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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-70996] Add serverStatus reporting for query analysis</title>
                <link>https://jira.mongodb.org/browse/SERVER-70996</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;From the design:&lt;/p&gt;

&lt;p&gt;The serverStatus command response on mongos and mongod will include a &#8220;queryAnalyzers&#8221; section with the following diagnostics:&lt;/p&gt;
&lt;p/&gt;
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					&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;{&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;    activeCollections: &amp;lt;integer&amp;gt;, // On a shared cluster, this is a mongos-only field since shardsvr mongods don&#8217;t know about sample rates.  &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;    totalCollections: &amp;lt;integer&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;    totalSampledReadsCount: &amp;lt;integer&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;    totalSampledWritesCount: &amp;lt;integer&amp;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;    totalSampledReadsBytes: &amp;lt;integer&amp;gt;,&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="2171715">SERVER-70996</key>
            <summary>Add serverStatus reporting for query analysis</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="13201">Fixed</resolution>
                                        <assignee username="israel.hsu@mongodb.com">Israel Hsu</assignee>
                                    <reporter username="cheahuychou.mao@mongodb.com">Cheahuychou Mao</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Nov 2022 14:41:59 +0000</created>
                <updated>Sun, 29 Oct 2023 21:31:12 +0000</updated>
                            <resolved>Thu, 9 Mar 2023 05:20:17 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5260552" author="xgen-internal-githook" created="Thu, 9 Mar 2023 05:05:09 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Israel Hsu&apos;, &apos;email&apos;: &apos;israel.hsu@mongodb.com&apos;, &apos;username&apos;: &apos;israelhsu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-70996&quot; title=&quot;Add serverStatus reporting for query analysis&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-70996&quot;&gt;&lt;del&gt;SERVER-70996&lt;/del&gt;&lt;/a&gt; Add serverStatus reporting for query analysis, reorg QueryAnalysis sample counting&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b99e24bf230cb1b22b1b8df3f485438ca3ef911&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b99e24bf230cb1b22b1b8df3f485438ca3ef911&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5222788" author="JIRAUSER1262333" created="Wed, 22 Feb 2023 21:18:20 +0000"  >&lt;p&gt;As per discussion with Chou last week:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Renamed the existing &lt;tt&gt;SampleCounters&lt;/tt&gt; to &lt;tt&gt;CollectionSampleCounters&lt;/tt&gt; and moved it to a class within the new &lt;tt&gt;QueryAnalysisSampleCounters&lt;/tt&gt; class; &lt;tt&gt;CollectionSampleCounters&lt;/tt&gt; also caches the per-collection sample rate for reporting by mongos.&lt;/li&gt;
	&lt;li&gt;The global instance of &lt;tt&gt;QueryAnalysisSampleCounters&lt;/tt&gt; is a decoration of &lt;tt&gt;ServiceContext&lt;/tt&gt; and it is called on by both &lt;tt&gt;QueryAnalysisWriter&lt;/tt&gt; and &lt;tt&gt;QueryAnalysisSampler&lt;/tt&gt;. &lt;tt&gt;QueryAnalysisSampleCounters&lt;/tt&gt; contains a map of &lt;tt&gt;CollectionSampleCounters&lt;/tt&gt; indexed by collection namespace strings, and state for server-level counting of samples and sample sizes.&lt;/li&gt;
	&lt;li&gt;$currentOp and ServerStatus reports are generated by calls to the global {{QueryAnalysisSampleCounters }}instance.&lt;/li&gt;
	&lt;li&gt;Created BSON documents for the reports in &lt;tt&gt;analyze_shard_key_common.idl&lt;/tt&gt;.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="5202426" author="JIRAUSER1262333" created="Wed, 15 Feb 2023 22:58:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cheahuychou.mao%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;cheahuychou.mao@mongodb.com&quot;&gt;cheahuychou.mao@mongodb.com&lt;/a&gt; This is my current thinking on this server-wide counting:&lt;/p&gt;

&lt;p&gt;Rename the existing &lt;tt&gt;SampleCounters&lt;/tt&gt; to &lt;tt&gt;CollectionSampleCounters&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;I&apos;d like to avoid having the calling code have to invoke an &lt;tt&gt;increment()&lt;/tt&gt; function for both a collection-level counter and a server-level counter. I propose having a new object called &lt;tt&gt;SampleCounters&lt;/tt&gt; that maintains both server-level and collection-level counters; it contains a map of the &lt;tt&gt;CollectionSampleCounters&lt;/tt&gt; indexed by collection UUID. The new &lt;tt&gt;SampleCounters&lt;/tt&gt; would contain all the logic to generate serverStatus section and the $currentOp reports. &lt;tt&gt;CollectionSampleCounters&lt;/tt&gt; would be abstracted away from the POV of &lt;tt&gt;QueryAnalysisWriter&lt;/tt&gt; and &lt;tt&gt;QueryAnalysisSampler&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Both &lt;tt&gt;QueryAnalysisSampler&lt;/tt&gt; and &lt;tt&gt;QueryAnalysisWriter&lt;/tt&gt; would have an instance of the new &lt;tt&gt;SampleCounters&lt;/tt&gt;. When they need to count, they invoke &lt;tt&gt;SampleCounters::incrementRead(ns, collUuid, size)&lt;/tt&gt; where &lt;tt&gt;size&lt;/tt&gt; is boost::optional.&lt;/p&gt;

&lt;p&gt;Thoughts?&lt;/p&gt;</comment>
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            <issuekey id="2171721">SERVER-70997</issuekey>
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