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            <title>[SERVER-3092] M/R threshold for running reduces and dumping data to disk are too low, resulting in more CPU and disk I/O</title>
                <link>https://jira.mongodb.org/browse/SERVER-3092</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Right now we:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;go through whole map every 100 emits, and if it&apos;s over 50KB we try to reduce each key&lt;/li&gt;
	&lt;li&gt;every 100 emits, if map is over 100KB, it is dumped to disk in a collection.&lt;br/&gt;
When these threshold are increased you get faster execution.&lt;br/&gt;
Notably a user reported than on a collection with millions of entries and 1KB objects, the incremental dumps actually add up to a massive collection on disk, since there is almost no reduce done ahead of time.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="17066">SERVER-3092</key>
            <summary>M/R threshold for running reduces and dumping data to disk are too low, resulting in more CPU and disk I/O</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="antoine">Antoine Girbal</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
                        <labels>
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                <created>Fri, 13 May 2011 22:22:20 +0000</created>
                <updated>Tue, 12 Jul 2016 00:17:17 +0000</updated>
                            <resolved>Fri, 13 May 2011 23:33:58 +0000</resolved>
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                            <timeestimate seconds="10800">3 hours</timeestimate>
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                            <comment id="32692" author="auto" created="Fri, 13 May 2011 23:25:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;agirbal&apos;, u&apos;name&apos;: u&apos;agirbal&apos;, u&apos;email&apos;: u&apos;antoine@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3092&quot; title=&quot;M/R threshold for running reduces and dumping data to disk are too low, resulting in more CPU and disk I/O&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3092&quot;&gt;&lt;del&gt;SERVER-3092&lt;/del&gt;&lt;/a&gt;: M/R threshold for running reduces and dumping data to disk are too low, resulting in more CPU and disk I/O&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d43037f1982f94a406f2fdcfaaf034fd6ca865b0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d43037f1982f94a406f2fdcfaaf034fd6ca865b0&lt;/a&gt;&lt;/p&gt;</comment>
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