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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>[DOCS-3685] Primary shard of existing databases</title>
                <link>https://jira.mongodb.org/browse/DOCS-3685</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/core/sharded-cluster-shards/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/sharded-cluster-shards/&lt;/a&gt;&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;When you deploy a new sharded cluster, the &#8220;first&#8221; shard becomes the primary shard for all existing databases before enabling sharding. Databases created subsequently may reside on any shard in the cluster.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Let&apos;s say you have a server A with database &lt;tt&gt;foo&lt;/tt&gt; (and lots of data), and servers B and C which do not have the database &lt;tt&gt;foo&lt;/tt&gt;. You then set up a sharded cluster and addShards in this order: B, C, A. Once you enable sharding for &lt;tt&gt;foo&lt;/tt&gt;, the primary is server A, even though it&apos;s not the first shard.&lt;/p&gt;

&lt;p&gt;I tested this on 2.4.8, happy to do more testing if needed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="144758">DOCS-3685</key>
            <summary>Primary shard of existing databases</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="joanna.cheng@mongodb.com">Joanna Cheng</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Jul 2014 02:06:53 +0000</created>
                <updated>Wed, 4 Mar 2015 21:24:18 +0000</updated>
                            <resolved>Tue, 1 Jul 2014 12:58:03 +0000</resolved>
                                                    <fixVersion>v1.3.7</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="640439" author="xgen-internal-githook" created="Tue, 1 Jul 2014 12:58:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3685&quot; title=&quot;Primary shard of existing databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3685&quot;&gt;&lt;del&gt;DOCS-3685&lt;/del&gt;&lt;/a&gt;: clarify where existing database live on a new sharded cluster&lt;br/&gt;
Branch: v2.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/bbf1c8a114d67e35c0d5786b4a40d6e40392e039&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/bbf1c8a114d67e35c0d5786b4a40d6e40392e039&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="640438" author="xgen-internal-githook" created="Tue, 1 Jul 2014 12:56:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3685&quot; title=&quot;Primary shard of existing databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3685&quot;&gt;&lt;del&gt;DOCS-3685&lt;/del&gt;&lt;/a&gt;: clarify where existing database live on a new sharded cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f57c86cc60d3a5fdde380edd5442a4dbca8c205a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f57c86cc60d3a5fdde380edd5442a4dbca8c205a&lt;/a&gt;&lt;/p&gt;</comment>
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