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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-74651] Fix implicit multiversion tests from not running in patches</title>
                <link>https://jira.mongodb.org/browse/SERVER-74651</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implicit multiversion tests are generated as part of the regular burn_in task generation for patches. These tasks are created to test if changing a test file will break it across a variety of different multiversion situations.&lt;/p&gt;

&lt;p&gt;These tasks do not exist as part of the original patch definition. They are generated as part of its lifecycle by version_burn_in_gen on a special variant called &lt;a href=&quot;https://spruce.mongodb.com/variant-history/mongodb-mongo-master/enterprise-rhel-80-64-bit-multiversion-required&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;! Enterprise RHEL 8.0 (implicit multiversion)&lt;/a&gt; that itself does not exist until after the generator has run. The only way to run these tasks currently is to wait until after the version_burn_in_gen task has run and then to reconfigure the patch to include the tasks on that new variant.&#160;&lt;/p&gt;

&lt;p&gt;This means it is very hard to run these tasks and we are lacking multiversion testing coverage in patches. These tests are valuable and we should be running them.&#160;&lt;/p&gt;

&lt;p&gt;A couple of ideas for fixing this&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Special case multiversion burn_in tests and have them activate themselves automatically on every patch&lt;/li&gt;
	&lt;li&gt;Move these tasks to live on a different variant that is present at patch creation time (or make &lt;a href=&quot;https://spruce.mongodb.com/variant-history/mongodb-mongo-master/enterprise-rhel-80-64-bit-multiversion-required&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;! Enterprise RHEL 8.0 (implicit multiversion)&lt;/a&gt; available at creation time). This way people can schedule these tasks much easier.&#160;&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2282216">SERVER-74651</key>
            <summary>Fix implicit multiversion tests from not running in patches</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="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="13202">Works as Designed</resolution>
                                        <assignee username="mikhail.shchatko@mongodb.com">Mikhail Shchatko</assignee>
                                    <reporter username="jeff.zambory@mongodb.com">Jeffrey Zambory</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Mar 2023 19:48:41 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:39 +0000</updated>
                            <resolved>Tue, 28 Mar 2023 14:52:58 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5306093" author="mikhail.shchatko" created="Tue, 28 Mar 2023 14:52:58 +0000"  >&lt;p&gt;I&apos;ve checked how burn-in works at the moment and can say that everything works as expected.&lt;/p&gt;

&lt;p&gt;Here is the patch with the dummy change in one of the js test:&lt;br/&gt;
&lt;a href=&quot;https://spruce.mongodb.com/version/6422dbc42a60ed9895a4b234/tasks?page=0&amp;amp;sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&amp;amp;taskName=burn_in&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://spruce.mongodb.com/version/6422dbc42a60ed9895a4b234/tasks?page=0&amp;amp;sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC&amp;amp;taskName=burn_in&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;To give a more broad explanation the burn-in works in the following way. We have `version_burn_in_gen` task that generates all burn-in related tasks and variant even if no one chose to run them. The way evergreen works, as soon as those tasks/variants are generated, you will be able to see them in `Reconfigure tasks/variants` view in the patch. But it is not expected from users to do that to run those tasks. Instead of that we have `burn_in_tests_gen` and `burn_in_tags_gen` tasks on `! Shared Library Enterprise RHEL 8.0 (all feature flags)` and `! Enterprise Windows (all feature flags)` required variants. `burn_in_tests_gen` task is supposed to activate those generated tasks that appear on the same variant and `burn_in_tags_gen` is doing the same thing for tasks that are generated on a separated newly generated variants, which are `! Enterprise RHEL 8.0 (implicit multiversion)` and `! Enterprise RHEL 8.0 (inMemory)`. That means that `! Enterprise RHEL 8.0 (implicit multiversion)` variant with burn_in will run in case user selects to run a patch with all required variants (of course when the changed js test affects any implicit multiversion task, otherwise it will be no-op).&lt;/p&gt;</comment>
                            <comment id="5253155" author="JIRAUSER1268551" created="Mon, 6 Mar 2023 21:19:11 +0000"  >&lt;p&gt;I also wonder what we could add to catch this kind of thing from happening again? Maybe some data on the amount of tests run? I don&apos;t have a strong preference between solutions here.&lt;/p&gt;</comment>
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