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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-13106] about an uneven chunk distribution</title>
                <link>https://jira.mongodb.org/browse/SERVER-13106</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Shard001 chunks is 1000 large than other&#8216;s shard;&lt;br/&gt;
How  I slove it? this msg :&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                logsystem.logs chunks:&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                shard002        2762&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                shard000        2761&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                shard003        2768&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                shard004        2764&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                                shard001        3712&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
&lt;p&gt;hope your answer &#65292;thx!!!&lt;/p&gt;</description>
                <environment></environment>
        <key id="118939">SERVER-13106</key>
            <summary>about an uneven chunk distribution</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="stephen.steneker@mongodb.com">Stennie Steneker</assignee>
                                    <reporter username="kekefish8">liao</reporter>
                        <labels>
                    </labels>
                <created>Sat, 8 Mar 2014 06:29:58 +0000</created>
                <updated>Tue, 18 Mar 2014 02:01:35 +0000</updated>
                            <resolved>Tue, 18 Mar 2014 02:01:35 +0000</resolved>
                                    <version>2.2.2</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="518054" author="stennie" created="Tue, 18 Mar 2014 02:01:35 +0000"  >&lt;p&gt;Hi Liao,&lt;/p&gt;

&lt;p&gt;As Scott noted the appropriate forum for this sort of support question is the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user discussion group&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Some common reasons for a chunk imbalance include:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/manage-sharded-cluster-balancer/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sharded cluster balancer&lt;/a&gt; is turned off and you have chosen a monotonically increasing &lt;a href=&quot;http://docs.mongodb.org/manual/core/sharding-shard-key/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;shard key&lt;/a&gt; (such as an ObjectID) which causes all inserts to go to the same shard&lt;/li&gt;
	&lt;li&gt;your shard key has poor cardinality, leading to creation of &quot;jumbo chunks&quot; that cannot be further divided (and will not be migrated)&lt;/li&gt;
	&lt;li&gt;you have set some values such as &lt;a href=&quot;http://docs.mongodb.org/manual/core/tag-aware-sharding/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tag aware sharding&lt;/a&gt; or &lt;a href=&quot;http://docs.mongodb.org/manual/tutorial/configure-sharded-cluster-balancer/#sharded-cluster-config-max-shard-size&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;maxSize&lt;/tt&gt;&lt;/a&gt; which can affect the chunk distribution&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It&apos;s impossible to know what the cause might be in your specific case without further information. If you are still interested in investigating, I would suggest starting a discussion on the mongodb-user group with extra details including:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;description of the shard key for your collection&lt;/li&gt;
	&lt;li&gt;whether the balancer is enabled&lt;/li&gt;
	&lt;li&gt;updated count of chunks (to see if the distribution is changing over time)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Stephen&lt;/p&gt;</comment>
                            <comment id="512023" author="scotthernandez" created="Sat, 8 Mar 2014 15:36:11 +0000"  >&lt;p&gt;Can you please attach the logs from your mongos server which is acting as the balancer and a mongodump of your config database? If you are unsure which node is the balancer then just attach the config db mongodump and we can look to see which logs we would need.&lt;/p&gt;

&lt;p&gt;Also, these questions are best asked on the community mongodb-users (&lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/group/mongodb-user&lt;/a&gt;) where questions like may already have answers. This jira project is primarily for filing issues for bugs, features and the like.&lt;/p&gt;</comment>
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