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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-76405] Reduce the initial minimum number of chunks to 1 per shard for empty collections with hashed shard key</title>
                <link>https://jira.mongodb.org/browse/SERVER-76405</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Following the removal of the auto-splitter in versions &amp;gt;= v6.0.3, balancing does not happen anymore on number of chunks but on actual data size and the balancer is issuing &lt;tt&gt;moveRange&lt;/tt&gt; commands (&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-15363&quot; title=&quot;Publicly document `moveRange` command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-15363&quot;&gt;&lt;del&gt;DOCS-15363&lt;/del&gt;&lt;/a&gt;) to atomically split+move subparts of a chunk.&lt;/p&gt;

&lt;p&gt;Purpose of this ticket is to change the default behavior for creating/distributing chunks when sharding an empty collection with hashed shard key: one chunk per shard, in line with the decision taken also for resharding (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68050&quot; title=&quot;Change resharding split policy to create one chunk per shard by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68050&quot;&gt;SERVER-68050&lt;/a&gt;).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2320797">SERVER-76405</key>
            <summary>Reduce the initial minimum number of chunks to 1 per shard for empty collections with hashed shard key</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="robert.sander@mongodb.com">Robert Sander</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Fri, 21 Apr 2023 13:24:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:41 +0000</updated>
                            <resolved>Tue, 17 Oct 2023 15:19:29 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5786841" author="JIRAUSER1274957" created="Wed, 18 Oct 2023 07:17:39 +0000"  >&lt;p&gt;Added the downstream impact on Docs. Thanks!&lt;/p&gt;</comment>
                            <comment id="5785025" author="xgen-internal-githook" created="Tue, 17 Oct 2023 15:15:36 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Robert Sander&apos;, &apos;email&apos;: &apos;robert.sander@mongodb.com&apos;, &apos;username&apos;: &apos;robsndr&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76405&quot; title=&quot;Reduce the initial minimum number of chunks to 1 per shard for empty collections with hashed shard key&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76405&quot;&gt;&lt;del&gt;SERVER-76405&lt;/del&gt;&lt;/a&gt; Reduce the initial minimum number of chunks to 1 per shard for empty collections with hashed shard key&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3c62f258d138d80f506e4fa4af15893622ab2884&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3c62f258d138d80f506e4fa4af15893622ab2884&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5380432" author="pierlauro.sciarelli" created="Thu, 27 Apr 2023 09:51:01 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Is the change going from 2 chunks per shard to just one?&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Correct. Not a big deal, only for not getting users confused on the usefulness of having more chunks.&lt;/p&gt;</comment>
                            <comment id="5380430" author="JIRAUSER1256927" created="Thu, 27 Apr 2023 09:48:54 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pierlauro.sciarelli%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;pierlauro.sciarelli@mongodb.com&quot;&gt;pierlauro.sciarelli@mongodb.com&lt;/a&gt; : Is the change going from 2 chunks per shard to just one?&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="2477283">DOCS-16446</issuekey>
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                            <issuelinktype id="10012">
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2471461">SERVER-82068</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2460578">SERVER-81884</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2475296">SERVER-82216</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2285727">SERVER-74747</issuekey>
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