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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-4043] moveChunk: additional limit for documents / chunk for the same shard key</title>
                <link>https://jira.mongodb.org/browse/DOCS-4043</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The current limits page at &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; does not contain the upper limit on the document count that can be part of the chunk for moveChunk to happen.&lt;/p&gt;

&lt;p&gt;Based on the following code base, this looks to be 250,000 and should be reflected in the limits:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/chunk.cpp#L82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/s/chunk.cpp#L82&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/s/d_migrate.cpp#L463-L501&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/s/d_migrate.cpp#L463-L501&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;



&lt;p&gt;This is mainly an issue when the user has small documents (sometimes along with low cardinality shard key) and the number of documents with same shard key exceed this limit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="158306">DOCS-4043</key>
            <summary>moveChunk: additional limit for documents / chunk for the same shard key</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="anil.kumar">Anil Kumar</reporter>
                        <labels>
                    </labels>
                <created>Mon, 15 Sep 2014 22:07:10 +0000</created>
                <updated>Mon, 13 Oct 2014 20:05:44 +0000</updated>
                            <resolved>Mon, 13 Oct 2014 20:05:35 +0000</resolved>
                                                    <fixVersion>v1.3.12</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="740075" author="xgen-internal-githook" created="Mon, 13 Oct 2014 20:04:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kay-kim&apos;, u&apos;name&apos;: u&apos;kay&apos;, u&apos;email&apos;: u&apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-4043&quot; title=&quot;moveChunk: additional limit for documents / chunk for the same shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-4043&quot;&gt;&lt;del&gt;DOCS-4043&lt;/del&gt;&lt;/a&gt; max docs in chunk to move&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/9b2851b6a1553a94e1ad24f35b64c049623c4c03&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/9b2851b6a1553a94e1ad24f35b64c049623c4c03&lt;/a&gt;&lt;/p&gt;</comment>
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