) workaround the problem temporarily, allowing you to add the shard until you can do the full upgrade to 2.4.8.&lt;/p&gt;</comment>
                            <comment id="451234" author="dharshanr@scalegrid.net" created="Mon, 4 Nov 2013 22:01:21 +0000"  >&lt;p&gt;I don&apos;t remember the exact error message but you get it on the second shard because the first shard also has the $Cluster database. Hope that helps.&lt;/p&gt;</comment>
                            <comment id="451231" author="kyle.erf" created="Mon, 4 Nov 2013 21:57:38 +0000"  >&lt;p&gt;Thanks for the description. Do you remember what error you were getting when you were unable to add the shard?&lt;/p&gt;</comment>
                            <comment id="451215" author="dharshanr@scalegrid.net" created="Mon, 4 Nov 2013 21:49:04 +0000"  >&lt;p&gt;Hi Kyle,&lt;/p&gt;

&lt;p&gt;Its a fairly simple installation. I just setup a MongoDB shared cluster with 2 shards. Each shard is a 2+1 replica set. I also have 3 config servers and 3 shard routers. I just deleted the $cluster database and proceeded to add the replica set as a shard. For mongo install I used the 2.4.1 RPM package on CentOS.&lt;/p&gt;</comment>
                            <comment id="450956" author="kyle.erf" created="Mon, 4 Nov 2013 16:58:52 +0000"  >&lt;p&gt;Hi Dharshan, sorry for the delayed response to this issue. The solution to your problem is probably not deleting $CLUSTER, which is not an actual database (if you upgrade to a more recent release, in fact, $CLUSTER shouldn&apos;t be visible to you).&lt;/p&gt;

&lt;p&gt;So that I can better diagnose your problem, could you (1) please describe the layout of your mongodb cluster and (2) please post the exact error messages you are getting?&lt;/p&gt;</comment>
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