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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-59700] Add programming support for tracepoints</title>
                <link>https://jira.mongodb.org/browse/SERVER-59700</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The aim is to provide a library that allows adding tracepoints to &lt;tt&gt;mongo&lt;/tt&gt; servers. The primary intent for these tracepoints is to collect timing information (e.g., using &lt;tt&gt;ServiceContext::getFastClockSource&lt;/tt&gt;) for an ongoing operation. The tracepoints must compile to a noop by default, unless requested otherwise at compile time.&lt;/p&gt;

&lt;p&gt;The following is a possible/suggested API design for the tracepoints.&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;
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						&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: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;void&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; someFunction() {&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: 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: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// TracePoint(std::string name, Duration&amp;lt;T&amp;gt; loggingThreshold);&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    auto tp = makeTracepoint(&lt;/span&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;&quot;MyTracepoint&quot;&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;, Milliseconds(100));&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    runOperationA();&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    tp.checkpoint(&lt;/span&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;&quot;Checkpoint 1&quot;&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;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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    runOperationB();&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;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;When enabled, the tracepoint must collect the timestamp at construction and at each checkpoint, and log the timestamps when the lifetime of the tracepoint object exceeds a threshold.&lt;/p&gt;

&lt;p&gt;For example, if running &lt;tt&gt;runOperationA&lt;/tt&gt; and &lt;tt&gt;runOperationB&lt;/tt&gt; takes more than 100 milliseconds, we expect to see a line similar to the following in &lt;tt&gt;mongo&lt;/tt&gt; logs:&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;
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				&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;   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;{ &quot;Tracepoint exceeded its expected lifetime&quot; , &quot;attr&quot;: {&quot;name&quot;: &quot;MyTracepoint&quot;, &quot;constructedAt&quot;: &quot;timestamp&quot;, &quot;destroyedAt&quot;: &quot;timestamp&quot;, &quot;Checkpoint 1&quot;: &quot;timestamp&quot;, &quot;expectedLifetimeMS&quot;: 100, &quot;observedLifetimeMS&quot;: 101} }&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;&lt;b&gt;Acceptance criteria&lt;/b&gt;:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;For the first pass, someone will do a POC timeboxed at 2 story points to answer some of the open questions&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="1864904">SERVER-59700</key>
            <summary>Add programming support for tracepoints</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</assignee>
                                    <reporter username="amirsaman.memaripour@mongodb.com">Amirsaman Memaripour</reporter>
                        <labels>
                            <label>servicearch-q4-2021</label>
                            <label>servicearch-wfbf-day</label>
                    </labels>
                <created>Tue, 31 Aug 2021 21:53:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:49:01 +0000</updated>
                            <resolved>Fri, 7 Jan 2022 17:59:35 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4280809" author="xgen-internal-githook" created="Fri, 7 Jan 2022 17:21:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Amirsaman Memaripour&apos;, &apos;email&apos;: &apos;amirsaman.memaripour@mongodb.com&apos;, &apos;username&apos;: &apos;samanca&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-59700&quot; title=&quot;Add programming support for tracepoints&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59700&quot;&gt;&lt;del&gt;SERVER-59700&lt;/del&gt;&lt;/a&gt; Add programming support for tracepoints&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3f951c777d1002909c6e5cef1a58556e040ebac8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3f951c777d1002909c6e5cef1a58556e040ebac8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4072164" author="matthew.saltz" created="Mon, 20 Sep 2021 17:59:07 +0000"  >&lt;p&gt;Questions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Do we want this to compile out for sure?&lt;/li&gt;
	&lt;li&gt;How to enable/disable?
	&lt;ul&gt;
		&lt;li&gt;At compile time somehow - Maybe only enable in debug mode?&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Do we want an Evergreen variant with these enabled?&lt;/li&gt;
	&lt;li&gt;Able to enable globally or per tracepoint?
	&lt;ul&gt;
		&lt;li&gt;We think just globally&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;Have to be thread safe?&lt;/li&gt;
	&lt;li&gt;How does this compare to &lt;a href=&quot;https://github.com/samanca/mongo/commits/skunkworks20&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Sam&apos;s Skunkworks&lt;/a&gt;?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;API Ideas:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Version that takes a lambda&lt;/li&gt;
	&lt;li&gt;Another version more similar to OpenTelemetry&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="4036200" author="bruce.lucas@10gen.com" created="Thu, 2 Sep 2021 13:02:25 +0000"  >&lt;p&gt;I think ideally the logged message would follow the established convention for reporting the duration by using an attr.durationMillis field. This would allow using tools that expect such a field, which we have found very useful in practice.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1860308">SERVER-59599</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2199284">SERVER-71736</issuekey>
        </issuelink>
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