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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-66208] Remove chunk creation for shard collection with existing data</title>
                <link>https://jira.mongodb.org/browse/SERVER-66208</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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="2039229">SERVER-66208</key>
            <summary>Remove chunk creation for shard collection with existing data</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="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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="allison.easton@mongodb.com">Allison Easton</reporter>
                        <labels>
                    </labels>
                <created>Wed, 4 May 2022 10:13:31 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:37 +0000</updated>
                            <resolved>Thu, 26 May 2022 08:01:36 +0000</resolved>
                                                    <fixVersion>6.0.3</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4903347" author="xgen-internal-githook" created="Fri, 14 Oct 2022 13:34:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66208&quot; title=&quot;Remove chunk creation for shard collection with existing data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66208&quot;&gt;&lt;del&gt;SERVER-66208&lt;/del&gt;&lt;/a&gt; remove non-existing excluded tests from sharding_continuous_config_stepdown.yml&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd06d401ba5b23a9b7b73c7b84c210a26bec381c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd06d401ba5b23a9b7b73c7b84c210a26bec381c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4903346" author="xgen-internal-githook" created="Fri, 14 Oct 2022 13:34:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66208&quot; title=&quot;Remove chunk creation for shard collection with existing data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66208&quot;&gt;&lt;del&gt;SERVER-66208&lt;/del&gt;&lt;/a&gt; Remove chunk creation for shard collection with existing data&lt;/p&gt;

&lt;p&gt;Co-authored-by: Kaloian Manassiev &amp;lt;kaloian.manassiev@mongodb.com&amp;gt;&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b790445018fdb3b026d9e0bcf51fedca7030e8a1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b790445018fdb3b026d9e0bcf51fedca7030e8a1&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4574321" author="xgen-internal-githook" created="Thu, 26 May 2022 07:59:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66208&quot; title=&quot;Remove chunk creation for shard collection with existing data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66208&quot;&gt;&lt;del&gt;SERVER-66208&lt;/del&gt;&lt;/a&gt; remove non-existing excluded tests from sharding_continuous_config_stepdown.yml&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a7cba7e1347cf500a7580f0335a865a2bb5baff4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a7cba7e1347cf500a7580f0335a865a2bb5baff4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4573468" author="xgen-internal-githook" created="Wed, 25 May 2022 20:24:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pierlauro Sciarelli&apos;, &apos;email&apos;: &apos;pierlauro.sciarelli@mongodb.com&apos;, &apos;username&apos;: &apos;pierlauro&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66208&quot; title=&quot;Remove chunk creation for shard collection with existing data&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66208&quot;&gt;&lt;del&gt;SERVER-66208&lt;/del&gt;&lt;/a&gt; Remove chunk creation for shard collection with existing data&lt;/p&gt;

&lt;p&gt;Co-authored-by: Kaloian Manassiev &amp;lt;kaloian.manassiev@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1646cf1bdfb3fcac4b1bed1960a747f44598e74a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1646cf1bdfb3fcac4b1bed1960a747f44598e74a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2051354">SERVER-66610</issuekey>
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            <issuekey id="2054956">SERVER-66754</issuekey>
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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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