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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-20678] MapReduce performance Issue with 3.1.x</title>
                <link>https://jira.mongodb.org/browse/SERVER-20678</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is a performance regression with 3.1.x related to MapReduce, may due to JS changes. More repro details in comments. This is storageEngine independent, both WT and MMAP show regression. The issue shows up in standalone as well as shard setup.&lt;/p&gt;

&lt;p&gt;The latest master also show some regression vs. 3.1.8. &lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/91732/91732_screenshot-1.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="231881">SERVER-20678</key>
            <summary>MapReduce performance Issue with 3.1.x</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="rui.zhang">Rui Zhang</reporter>
                        <labels>
                            <label>sys-perf-reg</label>
                    </labels>
                <created>Tue, 29 Sep 2015 02:26:49 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:12 +0000</updated>
                            <resolved>Tue, 13 Oct 2015 19:31:24 +0000</resolved>
                                    <version>3.1.9</version>
                                    <fixVersion>3.2.0-rc0</fixVersion>
                                    <component>JavaScript</component>
                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1059428" author="acm" created="Tue, 13 Oct 2015 19:31:24 +0000"  >&lt;p&gt;Re-resolving. We will fix the BF failure under the &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19614&quot; title=&quot;Recursive function crashes server&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19614&quot;&gt;&lt;del&gt;SERVER-19614&lt;/del&gt;&lt;/a&gt; ticket.&lt;/p&gt;</comment>
                            <comment id="1058901" author="rui.zhang" created="Tue, 13 Oct 2015 13:10:08 +0000"  >&lt;p&gt;sys-perf show performance recovered, chart show perf vs. 3.0.6. 3.1.6 and 3.1.8&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/93779/93779_post-fix-sys-perf.png&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;</comment>
                            <comment id="1058889" author="max.hirschhorn@10gen.com" created="Tue, 13 Oct 2015 12:49:51 +0000"  >&lt;p&gt;Reopening the ticket so failure with recursion.js can be resolved.&lt;/p&gt;</comment>
                            <comment id="1058070" author="xgen-internal-githook" created="Mon, 12 Oct 2015 16:26:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20678&quot; title=&quot;MapReduce performance Issue with 3.1.x&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20678&quot;&gt;&lt;del&gt;SERVER-20678&lt;/del&gt;&lt;/a&gt; Create a new JS scope for each mapreduce&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/644e0a886850763603de5c40498c26f78c1f4751&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/644e0a886850763603de5c40498c26f78c1f4751&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="93779" name="post-fix-sys-perf.png" size="24313" author="rui.zhang" created="Tue, 13 Oct 2015 13:09:03 +0000"/>
                            <attachment id="91732" name="screenshot-1.png" size="98843" author="rui.zhang" created="Tue, 29 Sep 2015 02:35:14 +0000"/>
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