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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-25965] Sharding balancer always bounces a single extra chunk if there are less than 20 chunks in total</title>
                <link>https://jira.mongodb.org/browse/SERVER-25965</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The logic in the sharding balancer policy uses an integer division in order to determine the optimal number of chunks per shard in a cluster. Because of this, the result gets rounded down, which makes the optimal number of chunks in a cluster with 3 chunks and 2 shards to be 1. Because of this, the balancer will move a chunk on each iteration and the cluster will never be deemed &quot;balanced&quot;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="314235">SERVER-25965</key>
            <summary>Sharding balancer always bounces a single extra chunk if there are less than 20 chunks in total</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Sep 2016 14:30:20 +0000</created>
                <updated>Sat, 19 Nov 2016 00:04:48 +0000</updated>
                            <resolved>Tue, 6 Sep 2016 20:23:42 +0000</resolved>
                                    <version>3.3.12</version>
                                    <fixVersion>3.3.14</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1377691" author="xgen-internal-githook" created="Tue, 6 Sep 2016 20:15:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25965&quot; title=&quot;Sharding balancer always bounces a single extra chunk if there are less than 20 chunks in total&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25965&quot;&gt;&lt;del&gt;SERVER-25965&lt;/del&gt;&lt;/a&gt; Use &apos;ceil&apos; division when determining the optimal number of chunks per shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/175408e60358fe0407a4c24e8057a73f0031a9a3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/175408e60358fe0407a4c24e8057a73f0031a9a3&lt;/a&gt;&lt;/p&gt;</comment>
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