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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-1358] Split or achor &quot;jumbo&quot; chunks</title>
                <link>https://jira.mongodb.org/browse/SERVER-1358</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We rely on a collection&apos;s sharding key  having enough distinct values so to split keys across chunks and on autosplitting working the large majority of times.&lt;/p&gt;

&lt;p&gt;If, for some reason, a very large chunk forms, we want to detect it.&lt;/p&gt;

&lt;p&gt;One point we can do that is when we get all the disklocs during a migrate. If the total size or # of objects is too big we want to fail the migrate and force a split.&lt;/p&gt;

&lt;p&gt;If we can&apos;t split them, find a way to prevent attempting to move it repeatedly.&lt;/p&gt;</description>
                <environment></environment>
        <key id="12341">SERVER-1358</key>
            <summary>Split or achor &quot;jumbo&quot; chunks</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="9">Done</resolution>
                                        <assignee username="alerner">Alberto Lerner</assignee>
                                    <reporter username="alerner">Alberto Lerner</reporter>
                        <labels>
                    </labels>
                <created>Sat, 3 Jul 2010 16:53:53 +0000</created>
                <updated>Tue, 12 Jul 2016 00:28:45 +0000</updated>
                            <resolved>Fri, 17 Dec 2010 23:00:22 +0000</resolved>
                                                    <fixVersion>1.7.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="21566" author="auto" created="Sat, 18 Dec 2010 20:23:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;alerner&apos;, u&apos;name&apos;: u&apos;Alberto Lerner&apos;, u&apos;email&apos;: u&apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1358&quot; title=&quot;Split or achor &amp;quot;jumbo&amp;quot; chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1358&quot;&gt;&lt;del&gt;SERVER-1358&lt;/del&gt;&lt;/a&gt; (Fix) chunk size accounting was using sum of all chunks on shards&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3d11d686328505c69bddb76e4abcc01443b33a6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3d11d686328505c69bddb76e4abcc01443b33a6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21544" author="auto" created="Fri, 17 Dec 2010 22:59:14 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;alerner&apos;, u&apos;name&apos;: u&apos;Alberto Lerner&apos;, u&apos;email&apos;: u&apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1358&quot; title=&quot;Split or achor &amp;quot;jumbo&amp;quot; chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1358&quot;&gt;&lt;del&gt;SERVER-1358&lt;/del&gt;&lt;/a&gt; don&apos;t migrate a chunk larger than max chunk size (but allow explicit override)&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a3b3c83f96e0642c0faed97c06e4ada2a74fe584&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a3b3c83f96e0642c0faed97c06e4ada2a74fe584&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21516" author="auto" created="Fri, 17 Dec 2010 06:09:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;alerner&apos;, u&apos;name&apos;: u&apos;Alberto Lerner&apos;, u&apos;email&apos;: u&apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1358&quot; title=&quot;Split or achor &amp;quot;jumbo&amp;quot; chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1358&quot;&gt;&lt;del&gt;SERVER-1358&lt;/del&gt;&lt;/a&gt; add a size beyond which a chunk migrate request should not go through&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7512156d5a49af0bce17abe483210d56f08caf08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7512156d5a49af0bce17abe483210d56f08caf08&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21513" author="auto" created="Fri, 17 Dec 2010 05:40:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;alerner&apos;, u&apos;name&apos;: u&apos;Alberto Lerner&apos;, u&apos;email&apos;: u&apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1358&quot; title=&quot;Split or achor &amp;quot;jumbo&amp;quot; chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1358&quot;&gt;&lt;del&gt;SERVER-1358&lt;/del&gt;&lt;/a&gt; lower maximum default chunk size&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/08bfb0143eea87c2a1b3478f06cb7578e247a3e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/08bfb0143eea87c2a1b3478f06cb7578e247a3e9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="19725" author="auto" created="Wed, 27 Oct 2010 20:44:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;login&apos;: &apos;alerner&apos;, &apos;name&apos;: &apos;Alberto Lerner&apos;, &apos;email&apos;: &apos;alerner@10gen.com&apos;}
&lt;p&gt;Message: don&apos;t split after a balance move fails (a lock taken would cause it) and defer splitting jumbos to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1358&quot; title=&quot;Split or achor &amp;quot;jumbo&amp;quot; chunks&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1358&quot;&gt;&lt;del&gt;SERVER-1358&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://github.com/mongodb/mongo/commit/d5985242144afdd8b6ea0d662d3c899a36dd0df5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://github.com/mongodb/mongo/commit/d5985242144afdd8b6ea0d662d3c899a36dd0df5&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="13452">SERVER-1986</issuekey>
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