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            <title>[SERVER-3167] during final reduce in sharded environment, all results are loaded into an in memory map</title>
                <link>https://jira.mongodb.org/browse/SERVER-3167</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;the target mongod does parallelsort from all servers, getting the records sorted.&lt;br/&gt;
It should just reduce and insert to temp collection.&lt;br/&gt;
Instead the result is emitted, which puts it into a map.&lt;br/&gt;
Then when all records are done, map is dumped to disk.&lt;br/&gt;
May be very costly in cpu and mem for large jobs&lt;/p&gt;</description>
                <environment></environment>
        <key id="17668">SERVER-3167</key>
            <summary>during final reduce in sharded environment, all results are loaded into an in memory map</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="9">Done</resolution>
                                        <assignee username="antoine">Antoine Girbal</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 May 2011 16:59:22 +0000</created>
                <updated>Tue, 12 Jul 2016 00:20:16 +0000</updated>
                            <resolved>Tue, 14 Jun 2011 07:12:14 +0000</resolved>
                                                    <fixVersion>1.9.1</fixVersion>
                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="37454" author="antoine" created="Tue, 14 Jun 2011 07:15:12 +0000"  >&lt;p&gt;Some comments on fix:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;records with similar key are put in a list, then reduced, then inserted in temp col&lt;/li&gt;
	&lt;li&gt;we may want to do extra reduce if the size of list gets too big (same as for sharded output)&lt;/li&gt;
	&lt;li&gt;it now takes 1 write lock for each insert instead of 1 lock for full dump&lt;/li&gt;
&lt;/ul&gt;
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