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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-71609] `splitOrMarkJumbo` must not over-split chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-71609</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Now that balancing is based on data size, chunks are by default of heterogeneous sizes and it is not needed anymore to over-split them (better to keep the routing table as small as possible).&lt;/p&gt;

&lt;p&gt;When a migration fails because of a frequent shard key, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/31370a1dd8e032dfa52d9bae0af477346bbb843e/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L1777&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;splitOrMarkJumbo&lt;/a&gt; method is called and currently takes care of dividing the chunk based on the list of split points &lt;span class=&quot;error&quot;&gt;&amp;#91;potentially multiple&amp;#93;&lt;/span&gt;. &lt;/p&gt;

&lt;p&gt;This method should be simplified in order to split only on the first available point because it is only needed to mark as jumbo the chunk containing the frequent shard key. This can be achieved by passing a vector only containing the first split point &lt;a href=&quot;https://github.com/mongodb/mongo/blob/31370a1dd8e032dfa52d9bae0af477346bbb843e/src/mongo/db/s/config/sharding_catalog_manager_chunk_operations.cpp#L1866&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;as argument&lt;/a&gt; to the &lt;tt&gt;splitChunkAtMultiplePoints&lt;/tt&gt; function.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2194070">SERVER-71609</key>
            <summary>`splitOrMarkJumbo` must not over-split chunks</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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>
                    </labels>
                <created>Thu, 24 Nov 2022 09:43:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:30:06 +0000</updated>
                            <resolved>Wed, 21 Dec 2022 12:01:30 +0000</resolved>
                                                    <fixVersion>6.0.4</fixVersion>
                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5098980" author="xgen-internal-githook" created="Mon, 9 Jan 2023 08:20:44 +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-71609&quot; title=&quot;`splitOrMarkJumbo` must not over-split chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71609&quot;&gt;&lt;del&gt;SERVER-71609&lt;/del&gt;&lt;/a&gt; `splitOrMarkJumbo` must not over-split chunks&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a948883cdff5003b215857244251179334c6ef7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a948883cdff5003b215857244251179334c6ef7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5069733" author="xgen-internal-githook" created="Wed, 21 Dec 2022 11:05:45 +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-71609&quot; title=&quot;`splitOrMarkJumbo` must not over-split chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71609&quot;&gt;&lt;del&gt;SERVER-71609&lt;/del&gt;&lt;/a&gt; `splitOrMarkJumbo` must not over-split chunks&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ac8ffa47bfe83e12c361f083fdd96a721ffae60&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7ac8ffa47bfe83e12c361f083fdd96a721ffae60&lt;/a&gt;&lt;/p&gt;</comment>
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