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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-39234] Sharding an empty collection in mixed-shard version configurations may leave all chunks on the primary shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-39234</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In partially upgraded clusters, whose config server is at version 4.0.5 and shards are at pre-4.0.3 (includes 3.6), sharding an &lt;b&gt;empty&lt;/b&gt;&#160;collection with hashed sharding or performing map/reduce with outputting to an &lt;b&gt;empty&lt;/b&gt;&#160;collection (with any kind of sharding) will end up placing all chunks on the&#160;primary shard of the collection.&lt;/p&gt;

&lt;p&gt;This is not a correctness issue, but it means that the balancer will have to move non-empty chunks later on and thus defeats the purpose of pre-sharding the collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="679117">SERVER-39234</key>
            <summary>Sharding an empty collection in mixed-shard version configurations may leave all chunks on the primary shard</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="13201">Fixed</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Jan 2019 20:06:14 +0000</created>
                <updated>Sun, 29 Oct 2023 22:24:43 +0000</updated>
                            <resolved>Wed, 30 Jan 2019 03:36:31 +0000</resolved>
                                    <version>4.0.5</version>
                                    <fixVersion>4.0.6</fixVersion>
                    <fixVersion>4.1.8</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2132366" author="xgen-internal-githook" created="Wed, 30 Jan 2019 18:45:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;name&apos;: &apos;Kaloian Manassiev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39234&quot; title=&quot;Sharding an empty collection in mixed-shard version configurations may leave all chunks on the primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39234&quot;&gt;&lt;del&gt;SERVER-39234&lt;/del&gt;&lt;/a&gt; Ensure `shardCollection` initial split works the same between config server and shard primary&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1c61dfa3307c2009dd29c893b8d2b08af6bcf7d6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1c61dfa3307c2009dd29c893b8d2b08af6bcf7d6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2132317" author="xgen-internal-githook" created="Wed, 30 Jan 2019 18:23:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;name&apos;: &apos;Kaloian Manassiev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39234&quot; title=&quot;Sharding an empty collection in mixed-shard version configurations may leave all chunks on the primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39234&quot;&gt;&lt;del&gt;SERVER-39234&lt;/del&gt;&lt;/a&gt; Ensure `shardCollection` initial split works the same between config server and shard primary&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1c61dfa3307c2009dd29c893b8d2b08af6bcf7d6)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c9a446e51769484fc4aa911046942752c4cb9cdb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c9a446e51769484fc4aa911046942752c4cb9cdb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2132316" author="xgen-internal-githook" created="Wed, 30 Jan 2019 18:23:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;name&apos;: &apos;Kaloian Manassiev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39234&quot; title=&quot;Sharding an empty collection in mixed-shard version configurations may leave all chunks on the primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39234&quot;&gt;&lt;del&gt;SERVER-39234&lt;/del&gt;&lt;/a&gt; Remove unused variable from the shardCollection unit-test&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/93aae1b4159d4e26e6b3ec5c6b870160ba63309f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/93aae1b4159d4e26e6b3ec5c6b870160ba63309f&lt;/a&gt;&lt;/p&gt;</comment>
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