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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-85238] In classic_runtime_planner_for_sbe::CachedPlanner implement replanning for find queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-85238</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implement basic replanning algorithm:&lt;/p&gt;

&lt;p&gt;When SBE plan is retrieved from cache, it will go through SBE trial run phase for us to see if replanning is needed.&lt;/p&gt;

&lt;p&gt;Classic runtime planner tracks the number of &#8220;works&#8221; to determine a budget, but SBE tracks &#8220;reads&#8221; instead of &#8220;works&#8221;. Total number of reads, performed by a plan is equal to totalKeysExamined + totalDocsExamined stats.&lt;/p&gt;

&lt;p&gt;SBE trial run uses &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5036f607417cd3d760b40966b7701046b441e702/src/mongo/db/exec/trial_run_tracker.h#L44&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;TrialRunTracker&lt;/a&gt; to track the number of reads and, optionally, a number of documents that have reached a blocking stage.&lt;/p&gt;

&lt;p&gt;We will set read budget for the plan to M * (totalKeysExamined + totalDocsExamined) of the winning plan after the multi-planning, where M is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5036f607417cd3d760b40966b7701046b441e702/src/mongo/db/query/query_knobs.idl#L218&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;internalQueryCacheEvictionRatio&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;We will not track the number of documents that have reached a blocking stage, which is consistent with classic runtime planner behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2546261">SERVER-85238</key>
            <summary>In classic_runtime_planner_for_sbe::CachedPlanner implement replanning for find queries</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="chii.huang@mongodb.com">Chi-I Huang</assignee>
                                    <reporter username="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Jan 2024 13:51:45 +0000</created>
                <updated>Wed, 7 Feb 2024 23:38:03 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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