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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-70490] Reconsider how we apply overrides for Cost Model Coefficients</title>
                <link>https://jira.mongodb.org/browse/SERVER-70490</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We parse the BSON object for every query we should to do only when the overrides are changed.&lt;/p&gt;

&lt;p&gt;One possible solution it to use CostModelManager to cache overrides, every time the overrides are changed we can cache new coefficients in the CostModelManager object. We don&apos;t need to store coefficient for every overrides only for the last one since there is always just one active overrides object at any time.&lt;/p&gt;

&lt;p&gt;We always apply overrides to the default coefficients, so we can always reset to the defaults just by setting overrides to an empty object, which should be mentioned in the comments and in the docs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2157428">SERVER-70490</key>
            <summary>Reconsider how we apply overrides for Cost Model Coefficients</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="ruoxin.xu@mongodb.com">Ruoxin Xu</assignee>
                                    <reporter username="alexander.ignatyev@mongodb.com">Alexander Ignatyev</reporter>
                        <labels>
                            <label>M5</label>
                    </labels>
                <created>Wed, 12 Oct 2022 09:35:04 +0000</created>
                <updated>Sun, 29 Oct 2023 21:32:00 +0000</updated>
                            <resolved>Fri, 11 Nov 2022 17:06:17 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5003967" author="xgen-internal-githook" created="Wed, 23 Nov 2022 15:09:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70490&quot; title=&quot;Reconsider how we apply overrides for Cost Model Coefficients&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70490&quot;&gt;&lt;del&gt;SERVER-70490&lt;/del&gt;&lt;/a&gt; Update cost model on Mongod startup&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9114c3335f84c500eb767d06b7960eeff2802a56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9114c3335f84c500eb767d06b7960eeff2802a56&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4974822" author="xgen-internal-githook" created="Fri, 11 Nov 2022 17:00:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ruoxin Xu&apos;, &apos;email&apos;: &apos;ruoxin.xu@mongodb.com&apos;, &apos;username&apos;: &apos;RuoxinXu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70490&quot; title=&quot;Reconsider how we apply overrides for Cost Model Coefficients&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70490&quot;&gt;&lt;del&gt;SERVER-70490&lt;/del&gt;&lt;/a&gt; Cache cost model coefficients in CostModelManager&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/61f1123cb16ade2d55ec6460513170e4a270d30c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/61f1123cb16ade2d55ec6460513170e4a270d30c&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2129358">SERVER-69447</issuekey>
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