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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-46916] Make misc. map reduce performance improvements</title>
                <link>https://jira.mongodb.org/browse/SERVER-46916</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There are a few opportunities for optimization in the special map reduce expressions that could give a 25-30% performance improvement for the map reduce sysperf workloads.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1277816">SERVER-46916</key>
            <summary>Make misc. map reduce performance improvements</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="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="eric.cox@mongodb.com">Eric Cox</reporter>
                        <labels>
                            <label>qexec-team</label>
                    </labels>
                <created>Tue, 17 Mar 2020 15:50:30 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:41 +0000</updated>
                            <resolved>Mon, 6 Apr 2020 21:23:49 +0000</resolved>
                                                    <fixVersion>4.4.0-rc2</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3035285" author="xgen-internal-githook" created="Fri, 10 Apr 2020 17:55:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;email&apos;: &apos;ian.boros@mongodb.com&apos;, &apos;username&apos;: &apos;puppyofkosh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46916&quot; title=&quot;Make misc. map reduce performance improvements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46916&quot;&gt;&lt;del&gt;SERVER-46916&lt;/del&gt;&lt;/a&gt; misc. map reduce performance improvements&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 1fa4585c079fe392650258f0654df64d29678af4)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/494017bdd1cd12f66e44a5338d4a4a2d94578f35&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/494017bdd1cd12f66e44a5338d4a4a2d94578f35&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3028333" author="ian.boros" created="Mon, 6 Apr 2020 21:23:05 +0000"  >&lt;p&gt;Re-purposing this ticket to be about misc. map reduce improvements. I moved+expanded on the original description in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47370&quot; title=&quot;Projection pushdown can hinder performance for workloads with tiny documents&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47370&quot;&gt;SERVER-47370&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3027832" author="xgen-internal-githook" created="Mon, 6 Apr 2020 17:42:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ian Boros&apos;, &apos;email&apos;: &apos;ian.boros@mongodb.com&apos;, &apos;username&apos;: &apos;puppyofkosh&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46916&quot; title=&quot;Make misc. map reduce performance improvements&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46916&quot;&gt;&lt;del&gt;SERVER-46916&lt;/del&gt;&lt;/a&gt; misc. map reduce performance improvements&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1fa4585c079fe392650258f0654df64d29678af4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1fa4585c079fe392650258f0654df64d29678af4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3019056" author="eric.cox" created="Tue, 31 Mar 2020 14:22:12 +0000"  >&lt;p&gt;My initial patch that disabled the project pushdown showed a 30% - 40% gain over the current regressions.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://evergreen.mongodb.com/task/sys_perf_linux_standalone_map_reduce_workloads_patch_80c8c36136070c72c29b3dc8b5d815440f7bd373_5e74da84a4cf4721ea1cd6b8_20_03_20_15_01_29##%257B%2522compare%2522%253A%255B%257B%2522hash%2522%253A%252280c8c36136070c72c29b3dc8b5d815440f7bd373%2522%257D%255D%257D&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://evergreen.mongodb.com/task/sys_perf_linux_standalone_map_reduce_workloads_patch_80c8c36136070c72c29b3dc8b5d815440f7bd373_5e74da84a4cf4721ea1cd6b8_20_03_20_15_01_29##%257B%2522compare%2522%253A%255B%257B%2522hash%2522%253A%252280c8c36136070c72c29b3dc8b5d815440f7bd373%2522%257D%255D%257D&lt;/a&gt;&lt;/p&gt;</comment>
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