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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-44172] Chunk balancer should account for total chunks per shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-44172</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We had an existing database cluster of 2 shards that backed a multi-tenant testing environment. That environment had the following:&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;That is, many of these databases contained over 50 collections, each representing a different supported feature, but each with very little data. Thus, they were subject to the default chunk count at the time they were created; 4 chunks, 2 on each of the shards.&lt;/p&gt;

&lt;p&gt;As this test environment continues to grow, we found we needed to add a 3rd shard. We did, and that moved some chunks, but then it stopped. At this time, here is the chunk distribution.&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;After confirming that the balancer is working properly, we think we&apos;ve isolated this to a missing heuristic in the balancer.&lt;/p&gt;

&lt;p&gt;The balancer will balance each collection, and we&apos;ve observed that working properly for years. However, it does not take into account the total number of chunks per shard, and so in a situation such as this, it does not properly balance these smaller collections across the cluster.&lt;/p&gt;</description>
                <environment></environment>
        <key id="976969">SERVER-44172</key>
            <summary>Chunk balancer should account for total chunks per shard</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="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="4">Incomplete</resolution>
                                        <assignee username="carl.champain@mongodb.com">Carl Champain</assignee>
                                    <reporter username="aaron.westendorf">Aaron Westendorf</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Oct 2019 14:04:54 +0000</created>
                <updated>Wed, 4 Dec 2019 19:52:14 +0000</updated>
                            <resolved>Wed, 4 Dec 2019 19:52:14 +0000</resolved>
                                    <version>3.6.12</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2583933" author="carl.champain" created="Wed, 4 Dec 2019 19:52:05 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aaron.westendorf&quot; class=&quot;user-hover&quot; rel=&quot;aaron.westendorf&quot;&gt;aaron.westendorf&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;We haven&#8217;t heard back from you for some time, so I&#8217;m going to mark this ticket as resolved. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Carl&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
                            <comment id="2528542" author="carl.champain" created="Mon, 11 Nov 2019 15:44:55 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aaron.westendorf&quot; class=&quot;user-hover&quot; rel=&quot;aaron.westendorf&quot;&gt;aaron.westendorf&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Any updates on this issue?&lt;/p&gt;</comment>
                            <comment id="2507298" author="carl.champain" created="Tue, 29 Oct 2019 19:20:54 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aaron.westendorf&quot; class=&quot;user-hover&quot; rel=&quot;aaron.westendorf&quot;&gt;aaron.westendorf&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Could you also provide a &lt;a href=&quot;https://docs.mongodb.com/manual/reference/program/mongodump/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodump&lt;/a&gt; of the config server database? Please use the secure uploader in my first comment.&lt;/p&gt;

&lt;p&gt;We suspect that the described issue is a known behavior with the balancer as it currently looks at one collection at a time only.&lt;/p&gt;

&lt;p&gt;Thank you,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
                            <comment id="2501094" author="carl.champain" created="Fri, 25 Oct 2019 15:27:43 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aaron.westendorf&quot; class=&quot;user-hover&quot; rel=&quot;aaron.westendorf&quot;&gt;aaron.westendorf&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for taking the time to submit this report.&lt;/p&gt;

&lt;p&gt;A few questions to help us going forward:&lt;br/&gt;
1. Can you share the existing config server primary logs covering this behavior&apos;s timeframe?&lt;br/&gt;
2. Can you share the config server primary logs with the &quot;sharding&quot; component verbosity at level 1? Use this configuration for three minutes, then you can set the level back to what you were using.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
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&lt;p/&gt;
&lt;p&gt;3. Can you run &lt;tt&gt;sh.status()&lt;/tt&gt; in &lt;tt&gt;mongos&lt;/tt&gt; and also share the output?&lt;/p&gt;

&lt;p&gt;Please upload your files to our secure uploader&#160;&lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/2cf35d1b-a659-4ffc-961b-65bb76c426d4.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. Only MongoDB engineers can view these files and they will expire after a period time.&lt;br/&gt;
 &#160;&lt;br/&gt;
 Kind regards,&lt;br/&gt;
 Carl&lt;/p&gt;</comment>
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