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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-45450] Improve the performance of $accumulator</title>
                <link>https://jira.mongodb.org/browse/SERVER-45450</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We think it will be more valuable to improve the performance of $accumulator, than to change the implementation of MapReduce to use it internally.&lt;/p&gt;

&lt;p&gt;Previous title and description:&lt;/p&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Use%24accumulatorinMapReducepipelines&quot;&gt;&lt;/a&gt;Use $accumulator in MapReduce pipelines&lt;/h3&gt;

&lt;p&gt;Change how MapReduce generates its aggregation pipeline: use $accumulator instead of $_internalJsReduce. Then remove $_internalJsReduce.&lt;/p&gt;

&lt;p&gt;We will have decided how to do the translation in the POC: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85021&quot; title=&quot;POC for $accumulator, MR on $accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85021&quot;&gt;&lt;del&gt;SERVER-45446&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="1082849">SERVER-45450</key>
            <summary>Improve the performance of $accumulator</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="david.percy@mongodb.com">David Percy</assignee>
                                    <reporter username="david.percy@mongodb.com">David Percy</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Thu, 9 Jan 2020 19:57:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:13:31 +0000</updated>
                            <resolved>Tue, 17 Mar 2020 18:22:06 +0000</resolved>
                                                    <fixVersion>4.4.0-rc0</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="2990760" author="xgen-internal-githook" created="Fri, 20 Mar 2020 20:38:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;username&apos;: &apos;dpercy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45450&quot; title=&quot;Improve the performance of $accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45450&quot;&gt;&lt;del&gt;SERVER-45450&lt;/del&gt;&lt;/a&gt; $accumulator performance&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/02e12f2b4acfb8f1d401ed78a04fe4b6e23b9976&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/02e12f2b4acfb8f1d401ed78a04fe4b6e23b9976&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2984006" author="xgen-internal-githook" created="Tue, 17 Mar 2020 19:53:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45450&quot; title=&quot;Improve the performance of $accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45450&quot;&gt;&lt;del&gt;SERVER-45450&lt;/del&gt;&lt;/a&gt; Fix lint&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/13caf3c499a22c2274bd533043eb7e06e6f8e8a4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/13caf3c499a22c2274bd533043eb7e06e6f8e8a4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2983574" author="xgen-internal-githook" created="Tue, 17 Mar 2020 17:17:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;David Percy&apos;, &apos;username&apos;: &apos;dpercy&apos;, &apos;email&apos;: &apos;david.percy@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45450&quot; title=&quot;Improve the performance of $accumulator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45450&quot;&gt;&lt;del&gt;SERVER-45450&lt;/del&gt;&lt;/a&gt; $accumulator performance&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fadc3d1cd88084567e24559f75b216158186bde8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fadc3d1cd88084567e24559f75b216158186bde8&lt;/a&gt;&lt;/p&gt;</comment>
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