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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-65319] Adjust statistics counters to the new default value of allowDiskUse</title>
                <link>https://jira.mongodb.org/browse/SERVER-65319</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PM-2742 changes the default of the allowDiskUse per-query parameter and introduces allowDiskUseByDefault per-node parameter. In this context, we might need to adjust the statistics.&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64184&quot; title=&quot;Track usage of allowDiskUse:true in agg command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64184&quot;&gt;&lt;del&gt;SERVER-64184&lt;/del&gt;&lt;/a&gt; added tracking the explicit use of allowDiskUse:true per-query parameter&lt;/li&gt;
	&lt;li&gt;Do we want to continue tracking the explicit use of allowDiskUse:true pas PM-2742? (true will be the new default)&lt;/li&gt;
	&lt;li&gt;Do we want to track the usage with find command as well?&lt;/li&gt;
	&lt;li&gt;Do we want to track the explicit use allowDiskUse:false?&lt;/li&gt;
	&lt;li&gt;Do we want to track both explicit and implicit use?&lt;/li&gt;
	&lt;li&gt;Do we want to track changes of the allowDiskUseByDefault parameter?&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2019079">SERVER-65319</key>
            <summary>Adjust statistics counters to the new default value of allowDiskUse</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="romans.kasperovics@mongodb.com">Romans Kasperovics</assignee>
                                    <reporter username="romans.kasperovics@mongodb.com">Romans Kasperovics</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Apr 2022 07:48:11 +0000</created>
                <updated>Sun, 29 Oct 2023 21:39:53 +0000</updated>
                            <resolved>Mon, 2 May 2022 09:49:44 +0000</resolved>
                                                    <fixVersion>6.0.0-rc4</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4521514" author="xgen-internal-githook" created="Tue, 3 May 2022 01:15:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65319&quot; title=&quot;Adjust statistics counters to the new default value of allowDiskUse&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65319&quot;&gt;&lt;del&gt;SERVER-65319&lt;/del&gt;&lt;/a&gt; Count explicit use of allowDiskUse:false&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f60d59336d13ea6c51cd6d1775188ceb725a4dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f60d59336d13ea6c51cd6d1775188ceb725a4dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4519372" author="xgen-internal-githook" created="Mon, 2 May 2022 09:47:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Romans Kasperovics&apos;, &apos;email&apos;: &apos;romans.kasperovics@mongodb.com&apos;, &apos;username&apos;: &apos;romanskas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65319&quot; title=&quot;Adjust statistics counters to the new default value of allowDiskUse&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65319&quot;&gt;&lt;del&gt;SERVER-65319&lt;/del&gt;&lt;/a&gt; Count explicit use of allowDiskUse:false&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/34ea442dda453616265650377d8d68404195c46f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/34ea442dda453616265650377d8d68404195c46f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4511420" author="david.storch" created="Wed, 27 Apr 2022 21:41:20 +0000"  >&lt;p&gt;Actually, I&apos;m not sure if we quite settled this. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=christopher.harris%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;christopher.harris@mongodb.com&quot;&gt;christopher.harris@mongodb.com&lt;/a&gt; should we be counting only those queries which explicitly pass &lt;tt&gt;allowDiskUse:false&lt;/tt&gt; over the wire? Or should we count those queries plus the ones which do not specify &lt;tt&gt;allowDiskUse&lt;/tt&gt; but inherit a value of &lt;tt&gt;allowDiskUse:false&lt;/tt&gt; because the system is configured with &lt;tt&gt;allowDiskUseByDefault:false&lt;/tt&gt;?&lt;/p&gt;

&lt;p&gt;Originally I was imagining that we would count both the queries which explicitly prohibit disk use and those which disallow disk use by virtue of &quot;inheritance&quot;. But on second thought we may prefer to only count explicit &lt;tt&gt;allowDiskUse:false&lt;/tt&gt;. For one thing, this is likely simpler to implement. But more importantly, I imagine that we are interested in two separate questions:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;How many mongod nodes exist on Atlas which use &lt;tt&gt;allowDiskUseByDefault:false&lt;/tt&gt;?&lt;/li&gt;
	&lt;li&gt;How many queries are run on Atlas (and against how many distinct clusters/projects) which explicitly pass &lt;tt&gt;allowDiskUse:false&lt;/tt&gt;?&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;These seem like related but independent questions. The counter we are adding now would be designed to answer question (2) but could not answer question (1).&lt;/p&gt;</comment>
                            <comment id="4502921" author="JIRAUSER1263745" created="Mon, 25 Apr 2022 10:50:58 +0000"  >&lt;p&gt;To summarise the results of the product triage, for this ticket it is decided to &lt;b&gt;count only the explicit &lt;tt&gt;allowDiskUse:false&lt;/tt&gt; per-query parameters&lt;/b&gt;. This new counter will replace the existing counter for &lt;tt&gt;allowDiskUse:true&lt;/tt&gt; from the version 6.0.0.&lt;/p&gt;</comment>
                            <comment id="4485361" author="david.storch" created="Fri, 15 Apr 2022 13:58:41 +0000"  >&lt;p&gt;Requesting backport to 6.0.&lt;/p&gt;</comment>
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