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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>[DOCS-4204] Comment on: &quot;manual/tutorial/choose-a-shard-key.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-4204</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Thanks for the great documentation.&lt;br/&gt;
We believe it&apos;s missing a very important fact about large chunks, which could be cause by incorrect selection of a shard key. Unsplittable large chunks will not be moved by the balancer. Thus, making them static to the shard they&apos;ve been created on and never be able to move them, in case there&apos;s a need for it.&lt;br/&gt;
In &quot;Scaling MongoDB&quot; Kristina Chodorow writes &quot;If a chunk gets too big, MongoDB will refuse to move it&quot;. This comment is spot on and should be in the official documentation as it affects the shard key decision.&lt;/p&gt;
</description>
                <environment>&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/choose-a-shard-key/#sharding-shard-key-cardinality&quot;&gt;http://docs.mongodb.org/manual/tutorial/choose-a-shard-key/#sharding-shard-key-cardinality&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.124 Safari/537.36&lt;br/&gt;
*Referrer*: &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/choose-a-shard-key/&quot;&gt;http://docs.mongodb.org/manual/tutorial/choose-a-shard-key/&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1440 x 900&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: tutorial/choose-a-shard-key&lt;br/&gt;
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        <key id="164123">DOCS-4204</key>
            <summary>Comment on: &quot;manual/tutorial/choose-a-shard-key.txt&quot;</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="rboyarski@infomedia.com.au">Ruby Boyarski</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Fri, 17 Oct 2014 06:35:35 +0000</created>
                <updated>Wed, 14 Dec 2016 16:20:36 +0000</updated>
                            <resolved>Fri, 17 Oct 2014 16:11:14 +0000</resolved>
                                                    <fixVersion>v1.3.12</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="744122" author="xgen-internal-githook" created="Fri, 17 Oct 2014 14:47:00 +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-4204&quot; title=&quot;Comment on: &amp;quot;manual/tutorial/choose-a-shard-key.txt&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4204&quot;&gt;&lt;del&gt;DOCS-4204&lt;/del&gt;&lt;/a&gt;: adding a note about cardinality and large chunks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/63c61a8639485f87b5f4c30fc3a16108b985cecb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/63c61a8639485f87b5f4c30fc3a16108b985cecb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="743929" author="gianfranco" created="Fri, 17 Oct 2014 08:35:42 +0000"  >&lt;p&gt;Hi Ruby,&lt;/p&gt;

&lt;p&gt;Thanks for reporting this.&lt;br/&gt;
You&apos;re right this fact is not mentioned in this page.&lt;/p&gt;

&lt;p&gt;While we do have it &lt;a href=&quot;http://docs.mongodb.org/manual/core/sharding-chunk-migration/#jumbo-chunks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; it&apos;s true that if you choose a shard key that does not have high cardinality some chunks could get too big to be moved.&lt;/p&gt;

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