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    <description>This file is an XML representation of an issue</description>
    <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-75481] Consider ideal data size when balancing</title>
                <link>https://jira.mongodb.org/browse/SERVER-75481</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The data size aware balancing introduced in v6.0.3+ versions can potentially schedule migrations from shards under the optimal data size threshold.&lt;/p&gt;

&lt;p&gt;The chunk-based balancing was avoiding that by scheduling migrations &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3f24d5d25363a17963027526a8531202e8f3cd6e/src/mongo/db/s/balancer/balancer_policy.cpp#L583-L585&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;only from shards with a sufficiently high number of chunks&lt;/a&gt; .&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Example&lt;/b&gt;&lt;br/&gt;
There are 500GB to spread across 5 shards (100GB per shard) currently distributed in the following way:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Shard0: 200GB&lt;/li&gt;
	&lt;li&gt;Shard1: 200GB&lt;/li&gt;
	&lt;li&gt;Shard2: 50GB&lt;/li&gt;
	&lt;li&gt;Shard3: 40GB&lt;/li&gt;
	&lt;li&gt;Shard4: 10GB&lt;/li&gt;
	&lt;li&gt;Shard5: 0GB&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Next balancing round (currently):&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Shard0 donates to shard5&lt;/li&gt;
	&lt;li&gt;Shard1 donates to shard4&lt;/li&gt;
	&lt;li&gt;Shard2 donates to shard3 (this is the bug -&amp;gt; there is no real need to donate from shard2 to shard3 because they both need to reach 100GB)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Next balancing round (after this fix):&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Shard0 donates to shard5&lt;/li&gt;
	&lt;li&gt;Shard1 donates to shard4&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2301792">SERVER-75481</key>
            <summary>Consider ideal data size when balancing</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>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Thu, 30 Mar 2023 07:48:46 +0000</created>
                <updated>Fri, 1 Dec 2023 09:17:56 +0000</updated>
                            <resolved>Thu, 6 Apr 2023 10:48:55 +0000</resolved>
                                    <version>7.0.0-rc0</version>
                    <version>6.0.6</version>
                    <version>6.3.0-rc2</version>
                                    <fixVersion>7.0.0-rc0</fixVersion>
                    <fixVersion>6.0.6</fixVersion>
                    <fixVersion>6.3.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5364026" author="xgen-internal-githook" created="Thu, 20 Apr 2023 21:22:16 +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-75481&quot; title=&quot;Consider ideal data size when balancing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75481&quot;&gt;&lt;del&gt;SERVER-75481&lt;/del&gt;&lt;/a&gt; Consider ideal data size when balancing&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8a7a9f9fc2b058fc1b433f4c70843a5c9e985ff4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8a7a9f9fc2b058fc1b433f4c70843a5c9e985ff4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5363596" author="xgen-internal-githook" created="Thu, 20 Apr 2023 18:53:39 +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-75481&quot; title=&quot;Consider ideal data size when balancing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75481&quot;&gt;&lt;del&gt;SERVER-75481&lt;/del&gt;&lt;/a&gt; Consider ideal data size when balancing&lt;br/&gt;
Branch: v6.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2d1c0a3a6385bb00020374d4a8dafd08ec56c64b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2d1c0a3a6385bb00020374d4a8dafd08ec56c64b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5329228" author="xgen-internal-githook" created="Thu, 6 Apr 2023 10:17:39 +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-75481&quot; title=&quot;Consider ideal data size when balancing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75481&quot;&gt;&lt;del&gt;SERVER-75481&lt;/del&gt;&lt;/a&gt; Consider ideal data size when balancing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a23da5fc5610cdd1c7189c9c767aeb62cbf6fa01&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a23da5fc5610cdd1c7189c9c767aeb62cbf6fa01&lt;/a&gt;&lt;/p&gt;</comment>
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