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    <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>[DOCS-16166] Investigate changes in SERVER-66208: Remove chunk creation for shard collection with existing data</title>
                <link>https://jira.mongodb.org/browse/DOCS-16166</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    When sharding a non-empty collection, we only create one giant chunk on the db primary shard.&lt;br/&gt;
Since we do not rely anymore on splitVector, sharding a collection is not subject anymore to the size limitation described in &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/limits/#mongodb-limit-Sharding-Existing-Collection-Data-Size&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://www.mongodb.com/docs/manual/reference/limits/#mongodb-limit-Sharding-Existing-Collection-Data-Size&lt;/a&gt;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f41717849f854e72fbe5f43e37ff5b9b5e8249ab/src/mongo/db/s/config/initial_split_policy.cpp#L313&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;UnoptimizedSplitPolicy&lt;/a&gt; for initial chunk creation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f41717849f854e72fbe5f43e37ff5b9b5e8249ab/src/mongo/db/s/config/initial_split_policy.cpp#L337-L367&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;chooses how many chunks to create using AutoSplitVector and creates all chunks on the primary shard&lt;/a&gt;. After disabling the autosplitter, it no longer makes sense to split the collection into chunks on a single shard for the initial split policy.&lt;/p&gt;

&lt;p&gt;After removing the autosplitter, we should just &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f41717849f854e72fbe5f43e37ff5b9b5e8249ab/src/mongo/db/s/config/initial_split_policy.cpp#L310&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;create a single chunk on the primary shard&lt;/a&gt;.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2352605">DOCS-16166</key>
            <summary>Investigate changes in SERVER-66208: Remove chunk creation for shard collection with existing data</summary>
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                                            <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="13201">Fixed</resolution>
                                        <assignee username="joseph.dougherty@mongodb.com">Joseph Dougherty</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                            <label>sharding</label>
                    </labels>
                <created>Mon, 29 May 2023 06:58:56 +0000</created>
                <updated>Mon, 13 Nov 2023 17:31:38 +0000</updated>
                            <resolved>Wed, 20 Sep 2023 14:40:27 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>7.1.0</fixVersion>
                    <fixVersion>7.0.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
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                            <customfieldvalue>When sharding a non-empty collection, we only create one giant chunk on the db primary shard.&lt;br/&gt;
Since we do not rely anymore on splitVector, sharding a collection is not subject anymore to the size limitation described in &lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/limits/#mongodb-limit-Sharding-Existing-Collection-Data-Size&quot;&gt;https://www.mongodb.com/docs/manual/reference/limits/#mongodb-limit-Sharding-Existing-Collection-Data-Size&lt;/a&gt;</customfieldvalue>

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