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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-1986] make splitting smarter so chunks are more homogenous </title>
                <link>https://jira.mongodb.org/browse/SERVER-1986</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="13452">SERVER-1986</key>
            <summary>make splitting smarter so chunks are more homogenous </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="eliot">Eliot Horowitz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 22 Oct 2010 01:41:09 +0000</created>
                <updated>Tue, 12 Jul 2016 00:19:06 +0000</updated>
                            <resolved>Sun, 19 Dec 2010 13:39:57 +0000</resolved>
                                                    <fixVersion>1.7.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>3</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="28372" author="ofer@tra.cx" created="Fri, 8 Apr 2011 17:50:05 +0000"  >&lt;p&gt;i&apos;d love to try it, but since it is in our production site, i can&apos;t take the&lt;br/&gt;
risk of an unstable version. will have to wait for 1.7.4 to release.&lt;br/&gt;
a question, will it also split chunks that are already in a big size, or is&lt;br/&gt;
it only for new chunks?&lt;/p&gt;

</comment>
                            <comment id="21574" author="auto" created="Sun, 19 Dec 2010 01:42:47 +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-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; simpler mechanism for picking up split checks if mongos bounces frequently&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bfdf4ba06e770bc22389be1676b292bf9143ce1c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bfdf4ba06e770bc22389be1676b292bf9143ce1c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21570" author="auto" created="Sat, 18 Dec 2010 22:47:34 +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: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; check if split is needed every so often, even if not much data changed&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 31eadf03e2d00dab56af92570efcb3e12bf984cf.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/12764d61a0afb025a49b871ec19dfa1d45d35bc3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/12764d61a0afb025a49b871ec19dfa1d45d35bc3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21569" author="auto" created="Sat, 18 Dec 2010 22:47:33 +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: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; grid can now tell how many mongos&apos;s recently pinged&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 6aa403b260a34089bf5df1e00b2ba471fb3453e9.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e18aeaa8348b0b9b5f5a3eee6d0318a62483487&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e18aeaa8348b0b9b5f5a3eee6d0318a62483487&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21547" author="auto" created="Fri, 17 Dec 2010 23:41:39 +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-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; grid can now tell how many mongos&apos;s recently pinged&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6aa403b260a34089bf5df1e00b2ba471fb3453e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6aa403b260a34089bf5df1e00b2ba471fb3453e9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21510" author="alerner" created="Fri, 17 Dec 2010 05:30:59 +0000"  >&lt;p&gt;Just added a bit of documentation about this here:&lt;br/&gt;
&lt;a href=&quot;http://www.mongodb.org/display/DOCS/Sharding+Administration#ShardingAdministration-ChunkSizeConsiderations&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Sharding+Administration#ShardingAdministration-ChunkSizeConsiderations&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21507" author="alerner" created="Fri, 17 Dec 2010 05:02:51 +0000"  >&lt;p&gt;Ofer,&lt;/p&gt;

&lt;p&gt;We added two mechanisms to split much more aggressively here. If you wan to give it try in 1.7.4 (unstable), feedback would be appreciated.&lt;/p&gt;

&lt;p&gt;Alberto.&lt;/p&gt;</comment>
                            <comment id="21493" author="auto" created="Fri, 17 Dec 2010 01:42:23 +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-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; check if split is needed every so often, even if not much data changed&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/31eadf03e2d00dab56af92570efcb3e12bf984cf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/31eadf03e2d00dab56af92570efcb3e12bf984cf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21479" author="auto" created="Thu, 16 Dec 2010 19:42:20 +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-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; meant 250K not 2.5M&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b0bafdf7d4617b936d5ffcbfd3bcbb5727ee1efb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b0bafdf7d4617b936d5ffcbfd3bcbb5727ee1efb&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="21478" author="auto" created="Thu, 16 Dec 2010 19:41:11 +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-1986&quot; title=&quot;make splitting smarter so chunks are more homogenous &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1986&quot;&gt;&lt;del&gt;SERVER-1986&lt;/del&gt;&lt;/a&gt; more reasonable limit for docs in a split chunk&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/30c1709c2bceea522206761f2ba26ae99071965c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/30c1709c2bceea522206761f2ba26ae99071965c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="19576" author="oferfort" created="Mon, 25 Oct 2010 00:44:14 +0000"  >&lt;p&gt;This is becoming a real issue for us.&lt;br/&gt;
I have a collection that has most of the chunks at about 2M documents, but i have some that are more then 60M, this causes my shards to be very uneven.&lt;/p&gt;</comment>
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