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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-71038] Investigate LLT mixed regressions</title>
                <link>https://jira.mongodb.org/browse/SERVER-71038</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&apos;table-wrap&apos;&gt;
&lt;table class=&apos;confluenceTable&apos;&gt;&lt;tbody&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Long.Query.Baseline.findOne&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-30.18878612&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;Long.Query.Benchmark.findOne&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-22.61465156&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;Medium.Query.Baseline.findOne&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-24.30839036&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;Medium.Query.Benchmark.findOne&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-24.05129074&lt;/td&gt;
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&lt;td class=&apos;confluenceTd&apos;&gt;Short.Query.Benchmark.findOne&lt;/td&gt;
&lt;td class=&apos;confluenceTd&apos;&gt;-26.9140599&lt;br/&gt;
&#160;&lt;/td&gt;
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&lt;p&gt;Oddly enough I feel that this shouldn&apos;t be an issue because it&apos;s a findOne query, but it&apos;s not clear what the predicate is.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2173654">SERVER-71038</key>
            <summary>Investigate LLT mixed regressions</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mihai.andrei@mongodb.com">Mihai Andrei</reporter>
                        <labels>
                            <label>pm2697-m3</label>
                    </labels>
                <created>Wed, 2 Nov 2022 21:38:40 +0000</created>
                <updated>Fri, 2 Feb 2024 23:18:57 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5323502" author="ian.boros" created="Tue, 4 Apr 2023 15:16:14 +0000"  >&lt;p&gt;Summary: the regressions in the findOne queries appear to be the same cause as for many other short-running queries: A lot of time is spent constructing the plan (nearly half).&lt;/p&gt;

&lt;p&gt;Per in person discussion last week, I&apos;m moving this to the backlog since it&apos;s been bumped to the next project, and there&apos;s other ongoing work to make plan creation/cloning faster.&lt;/p&gt;</comment>
                            <comment id="5245412" author="david.storch" created="Thu, 2 Mar 2023 23:29:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alberto.massari%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alberto.massari@mongodb.com&quot;&gt;alberto.massari@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mihai.andrei%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;mihai.andrei@mongodb.com&quot;&gt;mihai.andrei@mongodb.com&lt;/a&gt; are the llt_mixed workloads now no longer showing a regression in SBE after these changes? If there is still a regression, then we should keep this ticket open for now.&lt;/p&gt;

&lt;p&gt;Also, note that the work that &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=zixuan.zhuang%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;zixuan.zhuang@mongodb.com&quot;&gt;zixuan.zhuang@mongodb.com&lt;/a&gt; is doing in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72803&quot; title=&quot;Cache hinted SBE queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72803&quot;&gt;&lt;del&gt;SERVER-72803&lt;/del&gt;&lt;/a&gt; results in a significant improvement for some of the llt_mixed workloads.&#160;&lt;/p&gt;</comment>
                            <comment id="5243116" author="xgen-internal-githook" created="Thu, 2 Mar 2023 10:14:41 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Alberto Massari&apos;, &apos;email&apos;: &apos;alberto.massari@mongodb.com&apos;, &apos;username&apos;: &apos;albymassari&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-71038&quot; title=&quot;Investigate LLT mixed regressions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-71038&quot;&gt;SERVER-71038&lt;/a&gt; Improve performance of plan building in SBE&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/20e995074cf7420ced7e46636ec0a78e2fd0c19f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/20e995074cf7420ced7e46636ec0a78e2fd0c19f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5095591" author="kyle.suarez" created="Fri, 6 Jan 2023 14:36:53 +0000"  >&lt;p&gt;LGTM&lt;/p&gt;</comment>
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