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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-30572] Support configurable &apos;jumbo&apos; chunk threshold</title>
                <link>https://jira.mongodb.org/browse/SERVER-30572</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently if a chunk spans over more than &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.7/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;250,000 documents&lt;/a&gt; it will be considered &apos;jumbo&apos; and the balancer will refuse to move it until it is split into smaller chunks. In the case of bad shard key selection where the key cardinality is too high, jumbo chunks may arise which cannot be split because the entire chunk consists of the same shard key value.&lt;/p&gt;

&lt;p&gt;The hardcoded 250,000 documents limit was included as a precaution against such large chunks taking too long to migrate and causing the donor shard to run out of memory because of &lt;a href=&quot;https://github.com/mongodb/mongo/wiki/Sharding-Internals#migration-protocol-summary&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;accumulation of &apos;mods&apos;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In order to allow users in emergency situations to move jumbo chunks out of shards we should allow this limit to be temporarily increased. If we do this, we should also put a cap on the size of accumulated in-memory mods.&lt;/p&gt;</description>
                <environment></environment>
        <key id="414401">SERVER-30572</key>
            <summary>Support configurable &apos;jumbo&apos; chunk threshold</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Wed, 9 Aug 2017 12:00:13 +0000</created>
                <updated>Mon, 29 Jan 2018 18:34:07 +0000</updated>
                            <resolved>Wed, 8 Nov 2017 19:46:20 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1668283" author="renctan" created="Fri, 8 Sep 2017 18:18:30 +0000"  >&lt;p&gt;Note: this will no longer be needed if we get rid of the limit completely in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19919&quot; title=&quot;Chunks that exceed 250000 docs but are under half chunk size get marked as jumbo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19919&quot;&gt;&lt;del&gt;SERVER-19919&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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