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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-55287] Make autosplitter behavior consistent with v4.2</title>
                <link>https://jira.mongodb.org/browse/SERVER-55287</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14052&quot; title=&quot;With only 2 distinct key values SplitVector Returns numSplits : 1 but no split is done&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14052&quot;&gt;&lt;del&gt;SERVER-14052&lt;/del&gt;&lt;/a&gt; introduced &lt;a href=&quot;https://github.com/mongodb/mongo/commit/c92e20479618b22355b9fb7efa935ff6db5883a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;some changes&lt;/a&gt; that have solved a bug for splitting chunks containing just 2 distinct values, but at the same time potentially increased the number of chunk splits happening.&lt;/p&gt;

&lt;p&gt;As per &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8bca152e617ab9b7ec43f09aef0f0b40e439d4b/src/mongo/db/s/chunk_splitter.cpp#L348-L349&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this comment&lt;/a&gt;:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;v4.2 behavior: chunk reaches &lt;tt&gt;maxChunkSize + &#949;&lt;/tt&gt; ---&amp;gt; split in 3 chunks&lt;/li&gt;
	&lt;li&gt;v4.4 current behavior: chunk reaches &lt;tt&gt;maxChunkSize / 2 + &#949;&lt;/tt&gt; ---&amp;gt; split in 2 chunks&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1652497">SERVER-55287</key>
            <summary>Make autosplitter behavior consistent with v4.2</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
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                <created>Thu, 18 Mar 2021 11:26:16 +0000</created>
                <updated>Mon, 21 Jun 2021 12:02:36 +0000</updated>
                            <resolved>Mon, 21 Jun 2021 12:02:36 +0000</resolved>
                                    <version>4.9.0</version>
                    <version>4.4.5</version>
                                                    <component>Sharding</component>
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