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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-63310] Introduce a runtime configurable query knob to disable $group SBE pushdown</title>
                <link>https://jira.mongodb.org/browse/SERVER-63310</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For newly released SBE features, we still kept the feature flags for them. Those feature flags can only be set at startup time and are seldomly used. When customers run into issues with a new feature, the only choice for them to get a quick workaround &lt;b&gt;without downtime&lt;/b&gt; is to disable the whole SBE engine via the internalQueryForceClassicEngine query knob. We should convert those startup-time-only feature flags to runtime-tunable query knobs so customers can disable only a feature, not the entire engine.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=joe.sack&quot; class=&quot;user-hover&quot; rel=&quot;joe.sack&quot;&gt;joe.sack&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=steve.la&quot; class=&quot;user-hover&quot; rel=&quot;steve.la&quot;&gt;steve.la&lt;/a&gt; &lt;del&gt;Currently, feature flags are created for almost all the projects and they are designed to be startup-time-tunable only. I wonder if we can just change the feature flag to be all runtime-tunable so this works perfectly with our existing process and don&apos;t require an extra policy.&lt;/del&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1977634">SERVER-63310</key>
            <summary>Introduce a runtime configurable query knob to disable $group SBE pushdown</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="3">Duplicate</resolution>
                                        <assignee username="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="ethan.zhang@mongodb.com">Ethan Zhang</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Feb 2022 17:24:56 +0000</created>
                <updated>Tue, 12 Apr 2022 17:51:34 +0000</updated>
                            <resolved>Tue, 12 Apr 2022 17:51:34 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4336542" author="JIRAUSER1257640" created="Fri, 4 Feb 2022 17:33:31 +0000"  >&lt;p&gt;Based on the design doc linked in this Jira ticket:&lt;br/&gt;
Feature flags should generally be settable at server startup only. This supports the use of feature flags as a release/development tool and should not impose an unnecessary burden on server administration.&lt;br/&gt;
Also,&#160;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=christopher.harris&quot; class=&quot;user-hover&quot; rel=&quot;christopher.harris&quot;&gt;christopher.harris&lt;/a&gt;&#160;mentioned that, in Atlas, any parameter change even dynamic is done via a restart to make sure it is persistent. So having this query knob will not benefit Atlas users in terms of saving downtime. But it will help the on-prem customers.&lt;/p&gt;</comment>
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            <issuekey id="2019495">SERVER-65338</issuekey>
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