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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-82014] Decide and act on value of explain_remove.js and explain_update.js FSM workloads</title>
                <link>https://jira.mongodb.org/browse/SERVER-82014</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The explain&amp;#95;remove.js and explain&amp;#95;update.js FSM workloads have existed for a while (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16648&quot; title=&quot;Add more FSM-based concurrency tests to parallel suite&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16648&quot;&gt;&lt;del&gt;SERVER-16648&lt;/del&gt;&lt;/a&gt;, MongoDB 3.2) yet haven&apos;t actually been running the &lt;tt&gt;explain&lt;/tt&gt; command for the &lt;tt&gt;delete&lt;/tt&gt; and &lt;tt&gt;update&lt;/tt&gt; commands as intended. This can be observed most recently with &lt;tt&gt;eslint&amp;#45;disable&amp;#45;line&lt;/tt&gt; being applied to ignore the undefined &lt;tt&gt;explain&lt;/tt&gt; variable referenced in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cd749a77bd02a20a3268a41caf52f994da0bb959/jstests/concurrency/fsm_workloads/explain_remove.js#L29-L31&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explainMultiRemove()&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cd749a77bd02a20a3268a41caf52f994da0bb959/jstests/concurrency/fsm_workloads/explain_update.js#L18-L19&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explainBasicUpdate()&lt;/a&gt; $config.state functions.&lt;/p&gt;

&lt;p&gt;The reason the undefined &lt;tt&gt;explain&lt;/tt&gt; variable hasn&apos;t led to a JavaScript error in testing is because the definition for $config.transitions doesn&apos;t include the newly defined $config.state functions to be included in the transition table and so these functions are never called. This is because Object.extend() overwrites the &quot;explain&quot; property with the $super.transitions definition despite the extended FSM workloads intending to preserve the existing transition table except for the &quot;explain&quot; property.&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/cd749a77bd02a20a3268a41caf52f994da0bb959/jstests/concurrency/fsm_workloads/explain_remove.js#L39-L40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/cd749a77bd02a20a3268a41caf52f994da0bb959/jstests/concurrency/fsm_workloads/explain_remove.js#L39-L40&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/cd749a77bd02a20a3268a41caf52f994da0bb959/jstests/concurrency/fsm_workloads/explain_update.js#L67-L68&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/cd749a77bd02a20a3268a41caf52f994da0bb959/jstests/concurrency/fsm_workloads/explain_update.js#L67-L68&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;What was likely intended is reversing the order of the arguments and using Object.merge() to combine the objects instead:&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;$config.transitions = Object.merge(&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;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;super&lt;/span&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;.transitions, {explain: $config.data.assignEqualProbsToTransitions($config.states)});&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;Given these FSM workloads have never been running as intended and we almost surely have coverage elsewhere, it may also be considered acceptable to delete these JavaScript files entirely rather than fix them.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2469998">SERVER-82014</key>
            <summary>Decide and act on value of explain_remove.js and explain_update.js FSM workloads</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>greenerbuild</label>
                            <label>neweng</label>
                    </labels>
                <created>Mon, 9 Oct 2023 18:44:20 +0000</created>
                <updated>Tue, 30 Jan 2024 15:21:17 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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