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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-66041] Chunk cloner must never consider `too big` a chunk with only one document</title>
                <link>https://jira.mongodb.org/browse/SERVER-66041</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;tt&gt;MigrationChunkClonerSourceLegacy&lt;/tt&gt; is using the average object size to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1552a2410700068e997585a398fb002a8a740492/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L926&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;estimate&lt;/a&gt; how many objects a full chunk would be able to contain. However, the current semantic is disallowing moving chunks containing exactly one document whose size is greater than collection&apos;s max chunk size.&lt;/p&gt;

&lt;p&gt;Trivial scenario to reproduce the bug:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Set the default chunk size to 1MB&lt;/li&gt;
	&lt;li&gt;Create a collection with 100 chunks each containing one documents of 1.1 MB&lt;/li&gt;
	&lt;li&gt;Balancing will never happen because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1552a2410700068e997585a398fb002a8a740492/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L926&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;maxRecsWhenFull&lt;/a&gt; will be set to zero so it&apos;s not even possible to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/1552a2410700068e997585a398fb002a8a740492/src/mongo/db/s/migration_chunk_cloner_source_legacy.cpp#L927&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;pad some slack&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2035331">SERVER-66041</key>
            <summary>Chunk cloner must never consider `too big` a chunk with only one document</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="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</assignee>
                                    <reporter username="pierlauro.sciarelli@mongodb.com">Pierlauro Sciarelli</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Apr 2022 09:50:32 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:52 +0000</updated>
                            <resolved>Thu, 28 Apr 2022 10:55:59 +0000</resolved>
                                                    <fixVersion>5.3.2</fixVersion>
                    <fixVersion>5.0.9</fixVersion>
                    <fixVersion>6.0.0-rc4</fixVersion>
                    <fixVersion>4.4.15</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4515739" author="xgen-internal-githook" created="Fri, 29 Apr 2022 10:42:39 +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-66041&quot; title=&quot;Chunk cloner must never consider `too big` a chunk with only one document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66041&quot;&gt;&lt;del&gt;SERVER-66041&lt;/del&gt;&lt;/a&gt; Chunk cloner must never consider `too big` a chunk with only one document&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f38decf33bb2c9d12ae45db8fca67f02b880d60f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f38decf33bb2c9d12ae45db8fca67f02b880d60f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4515662" author="xgen-internal-githook" created="Fri, 29 Apr 2022 09:39:15 +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-66041&quot; title=&quot;Chunk cloner must never consider `too big` a chunk with only one document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66041&quot;&gt;&lt;del&gt;SERVER-66041&lt;/del&gt;&lt;/a&gt; Chunk cloner must never consider `too big` a chunk with only one document&lt;br/&gt;
Branch: v5.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0cd9f85a25b2edd2da55917c91f7428b05730361&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0cd9f85a25b2edd2da55917c91f7428b05730361&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4515658" author="xgen-internal-githook" created="Fri, 29 Apr 2022 09:37:17 +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-66041&quot; title=&quot;Chunk cloner must never consider `too big` a chunk with only one document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66041&quot;&gt;&lt;del&gt;SERVER-66041&lt;/del&gt;&lt;/a&gt; Chunk cloner must never consider `too big` a chunk with only one document&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e714e06e04a828fc6514be83e5eed8fc40f4a529&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e714e06e04a828fc6514be83e5eed8fc40f4a529&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4515647" author="xgen-internal-githook" created="Fri, 29 Apr 2022 09:33:04 +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-66041&quot; title=&quot;Chunk cloner must never consider `too big` a chunk with only one document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66041&quot;&gt;&lt;del&gt;SERVER-66041&lt;/del&gt;&lt;/a&gt; Chunk cloner must never consider `too big` a chunk with only one document&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b25bbb083350c46e59bd5f66a7a44d7dfbdbbd1a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b25bbb083350c46e59bd5f66a7a44d7dfbdbbd1a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4512474" author="xgen-internal-githook" created="Thu, 28 Apr 2022 10:54:05 +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-66041&quot; title=&quot;Chunk cloner must never consider `too big` a chunk with only one document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66041&quot;&gt;&lt;del&gt;SERVER-66041&lt;/del&gt;&lt;/a&gt; Chunk cloner must never consider `too big` a chunk with only one document&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cb3e17d25762581deacefb88d7fd7ceab5eec3ba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cb3e17d25762581deacefb88d7fd7ceab5eec3ba&lt;/a&gt;&lt;/p&gt;</comment>
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