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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-77736] Add concurrency test to stress concurrency of $queryStats running concurrently with queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-77736</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;There is some code to lock one partition, compute everything we need from it, then release the partition lock. It all looks fine on inspection, but we&apos;ve seen some suspicious build failures in one of &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=naama.bareket%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;naama.bareket@mongodb.com&quot;&gt;naama.bareket@mongodb.com&lt;/a&gt;&apos;s patches, and an explicit test of this memory management and concurrency control would help us feel better.&lt;/p&gt;

&lt;p&gt;Broadly, the test should have:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Many threads doing queries
	&lt;ul&gt;
		&lt;li&gt;Some repeat queries that would modify existing entries in the query stats store (incrementing metrics and changing timestamps)&lt;/li&gt;
		&lt;li&gt;Some novel queries adding to the query stats store. Ideally enough that by the end of the workload we see some eviction logic kicking in (can be confirmed in serverStatus.metrics.queryStats output)&lt;/li&gt;
		&lt;li&gt;Some finds, some aggregates, to make sure the two codepaths are both handled correctly&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;At least one thread or maybe a couple doing $queryStats, some with &quot;transformIdentifiers&quot;, some without.
	&lt;ul&gt;
		&lt;li&gt;It would be good to have a very small batch size like 1 or 2 to ensure that the getMore loop doesn&apos;t introduce bugs.&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2357036">SERVER-77736</key>
            <summary>Add concurrency test to stress concurrency of $queryStats running concurrently with queries</summary>
                <type id="17000" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14713&amp;avatarType=issuetype">Engineering Test</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="naama.bareket@mongodb.com">Naama Bareket</assignee>
                                    <reporter username="charlie.swanson@mongodb.com">Charlie Swanson</reporter>
                        <labels>
                    </labels>
                <created>Fri, 2 Jun 2023 15:02:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:20:32 +0000</updated>
                            <resolved>Fri, 16 Jun 2023 12:48:31 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5503663" author="xgen-internal-githook" created="Fri, 16 Jun 2023 00:14:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Naama Bareket&apos;, &apos;email&apos;: &apos;naama.bareket@mongodb.com&apos;, &apos;username&apos;: &apos;naama-bareket&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77736&quot; title=&quot;Add concurrency test to stress concurrency of $queryStats running concurrently with queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77736&quot;&gt;&lt;del&gt;SERVER-77736&lt;/del&gt;&lt;/a&gt;: Add concurrency test to stress concurrency of $queryStats running concurrently with queries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/49687fd45f2e6c65393c9fa9e48db86000d0fe9d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/49687fd45f2e6c65393c9fa9e48db86000d0fe9d&lt;/a&gt;&lt;/p&gt;</comment>
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