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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>
    </build-info>


<item>
            <title>[SERVER-20392] Sharding an existing small collection results in large number of chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-20392</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Creating a small collection (about &amp;lt; 4M) and then sharding the collection triggers a multi-split generating a large number of chunks (possibly thousands).&lt;/p&gt;

&lt;p&gt;Some examples:&lt;br/&gt;
For 20000 initial documents containing only an ObjectId and an int, inserting 7 additional similar documents will trigger a split into 1819 chunks.&lt;br/&gt;
For 90000 initial documents containing only an ObjectId and an int, inserting 7 additional similar documents will trigger a split into 8183 chunks.&lt;br/&gt;
A hard limit is reached at 8192 and with 100000 + 7 documents, no split occurs.&lt;/p&gt;

&lt;p&gt;The behavior was observed with the following variations:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;enabling/disabling the balancer&lt;/li&gt;
	&lt;li&gt;monotonically increasing shard key / hashed shard key&lt;/li&gt;
	&lt;li&gt;1 or 2 shards&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The behavior did not occur on 2.6.11: only a few chunks are created (3 in the case of 20007 documents described before).&lt;/p&gt;</description>
                <environment></environment>
        <key id="229580">SERVER-20392</key>
            <summary>Sharding an existing small collection results in large number of chunks</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="kevin.pulo@mongodb.com">Kevin Pulo</assignee>
                                    <reporter username="yves.duhem">Yves Duhem</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Sep 2015 15:12:58 +0000</created>
                <updated>Tue, 28 Aug 2018 10:11:33 +0000</updated>
                            <resolved>Wed, 9 Aug 2017 04:38:29 +0000</resolved>
                                    <version>3.0.6</version>
                    <version>3.2.11</version>
                    <version>3.4.0</version>
                                    <fixVersion>3.4.9</fixVersion>
                    <fixVersion>3.5.12</fixVersion>
                                    <component>Sharding</component>
                                        <votes>5</votes>
                                    <watches>28</watches>
                                                                                                                <comments>
                            <comment id="1656784" author="xgen-internal-githook" created="Fri, 25 Aug 2017 01:15:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;devkev&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;name&apos;: &apos;Kevin Pulo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20392&quot; title=&quot;Sharding an existing small collection results in large number of chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20392&quot;&gt;&lt;del&gt;SERVER-20392&lt;/del&gt;&lt;/a&gt; remove early chunksize autosplit heuristic&lt;/p&gt;

&lt;p&gt;Plus some additional 3.4-specific jstest fixes.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit ad6a668da49c61a4276749aef7529088dc3524ea)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e1f5f40fc17f99fc06dda4621564db7e31be1132&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e1f5f40fc17f99fc06dda4621564db7e31be1132&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1643752" author="xgen-internal-githook" created="Wed, 9 Aug 2017 04:33:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;devkev&apos;, &apos;email&apos;: &apos;kevin.pulo@mongodb.com&apos;, &apos;name&apos;: &apos;Kevin Pulo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20392&quot; title=&quot;Sharding an existing small collection results in large number of chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20392&quot;&gt;&lt;del&gt;SERVER-20392&lt;/del&gt;&lt;/a&gt; remove early chunksize autosplit heuristic&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9f2e54384d90ab0c533c6d311337d6bcc8fb5679&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9f2e54384d90ab0c533c6d311337d6bcc8fb5679&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1524435" author="pedrorochagoncalves" created="Wed, 15 Mar 2017 11:35:37 +0000"  >&lt;p&gt;I believe I was affected by this as well:&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.dnsServerFullAgTs.getShardDistribution()&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;Shard rs1 at rs1/msc1-1.stg:27017,msc1-2.stg:27017&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;   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; data : 10.45MiB docs : 17114 chunks : 299&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;   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; estimated data per chunk : 35KiB&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;   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; estimated docs per chunk : 57&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;Shard rs2 at rs2/msc2-1.stg:27017,msc2-2.stg:27017&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;   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; data : 9.17MiB docs : 12874 chunks : 300&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;   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; estimated data per chunk : 31KiB&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;   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; estimated docs per chunk : 42&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;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;Totals&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;   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; data : 19.62MiB docs : 29988 chunks : 599&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;   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; Shard rs1 contains 53.24% data, 57.06% docs in cluster, avg obj size on shard : 640B&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; Shard rs2 contains 46.75% data, 42.93% docs in cluster, avg obj size on shard : 747B&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;This seems like an unusually large number of chunks for such a small collection. The number of chunks was actually close to 1k, but we merged empty chunks. Unfortunately our script doesn&apos;t seem to find more empty chunks to merge. We&apos;re running MongoDB 3.2. &lt;/p&gt;</comment>
                            <comment id="1204791" author="hoyt ren" created="Wed, 16 Mar 2016 02:31:29 +0000"  >&lt;p&gt;It seems I meet the same problem, by the way, why the index is so large, the indexed field is just a integer. Tell me if need more detailed info.&lt;/p&gt;

