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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>[SERVER-55028] Improve the auto-splitter policy</title>
                <link>https://jira.mongodb.org/browse/SERVER-55028</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The chunk splitter is currently relying on the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f30dbae001e83286c6aa18d566d1628d335b9d74/src/mongo/db/s/chunk_splitter.cpp#L339-L347&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;splitVector&lt;/a&gt; function that can easily suggest to always split at a chunk at &lt;tt&gt;(maxChunkSize / 2)&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;While the &lt;a href=&quot;https://docs.mongodb.com/manual/core/sharding-data-partitioning/index.html#chunk-splits&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;documentation&lt;/a&gt; states that a chunk gets partitioned when it reaches the maximum chunk size, the current implementation can force a split simply if the current size is &lt;tt&gt;(maxChunkSize / 2 + &#949;)&lt;/tt&gt;. This results in the max chunk size being actually &lt;tt&gt;(maxChunkSize / 2)&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Not only that, some corner cases can produce very large chunk counts relative to document count.&lt;/p&gt;

&lt;p&gt;This ticket has two objectives to make the auto-splitter less aggressive:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;As a precondition for splitting, wait for a chunk size to get closer to the maximum&lt;/li&gt;
	&lt;li&gt;Consider making bigger chunks, with a size closer to the &lt;tt&gt;maxChunkSize&lt;/tt&gt; set by the user rather than half of it&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1643019">SERVER-55028</key>
            <summary>Improve the auto-splitter policy</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>PM-2321-Chunk-Splitter</label>
                    </labels>
                <created>Mon, 8 Mar 2021 08:50:51 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:35 +0000</updated>
                            <resolved>Thu, 2 Sep 2021 09:17:58 +0000</resolved>
                                                    <fixVersion>5.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4107870" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:50:05 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="4035809" author="xgen-internal-githook" created="Thu, 2 Sep 2021 08:58:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55028&quot; title=&quot;Improve the auto-splitter policy&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55028&quot;&gt;&lt;del&gt;SERVER-55028&lt;/del&gt;&lt;/a&gt; Improve the auto-splitter policy&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e97122db1397fbf7f6b520de27445ba3e5a5b156&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e97122db1397fbf7f6b520de27445ba3e5a5b156&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3695745" author="kaloian.manassiev" created="Thu, 1 Apr 2021 09:59:39 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli&quot;&gt;pierlauro.sciarelli&lt;/a&gt; to rewrite the description.&lt;/p&gt;</comment>
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            <issuekey id="1823556">SERVER-58650</issuekey>
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            <issuekey id="1823868">SERVER-58664</issuekey>
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            <issuekey id="1875962">SERVER-60009</issuekey>
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