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    <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-74584] Splitting chunks for zone violations must not impact scalability</title>
                <link>https://jira.mongodb.org/browse/SERVER-74584</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Within the balancer round we are &lt;a href=&quot;https://github.com/10gen/mongo/blob/6c9adc9a2d518fa046c7739e043a568f9bee6931/src/mongo/db/s/balancer/balancer.cpp#L799&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;travearsing all the chunks per collection to check if any chunk needs to be split&lt;/a&gt; due to zone violations. The aim of this ticket is to reduce the amount of time this check takes in case of having a large number of collections.&lt;/p&gt;

&lt;p&gt;A proposal is to modify the &lt;a href=&quot;https://github.com/10gen/mongo/blob/728500f59d1a6be4fd95b8ffa7d3c7dd122b25be/src/mongo/db/s/balancer/balancer_chunk_selection_policy_impl.cpp#L344&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;selectChunksToSplit&lt;/a&gt; implementation and perform a query joining &lt;tt&gt;config.tags&lt;/tt&gt; and &lt;tt&gt;config.chunks&lt;/tt&gt; to find the chunks violating zones instead of bringing to memory all the zones and all the collection distributions.&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2280562">SERVER-74584</key>
            <summary>Splitting chunks for zone violations must not impact scalability</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="silvia.surroca@mongodb.com">Silvia Surroca</reporter>
                        <labels>
                            <label>balancer-round-perf</label>
                            <label>oldshardingemea</label>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Fri, 3 Mar 2023 12:54:33 +0000</created>
                <updated>Thu, 26 Oct 2023 10:11:56 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>4</watches>
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