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            <title>[SERVER-18812] Improve aggregation with $out performance on WiredTiger</title>
                <link>https://jira.mongodb.org/browse/SERVER-18812</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Aggregation in $out are faster in MMAPv1 than on WiredTiger.&lt;/p&gt;</description>
                <environment></environment>
        <key id="208200">SERVER-18812</key>
            <summary>Improve aggregation with $out performance on WiredTiger</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</reporter>
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                <created>Wed, 3 Jun 2015 20:14:21 +0000</created>
                <updated>Fri, 5 Jun 2015 17:47:02 +0000</updated>
                            <resolved>Fri, 5 Jun 2015 17:47:02 +0000</resolved>
                                                                    <component>Aggregation Framework</component>
                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="932512" author="eliot" created="Fri, 5 Jun 2015 12:52:14 +0000"  >&lt;p&gt;This is because we are creating and destroying 2000 files.&lt;br/&gt;
I believe this should be resolved as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-17675&quot; title=&quot;Support file per database for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-17675&quot;&gt;&lt;del&gt;SERVER-17675&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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