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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-24270] &quot;chunk too big to move&quot; and &quot;chunk not full enough to trigger auto-split&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-24270</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When I tried to convert a huge collection (about 0.4 billion records) to a sharding collection, I found it could not move the chunks and could not split the chunks.&lt;/p&gt;

&lt;p&gt;When the balance tried to move the chunk, I got the following error:&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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-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;2016-05-24T15:22:52.418+0800 I SHARDING [Balancer] moveChunk result: { chunkTooBig: true, estimatedChunkSize: 33553905, ok: 0.0, errmsg: &quot;chunk too big to move&quot; }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;2016-05-24T15:45:26.569+0800 W SHARDING [conn132080234] cannot move chunk: the maximum number of documents for a chunk is 250001 , the maximum chunk size is 67108864 , average document size is 133. Found 252289 documents in chunk&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;When it tried to split the chunk, I got the following error:&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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-top: 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;2016-05-24T15:22:52.530+0800 I SHARDING [Balancer] split results: CannotSplit: chunk not full enough to trigger auto-split&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;


&lt;p&gt;I use default chunk size 64MB.&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;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&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-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;mongos&amp;gt; db.settings.find()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;{ &quot;_id&quot; : &quot;chunksize&quot;, &quot;value&quot; : NumberLong(64) }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;It seems that it fails to move because the record count is &amp;gt; 250001, and fails to split because the chunk size is not large enough?&lt;/p&gt;

&lt;p&gt;My mongodbs version are 3.2.5 and 3.2.6.&lt;/p&gt;</description>
                <environment></environment>
        <key id="288919">SERVER-24270</key>
            <summary>&quot;chunk too big to move&quot; and &quot;chunk not full enough to trigger auto-split&quot;</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="bydsky">xihui he</reporter>
                        <labels>
                    </labels>
                <created>Tue, 24 May 2016 08:07:00 +0000</created>
                <updated>Wed, 25 May 2016 02:17:27 +0000</updated>
                            <resolved>Wed, 25 May 2016 02:17:27 +0000</resolved>
                                    <version>3.2.5</version>
                    <version>3.2.6</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1274306" author="ramon.fernandez" created="Wed, 25 May 2016 02:17:19 +0000"  >&lt;p&gt;Thanks for the update &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bydsky&quot; class=&quot;user-hover&quot; rel=&quot;bydsky&quot;&gt;bydsky&lt;/a&gt;. I&apos;m going to close this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19919&quot; title=&quot;Chunks that exceed 250000 docs but are under half chunk size get marked as jumbo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19919&quot;&gt;&lt;del&gt;SERVER-19919&lt;/del&gt;&lt;/a&gt; &amp;#8211; feel free to watch that ticket for updates and vote for it.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
                            <comment id="1274303" author="bydsky" created="Wed, 25 May 2016 02:12:28 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ramon.fernandez&quot; class=&quot;user-hover&quot; rel=&quot;ramon.fernandez&quot;&gt;ramon.fernandez&lt;/a&gt; We use wiredTiger. I think the issue is exactly the same as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19919&quot; title=&quot;Chunks that exceed 250000 docs but are under half chunk size get marked as jumbo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19919&quot;&gt;&lt;del&gt;SERVER-19919&lt;/del&gt;&lt;/a&gt;. I tried to reduce the chunk size to 30M and it&apos;s starting to split and move now. Thanks very much. &lt;/p&gt;</comment>
                            <comment id="1273167" author="ramon.fernandez" created="Tue, 24 May 2016 11:09:06 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bydsky&quot; class=&quot;user-hover&quot; rel=&quot;bydsky&quot;&gt;bydsky&lt;/a&gt;, please take a look at &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19919&quot; title=&quot;Chunks that exceed 250000 docs but are under half chunk size get marked as jumbo&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19919&quot;&gt;&lt;del&gt;SERVER-19919&lt;/del&gt;&lt;/a&gt;, which I think describes the exact behavior you&apos;re seeing. That ticket also contains a possible workaround that you may want to try.&lt;/p&gt;

&lt;p&gt;One quick question though: which storage engine are you using? WiredTiger or MMAPv1?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Ram&#243;n.&lt;/p&gt;</comment>
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