&lt;p&gt;db.pop_store.stats()&lt;br/&gt;
{&lt;br/&gt;
	&quot;sharded&quot; : true,&lt;br/&gt;
	&quot;capped&quot; : false,&lt;br/&gt;
	&quot;ns&quot; : &quot;business_message.pop_store&quot;,&lt;br/&gt;
	&quot;count&quot; : 3286,&lt;br/&gt;
	&quot;size&quot; : 908238,&lt;br/&gt;
	&quot;storageSize&quot; : 548864,&lt;br/&gt;
	&quot;totalIndexSize&quot; : 507904,&lt;br/&gt;
	&quot;indexSizes&quot; : &lt;/p&gt;
{
		&quot;_id_&quot; : 139264,
		&quot;sk_store_id&quot; : 208896,
		&quot;store_id_1&quot; : 159744
	}
&lt;p&gt;,&lt;br/&gt;
	&quot;avgObjSize&quot; : 276.39622641509436,&lt;br/&gt;
	&quot;nindexes&quot; : 3,&lt;br/&gt;
	&quot;nchunks&quot; : 1629,&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>9223372036854775807</customfieldvalue>
                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                <customfield id="customfield_10557" key="com.pyxis.greenhopper.jira:gh-sprint">
                        <customfieldname>Sprint</customfieldname>
                        <customfieldvalues>
                                <customfieldvalue id="1316">Sharding 2017-01-02</customfieldvalue>
    <customfieldvalue id="1727">Sharding 2017-07-31</customfieldvalue>

                        </customfieldvalues>
                    </customfield>
                                                                                                                        <customfield id="customfield_10750" key="com.atlassian.jira.plugin.system.customfieldtypes:textarea">
                        <customfieldname>Steps To Reproduce</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>&lt;p&gt;To reproduce:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;set up a sharded cluster (1 single node shard is enough)&lt;/li&gt;
	&lt;li&gt;create a collection and fill it 20000 small documents containing only an int&lt;/li&gt;
	&lt;li&gt;shard the collection&lt;/li&gt;
	&lt;li&gt;insert a few more documents through the same mongos (the number will depend on the size of each document)&lt;br/&gt;
A multi-split occurs, generating a high number of small chunks.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Attached is a javascript file with these steps.&lt;/p&gt;</customfieldvalue>

                        </customfieldvalues>
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                                                                                                                                                                                                                                                                    <customfield id="customfield_10053" key="com.atlassian.jira.ext.charting:timeinstatus">
                        <customfieldname>Time In Status</customfieldname>
                        <customfieldvalues>
                            
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                        <customfield id="customfield_22870" key="com.onresolve.jira.groovy.groovyrunner:scripted-field">
                        <customfieldname>Triagers</customfieldname>
                        <customfieldvalues>
                                

                        </customfieldvalues>
                    </customfield>
                                                                                                                                                                                                                                                                                                                                                                                    <customfield id="customfield_14350" key="com.pyxis.greenhopper.jira:gh-lexo-rank">
                        <customfieldname>serverRank</customfieldname>
                        <customfieldvalues>
                            <customfieldvalue>1|hsfo4n:</customfieldvalue>

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