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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-41064] Log scoped diagnostic data (e.g. in-progress client command) on invariant</title>
                <link>https://jira.mongodb.org/browse/SERVER-41064</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If an invariant is hit while processing an incoming client command, the command being processed should be logged (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.1.9/src/mongo/db/service_entry_point_common.cpp#L943-L944&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;as it would have been prior to running, if the COMMAND logLevel had been 2 or more&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;This is because by default commands are only logged after they have finished running, but this will never happen if an invariant kills the server midway through the command.  Diagnostically it&apos;s invaluable to know the command (including arguments) that was in progress when the invariant triggered, and it&apos;s common to lament the absence of this info when invariants are hit in the field or in production (because it may not be possible to reproduce, and core dumps are unlikely to be available).&lt;/p&gt;

&lt;p&gt;Desired change:&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: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 2019-05-08T02:25:10.859+0000 F -        [conn216296] Invariant failure params.descriptor src/mongo/db/query/stage_builder.cpp 102&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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+2019-05-08T02:25:10.859+0000 F COMMAND  [conn216296] in-progress command: foo.$cmd { find: &quot;bar&quot;, filter: { ... }, ... }&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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 2019-05-08T02:25:10.859+0000 F -        [conn216296]&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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  &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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; ***aborting after invariant() failure&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;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &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: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; 2019-05-08T02:25:10.912+0000 F -        [conn216296] Got signal: 6 (Aborted).&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;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="761061">SERVER-41064</key>
            <summary>Log scoped diagnostic data (e.g. in-progress client command) on invariant</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="13201">Fixed</resolution>
                                        <assignee username="billy.donahue@mongodb.com">Billy Donahue</assignee>
                                    <reporter username="kevin.pulo@mongodb.com">Kevin Pulo</reporter>
                        <labels>
                            <label>sa-groomed</label>
                    </labels>
                <created>Thu, 9 May 2019 00:37:14 +0000</created>
                <updated>Sun, 29 Oct 2023 22:21:12 +0000</updated>
                            <resolved>Wed, 3 Aug 2022 22:39:39 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Diagnostics</component>
                    <component>Internal Code</component>
                                        <votes>3</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="4727338" author="billy.donahue" created="Wed, 3 Aug 2022 22:46:45 +0000"  >&lt;p&gt;Now we have the `ScopedDebugInfo` utility and the test, but haven&apos;t integrated it with any production code yet.&lt;br/&gt;
So nothing calls it yet, but if they did, those data would be dumped by `invariant` failures.&lt;br/&gt;
So let&apos;s now go back and think of some places where this would be useful and add some ScopedDebugInfo decls.&lt;/p&gt;</comment>
                            <comment id="4727327" author="billy.donahue" created="Wed, 3 Aug 2022 22:41:25 +0000"  >&lt;p&gt;Mongodb CR bot didn&apos;t update the ticket for some reason.&lt;br/&gt;
Master branch commit:&lt;br/&gt;
    &lt;a href=&quot;https://github.com/mongodb/mongo/commit/7c1422f859117ec9e990e5838300b8c281982f9f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7c1422f859117ec9e990e5838300b8c281982f9f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4410977" author="billy.donahue" created="Mon, 14 Mar 2022 18:48:03 +0000"  >&lt;p&gt;The idea at the end of this thread seems pretty useful. I have wished I had something like this before.&lt;br/&gt;
It would have no impact on existing code, other than invariant itself.&lt;/p&gt;

&lt;p&gt;A &lt;tt&gt;thread_local std::vector&amp;lt;ScopeDiagnosticInfo&amp;gt;&lt;/tt&gt;, where &lt;tt&gt;ScopeDiagnosticInfo&lt;/tt&gt; is a TBD lightweight object that can hold some grouping of variant values like &lt;tt&gt;&amp;lt;StringData, int64_t, BSONObj*, Status&amp;gt;&lt;/tt&gt; which together describe a frame, plus a &lt;tt&gt;StringData&lt;/tt&gt; note and a &lt;tt&gt;SourceLocation&lt;/tt&gt; ). It&apos;s essentially a little just-in-case plan for a deferred log statement. This can be read by diagnostic systems like &lt;tt&gt;invariant&lt;/tt&gt; to provide extra context in case a call doesn&apos;t succeed. This would be like adding a little contextual color to stack traces and could be an essential clue for diagnosing failures.&lt;/p&gt;

&lt;p&gt;Mechanically it&apos;s not complex. Maybe 4 ServiceArch story points?&lt;/p&gt;
</comment>
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