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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-13990] Improved warning for low cardinality keys</title>
                <link>https://jira.mongodb.org/browse/SERVER-13990</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongo estimates the &quot;max&quot; reasonable chunk size and warns if that chunk size exceeds that, in a effort to detect low cardinality keys.  The error message is:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Sat May 17 16:10:09.335 [conn164120] warning: chunk is larger than 1024 bytes because of key { field1: &quot;value1&quot;, field2: value2 }&lt;/span&gt;&lt;/pre&gt;
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&lt;p&gt;A more informative error message like: &quot;warning possible low cardinality for shard key detected &amp;lt;database&amp;gt;.&amp;lt;collection&amp;gt;&quot; would be helpful.&lt;/p&gt;</description>
                <environment></environment>
        <key id="137152">SERVER-13990</key>
            <summary>Improved warning for low cardinality keys</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="david.hows">David Hows</assignee>
                                    <reporter username="charlie.page@10gen.com">Charlie Page</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 May 2014 15:20:45 +0000</created>
                <updated>Sat, 19 Sep 2015 00:04:07 +0000</updated>
                            <resolved>Thu, 4 Jun 2015 00:16:27 +0000</resolved>
                                                    <fixVersion>3.1.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>1</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="930222" author="xgen-internal-githook" created="Wed, 3 Jun 2015 08:46:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;daveh86&apos;, u&apos;name&apos;: u&apos;daveh86&apos;, u&apos;email&apos;: u&apos;howsdav@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13990&quot; title=&quot;Improved warning for low cardinality keys&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13990&quot;&gt;&lt;del&gt;SERVER-13990&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1c4270f508a12eb8aed1fbaf1228cd53c7a357cd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1c4270f508a12eb8aed1fbaf1228cd53c7a357cd&lt;/a&gt;&lt;/p&gt;</comment>
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