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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-81100] Investigate Slow Splitting When Using sh.ShardCollection()</title>
                <link>https://jira.mongodb.org/browse/SERVER-81100</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During recent testing balancer enhancements I found that initially sharding a collection with a small chunk size will significantly increase the duration to complete sharding collection relative to sharding an empty collection and loading the data with the same chunk size.&lt;/p&gt;

&lt;p&gt;Test Scenario - MongoDB 5.0&lt;br/&gt;
1:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;4TB Collection Size&lt;/li&gt;
	&lt;li&gt;32KB Doc Size&lt;/li&gt;
	&lt;li&gt;1MB Chunk Size&lt;/li&gt;
	&lt;li&gt;Shard Existing Unsharded Collection with sh.shardCollection&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;2:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Set 1MB Chunk Size&lt;/li&gt;
	&lt;li&gt;Shard Empty Collection with sh.shardCollection&lt;/li&gt;
	&lt;li&gt;Insert Documents&lt;/li&gt;
	&lt;li&gt;32KB Doc Size&lt;/li&gt;
	&lt;li&gt;1MB Chunk Size&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Scenario 1 will take much longer than Scenario 2&lt;/p&gt;</description>
                <environment></environment>
        <key id="2443255">SERVER-81100</key>
            <summary>Investigate Slow Splitting When Using sh.ShardCollection()</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="matt.panton@mongodb.com">Matt Panton</assignee>
                                    <reporter username="matt.panton@mongodb.com">Matt Panton</reporter>
                        <labels>
                    </labels>
                <created>Fri, 15 Sep 2023 14:25:05 +0000</created>
                <updated>Tue, 10 Oct 2023 06:51:05 +0000</updated>
                                            <version>5.0.21</version>
                                                                        <votes>0</votes>
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