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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4271] Shard key (512 bytes) maximum is less than Index key (1024 bytes) maximum</title>
                <link>https://jira.mongodb.org/browse/SERVER-4271</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently the shard key maximum (512 bytes) is less than the index key maximum (1024 bytes) hence an error is thrown when you attempt to shard on an index key that is greater than 512 bytes.  Consequently it may become impossible to shard on the most appropriate index key for your application if the size is above the 512 byte maximum of the shard key.&lt;/p&gt;

&lt;p&gt;Error returned is &quot;Shard Key must be less than 512 bytes&quot;.&lt;/p&gt;

&lt;p&gt;Increasing the shard key maximum to 1024 bytes would solve this problem.&lt;/p&gt;</description>
                <environment></environment>
        <key id="24871">SERVER-4271</key>
            <summary>Shard key (512 bytes) maximum is less than Index key (1024 bytes) maximum</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="daniel.roberts@10gen.com">daniel.roberts@10gen.com</reporter>
                        <labels>
                            <label>sharding</label>
                    </labels>
                <created>Mon, 14 Nov 2011 14:00:40 +0000</created>
                <updated>Tue, 6 Dec 2022 05:39:26 +0000</updated>
                            <resolved>Fri, 30 Jul 2021 17:18:58 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>4</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="254389" author="cacsar" created="Thu, 31 Jan 2013 03:57:25 +0000"  >&lt;p&gt;It&apos;d be really great if this could be mentioned in &lt;em&gt;any&lt;/em&gt; the documentation such as &lt;a href=&quot;http://docs.mongodb.org/manual/reference/limits/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/limits/&lt;/a&gt; &lt;a href=&quot;http://docs.mongodb.org/manual/faq/sharding&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/sharding&lt;/a&gt; &lt;a href=&quot;http://docs.mongodb.org/manual/core/sharded-cluster-internals/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/sharded-cluster-internals/&lt;/a&gt; , or really anywhere sensible. It&apos;s quite a useful consideration to be aware of given when designing things particularly given that _id is the only option for a shard key for a collection that is being used for the output of map reduce.&lt;/p&gt;</comment>
                            <comment id="82915" author="redbeard0531" created="Fri, 27 Jan 2012 19:30:30 +0000"  >&lt;p&gt;There are some good reasons to limit the shard key size. One is that the _id of chunks is currently a stringified form of ns and shard key value. Also since the shard keys are kept in memory on every mongos (many times in some cases) it is a very good idea to pick a small key. If the natural shard key is too large, such as urls, it might make sense to use an md5/sha1 of the key rather than the key itself.&lt;/p&gt;</comment>
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            <issuekey id="32794">SERVER-5290</issuekey>
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