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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-13748] Global Lock in Reduce Phase of Map/Reduce</title>
                <link>https://jira.mongodb.org/browse/SERVER-13748</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When writing results to an output collection, the map/reduce engine acquires a global write lock, effectively blocking the server for all other operations. Even when the &lt;tt&gt;nonAtomic&lt;/tt&gt; option is used, the global lock is acquired for every single document that is written, and since this happens pre-emptively, the effect is very much the same.&lt;/p&gt;

&lt;p&gt;This effectively prevents any kind of concurrency while doing map/reduce computations and should therefore be changed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="133409">SERVER-13748</key>
            <summary>Global Lock in Reduce Phase of Map/Reduce</summary>
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                                            <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="3">Duplicate</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="andre.spiegel@mongodb.com">Andre Spiegel</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Apr 2014 19:51:30 +0000</created>
                <updated>Wed, 10 Dec 2014 23:07:11 +0000</updated>
                            <resolved>Fri, 25 Apr 2014 21:11:51 +0000</resolved>
                                    <version>2.4.9</version>
                    <version>2.6.0</version>
                                                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
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