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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-12951] Investigate changes in SERVER-42368: Remove max shard key value size limit</title>
                <link>https://jira.mongodb.org/browse/DOCS-12951</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;


&lt;h3&gt;&lt;a name=&quot;ChangeDescription%3A&quot;&gt;&lt;/a&gt;Change Description: &lt;/h3&gt;

&lt;p&gt;Shard key value size limit is documented at &lt;a href=&quot;https://docs.mongodb.com/manual/reference/limits/#Shard-Key-Size&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/limits/#Shard-Key-Size&lt;/a&gt; (and possibly elsewhere), which will need to be updated.  This change should also be mentioned in the release notes.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;SERVERticketdescription%3A&quot;&gt;&lt;/a&gt;SERVER ticket description: &lt;/h3&gt;

&lt;p&gt;Shard key values have a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b94251e25f11342530265e0ff0c7b8b91122a9c1/src/mongo/s/shard_key_pattern.h#L70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;max size limit of 512 bytes&lt;/a&gt; which is enforced on mongos when writing new documents (e.g. &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b94251e25f11342530265e0ff0c7b8b91122a9c1/src/mongo/s/write_ops/chunk_manager_targeter.cpp#L400&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;for inserts&lt;/a&gt;) and when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b94251e25f11342530265e0ff0c7b8b91122a9c1/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L405&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;validating the split points when committing a chunk split&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Because of this, if a user refined the shard key of their collection to include a field all documents have large values for, they would be unable split their chunks because all possible split points would be over the limit. To avoid this scenario without scanning the documents in a collection before refining the collection&apos;s shard key and now that that limit on index keys has been lifted (PM-284), this limit should be removed.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="890758">DOCS-12951</key>
            <summary>Investigate changes in SERVER-42368: Remove max shard key value size limit</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Aug 2019 01:24:03 +0000</created>
                <updated>Mon, 13 Nov 2023 18:17:38 +0000</updated>
                            <resolved>Wed, 18 Mar 2020 14:22:15 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>Server</component>
                        <due>Fri, 20 Mar 2020 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2984973" author="xgen-internal-githook" created="Wed, 18 Mar 2020 14:22:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12951&quot; title=&quot;Investigate changes in SERVER-42368: Remove max shard key value size limit&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12951&quot;&gt;&lt;del&gt;DOCS-12951&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13127&quot; title=&quot;Investigate changes in SERVER-42299: Upgrade/downgrade for config.chunks and config.tags&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13127&quot;&gt;&lt;del&gt;DOCS-13127&lt;/del&gt;&lt;/a&gt;: 4.4 shard key value size, fcv upgrade/downgrade for shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/580eb74530dac39751841a0699da999426320616&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/580eb74530dac39751841a0699da999426320616&lt;/a&gt;&lt;/p&gt;</comment>
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