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<item>
            <title>[SERVER-14512] How to fix bad shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-14512</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;I have a problem with one of our shards. For some reason I&apos;m getting the next usage&lt;/p&gt;

&lt;p&gt;15:38:42 up 4 days, 10:28,  1 user,  load average: 3.67, 3.50, 3.56&lt;br/&gt;
In the mean time all other shards are ok. Their average load approx:&lt;/p&gt;

&lt;p&gt;16:49:58 up 11 days, 56 min,  1 user,  load average: 0.03, 0.03, 0.05&lt;br/&gt;
I have 3config, 2 query and 7 shards (all of them are primary replicaset. don&apos;t ask why). I have 2 databases: 20Gb and 30gb. All servers are the same in their configuration. Also, in each database only 1 collection.&lt;br/&gt;
The problem with inapropritae shard key.&lt;br/&gt;
Please let me know what will be better: &lt;/p&gt;

&lt;p&gt;a) make backups of current 2 databases, destroy them via mongos shell, create new databases with correct shard keys and upload our dumps&lt;br/&gt;
b) follow with suggestion on StackExchange from on of your staff and Unshard collection?&lt;/p&gt;

&lt;p&gt;Our cluster is working as a test environment.&lt;br/&gt;
Thank you.&lt;/p&gt;</description>
                <environment>All servers are running on OS Ubuntu 12.04, 16Gb RAM, 500Gb HDD, Intel Xeon CPU on each server</environment>
        <key id="146279">SERVER-14512</key>
            <summary>How to fix bad shard key</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="eric.bechtel@webjet.com">Eric Bechtel</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Jul 2014 18:16:00 +0000</created>
                <updated>Wed, 10 Dec 2014 23:19:37 +0000</updated>
                            <resolved>Wed, 9 Jul 2014 21:05:15 +0000</resolved>
                                    <version>2.6.3</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="653665" author="ramon.fernandez" created="Wed, 9 Jul 2014 21:05:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=eric.bechtel%40webjet.com&quot; class=&quot;user-hover&quot; rel=&quot;eric.bechtel@webjet.com&quot;&gt;eric.bechtel@webjet.com&lt;/a&gt;, since this a test environment I&apos;d do a backup+restore cycle (your first option).&lt;/p&gt;

&lt;p&gt;Note that the SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-users group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. For general questions like this one your best option is to post it on the mongodb-users group.&lt;/p&gt;</comment>
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