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    <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-12978] Improve nuance around Jumbo chunks</title>
                <link>https://jira.mongodb.org/browse/DOCS-12978</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;p&gt;The docs could be clearer when handling the phrase &quot;jumbo chunks&quot;.  This is used interchangably to refer to each of:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;chunk that has been marked with the &lt;tt&gt;jumbo: true&lt;/tt&gt; flag&lt;/li&gt;
	&lt;li&gt;chunk that is indivisible, and will be marked as &lt;tt&gt;jumbo: true&lt;/tt&gt; if the balancer attempts to move it (but currently doesn&apos;t have &lt;tt&gt;jumbo: true&lt;/tt&gt;)&lt;/li&gt;
	&lt;li&gt;chunk that is divisible, but has been marked as &lt;tt&gt;jumbo: true&lt;/tt&gt; for some other reason (eg. &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;a href=&quot;https://jira.mongodb.org/browse/SERVER-21931&quot; title=&quot;Only mark chunks as jumbo if split fails because the chunk is too large&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21931&quot;&gt;&lt;del&gt;SERVER-21931&lt;/del&gt;&lt;/a&gt;).&lt;/li&gt;
	&lt;li&gt;chunk that is informally very large and difficult to migrate or work with (but may in fact be divisible)&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I&apos;m not sure if #3 and #4 are actually a problem in the docs &amp;#8212; it might be more in discussions elsewhere about jumbo chunks.&lt;/p&gt;

&lt;p&gt;In any case, the docs would benefit from some discussion around &quot;jumbo as in &lt;tt&gt;jumbo: true&lt;/tt&gt;&quot; vs &quot;jumbo as in indivisible and large&quot;.&lt;/p&gt;

&lt;p&gt;Examples:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-data-partitioning/#jumbo-chunks&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/sharding-data-partitioning/#jumbo-chunks&lt;/a&gt; says &quot;In some cases, chunks can grow beyond the specified chunk size but cannot undergo a split. The most common scenario is when a chunk represents a single shard key value. Since the chunk cannot split, it continues to grow beyond the chunk size, becoming a jumbo chunk.&quot;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-data-partitioning/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/sharding-data-partitioning/index.html&lt;/a&gt; says &quot;Automatic splitting only occurs during inserts or updates.&quot; and &quot;Inserts and updates may trigger splits.&quot; and later on that the balancer just just moves the chunks around that were split during insert or update to regain an even distribution amongst the shards.&lt;/li&gt;
&lt;/ul&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="903529">DOCS-12978</key>
            <summary>Improve nuance around Jumbo chunks</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                            <label>docs-onboarding-candidate</label>
                    </labels>
                <created>Thu, 22 Aug 2019 05:56:12 +0000</created>
                <updated>Mon, 30 Oct 2023 20:35:51 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940434" author="edu.bot" created="Mon, 31 Oct 2022 16:05:24 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                    </comments>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="769583">DOCS-12704</issuekey>
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            <issuelink>
            <issuekey id="747249">SERVER-40881</issuekey>
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