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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-10077] Shard tag limits</title>
                <link>https://jira.mongodb.org/browse/SERVER-10077</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I would like to understand what are the limits around shard tags and also the impact to performance. &lt;/p&gt;

&lt;p&gt;Is there any limit for the number of tags that can be added? How would it effect the perfomance of balancer if we have 6000+ tags&lt;/p&gt;

&lt;p&gt;Ranjan&lt;/p&gt;</description>
                <environment>AWS Linux AMI, using 2.4.4 mongo</environment>
        <key id="80965">SERVER-10077</key>
            <summary>Shard tag limits</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
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                        <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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ranjan@snapwiz.com">Ranjan Parthasarathy</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Jul 2013 04:14:03 +0000</created>
                <updated>Tue, 9 Jul 2013 04:52:56 +0000</updated>
                            <resolved>Tue, 9 Jul 2013 04:52:56 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="376854" author="stennie" created="Tue, 9 Jul 2013 04:52:37 +0000"  >&lt;p&gt;Hi Ranjan,&lt;/p&gt;

&lt;p&gt;The SERVER project is for reporting bugs or feature suggestions for the MongoDB server and tools.&lt;/p&gt;

&lt;p&gt;For MongoDB-related support discussion please post on the mongodb-users group (&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;http://groups.google.com/group/mongodb-user&lt;/a&gt;) or Stack Overflow.&lt;/p&gt;

&lt;p&gt;The normal mechanism for distributing data is &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/select-shard-key/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;choosing a good shard key&lt;/a&gt;.  Tag-aware sharding makes it possible to associate specific ranges of a shard key with a specific shard or subset of shards, but 6000+ tags sounds like a misuse of the feature.&lt;/p&gt;

&lt;p&gt;I would encourage you to read on up on the &lt;a href=&quot;http://docs.mongodb.org/manual/core/sharded-clusters/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Sharded Cluster&lt;/a&gt; documentation to get a better understanding of MongoDB&apos;s sharding architecture.&lt;/p&gt;

&lt;p&gt;For an example of tag-aware sharding, you might find this blog post helpful: &lt;a href=&quot;http://www.kchodorow.com/blog/2012/07/25/controlling-collection-distribution/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Controlling Collection Distribution&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Stephen&lt;/p&gt;</comment>
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