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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>
    </build-info>


<item>
            <title>[SERVER-63641] Improve SBE multi-planning by choosing which plan to work next based on a priority metric</title>
                <link>https://jira.mongodb.org/browse/SERVER-63641</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This improvement aims to improve performance for queries affected by&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62150&quot; title=&quot;SBE Multiplanning can be slow when suboptimal plan runs first&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62150&quot;&gt;SERVER-62150&lt;/a&gt;. I recommend reviewing related ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62150&quot; title=&quot;SBE Multiplanning can be slow when suboptimal plan runs first&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62150&quot;&gt;SERVER-62150&lt;/a&gt; for context.&lt;/p&gt;

&lt;p&gt;Today, the SBE multi-planner works in the following way. Let&apos;s assume there are &lt;em&gt;n&lt;/em&gt; candidate plans, and they have some arbitrary order. The algorithm, in pseudocode, looks like this:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;maxReads &amp;lt;- internalQueryPlanEvaluationWorksSbe // Defaults to 10,000.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;for (plan in plans) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     numReadsDoneByPlan &amp;lt;- runTrialPeriod(plan, maxReads);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     maxReads &amp;lt;- min(maxReads, numReadsDoneByPlan);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The reads budget for the trial period is initialized to 10,000, the default value for the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8a2f52590d92482624723086b88151c93ee56f1c/src/mongo/db/query/query_knobs.idl#L53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;internalQueryPlanEvaluationWorksSbe&lt;/tt&gt;&lt;/a&gt; query knob. Next, we run the trial period for each plan in turn (without any interleaving or round-robin execution). The trial period for a given plan ends if either 1) the plan reaches EOF, 2) the plan produces its first batch of results, or 3) the reads budget is expended. In cases (1) and (2), the number of reads required to reach either EOF or the first batch of results is returned as &lt;tt&gt;numReadsDoneByPlan&lt;/tt&gt; in the pseudocode above. This becomes the new reads budget, which means that no plan&apos;s trial period is allowed to last longer than that of the previous plan.&lt;/p&gt;

&lt;p&gt;The problem with this approach is that the overall work done during the trial period is very much dependent on the order in which the candidates are trialed. Let&apos;s say there is a bad plan which requires all 10,000 reads during the trial period and a good plan which reaches EOF in 10 reads. If the bad plan runs first, then the total reads during the trial period will be 10,000 + 10 = 10,010. If the good plan runs first, it immediately reduces the reads budget to 10, and the trial period costs just 10 + 10 = 20 reads in total.&lt;/p&gt;

&lt;p&gt;This ticket proposes an alternative algorithm which aims to reduce the average cost of SBE multi-planning. Here is the updated pseudocode:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;maxReads = internalQueryPlanEvaluationWorksSbe // Defaults to 10,000.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;PriorityQueue q&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;q &amp;lt;- all candidates, initialized with the same default priority&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;while (q is not empty) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    planToRun &amp;lt;- q.Pop()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    done, numReadsDoneByPlan, newPriority &amp;lt;- planToRun.GetNext()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    if (not done) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        q.Push(planToRun, newPriority)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    } else {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        maxReads = min(maxReads, numReadsDoneByPlan)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;&#160;&lt;br/&gt;
 Here, the idea is to interleave execution of the candidate plans (which brings the SBE multi-planner a bit closer to the round-robin strategy employed by the classic multi-planner). We call &lt;tt&gt;getNext()&lt;/tt&gt; just&#160;once on whichever plan is currently prioritized. The calculation of the priority is not spelled out in the pseudocode, but I imagine that the highest priority plan is the one which currently has the highest &quot;productivity ratio&quot;: namely, the highest ratio of documents returned so far to storage reads. As in the current SBE multi-planning algorithm, when a plan&apos;s trial period completes, the reads budget is reduced for all plans which remain in the priority queue.&lt;/p&gt;

&lt;p&gt;Credit to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mihai.andrei&quot; class=&quot;user-hover&quot; rel=&quot;mihai.andrei&quot;&gt;mihai.andrei&lt;/a&gt; for proposing this idea!&lt;/p&gt;</description>
                <environment></environment>
        <key id="1983346">SERVER-63641</key>
            <summary>Improve SBE multi-planning by choosing which plan to work next based on a priority metric</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>pm2697-m2</label>
                    </labels>
                <created>Mon, 14 Feb 2022 22:56:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:30 +0000</updated>
                            <resolved>Tue, 28 Feb 2023 10:56:16 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                    <component>Query Execution</component>
                    <component>Query Planning</component>
                                        <votes>0</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="5235822" author="xgen-internal-githook" created="Tue, 28 Feb 2023 10:54:54 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63641&quot; title=&quot;Improve SBE multi-planning by choosing which plan to work next based on a priority metric&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63641&quot;&gt;&lt;del&gt;SERVER-63641&lt;/del&gt;&lt;/a&gt; Use priority queue to sort plans during multiplanning&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d8c5a79107bed46f3a9accefc1da43fd45fa0270&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d8c5a79107bed46f3a9accefc1da43fd45fa0270&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5174582" author="mihai.andrei" created="Tue, 7 Feb 2023 16:13:54 +0000"  >&lt;p&gt;Per offline discussion, assigning this to myself.&lt;/p&gt;</comment>
                            <comment id="4480445" author="JIRAUSER1257467" created="Wed, 13 Apr 2022 15:26:26 +0000"  >&lt;p&gt;Assigning to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=steve.la%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;steve.la@mongodb.com&quot;&gt;steve.la@mongodb.com&lt;/a&gt;&#160; based on this &lt;a href=&quot;https://mongodb.slack.com/archives/G01JEK8K1A9/p1649343668495929&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;slack chat&lt;/a&gt; and changing the priority to P4&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2367987">SERVER-78077</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1983353">SERVER-63642</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1953500">SERVER-62150</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1970971">SERVER-62981</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1983353">SERVER-63642</issuekey>
        </issuelink>
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