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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-7866] Balancer ignores jumbo chunks from balancing calculations</title>
                <link>https://jira.mongodb.org/browse/SERVER-7866</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently jumbo chunks are ignored from the balancing equation altogether. &lt;/p&gt;

&lt;p&gt;This means that if one shard has a large number of jumbo chunks it will achieve equilibrium with the other shards on the number of non-jumbo chunks and have the additional jumbo chunks as overhead.&lt;/p&gt;

&lt;p&gt;Eg.&lt;br/&gt;
Collection has 334 Chunks of which 70 are jumbo.&lt;br/&gt;
Shard1(primary shard) has 158 chunks (88 + 70)&lt;br/&gt;
Shard2 has 88 chunks&lt;br/&gt;
Shard3 has 88 chunks&lt;/p&gt;

&lt;p&gt;The balancer sees all three shards as having 88 chunks as the 70 jumbo chunks are ignored from the count. This leaves the cluster heavily unbalanced.&lt;/p&gt;</description>
                <environment></environment>
        <key id="58579">SERVER-7866</key>
            <summary>Balancer ignores jumbo chunks from balancing calculations</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="david.hows">David Hows</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Thu, 6 Dec 2012 23:54:00 +0000</created>
                <updated>Mon, 11 Jul 2016 17:58:38 +0000</updated>
                            <resolved>Wed, 12 Dec 2012 21:31:04 +0000</resolved>
                                    <version>2.2.0</version>
                                    <fixVersion>2.3.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="213441" author="auto" created="Wed, 12 Dec 2012 21:31:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-12-12T21:26:42Z&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-7866&quot; title=&quot;Balancer ignores jumbo chunks from balancing calculations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-7866&quot;&gt;&lt;del&gt;SERVER-7866&lt;/del&gt;&lt;/a&gt; balancer shouldn&apos;t ignore jumbo chunks, just not try and move them&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/725f626aae2c2701ded3c0f97e7b5aa4c0b65979&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/725f626aae2c2701ded3c0f97e7b5aa4c0b65979&lt;/a&gt;&lt;/p&gt;</comment>
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