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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-71239] Balancer optimisation when looking for zone violation chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-71239</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TL;DR When looking for zone violation chunks, avoid the chunk traversal on a shard if that shard doesn&apos;t have any zone associated.&lt;/p&gt;

&lt;p&gt;Currently, the balancer process looking for zone violation chunks works this way:&lt;br/&gt;
1. &lt;a href=&quot;https://github.com/10gen/mongo/blob/b7bb32e209eaf2dd037cb86f55b687bd0d55f510/src/mongo/db/s/balancer/balancer_policy.cpp#L490&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Loop&lt;/a&gt; over all shards&lt;br/&gt;
2. &lt;a href=&quot;https://github.com/10gen/mongo/blob/b7bb32e209eaf2dd037cb86f55b687bd0d55f510/src/mongo/db/s/balancer/balancer_policy.cpp#L496&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Loop&lt;/a&gt; over all chunks of that shard&lt;br/&gt;
3. &lt;a href=&quot;https://github.com/10gen/mongo/blob/b7bb32e209eaf2dd037cb86f55b687bd0d55f510/src/mongo/db/s/balancer/balancer_policy.cpp#L502&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Check&lt;/a&gt; if chunk zone matches any zone associated to that shard&lt;/p&gt;

&lt;p&gt;In case of a shard not having any zone associated, the balancer will iterate through all the chunks of that shard anyway. This could be avoided by checking the size of &lt;tt&gt;stat.shardZones&lt;/tt&gt; before starting the second loop.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2180706">SERVER-71239</key>
            <summary>Balancer optimisation when looking for zone violation 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="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>12/12</label>
                            <label>balancer-round-perf</label>
                    </labels>
                <created>Thu, 10 Nov 2022 14:28:26 +0000</created>
                <updated>Tue, 12 Dec 2023 14:37:34 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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