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    <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>[COMPASS-6217] Investigate changes in SERVER-53657: $group&apos;s executionStats should report the spilled data file size</title>
                <link>https://jira.mongodb.org/browse/COMPASS-6217</link>
                <project id="13182" key="COMPASS">Compass </project>
                    <description>    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Original Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;/div&gt;
&lt;p&gt;    This commit introduces two fields to the execution stats explain output of $group in the classic engine: &lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;spillFileSizeBytes, which reports the size of the spill file written to disk&lt;/li&gt;
	&lt;li&gt;numBytesSpilledEstimate, which reports an estimate of the size of $group data evicted from memory as part of spilling&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note that these are not the same quantity, typically, spillFileSizeBytes will be less than numBytesSpilledEstimate because the buffer will be compressed before being written to disk.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    $group&apos;s executionStats should expose a stats &quot;&lt;b&gt;spillFileSizeBytes&lt;/b&gt;&quot;. This stat should report the maximum files size bytes that was written to disk in bytes. This stat will help in better planning/recommendation on disk usage and maybe I/O capacity planning.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="2163370">COMPASS-6217</key>
            <summary>Investigate changes in SERVER-53657: $group&apos;s executionStats should report the spilled data file size</summary>
                <type id="10501" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Investigation</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="9">Done</resolution>
                                        <assignee username="anna.henningsen@mongodb.com">Anna Henningsen</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
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                <created>Thu, 20 Oct 2022 15:49:41 +0000</created>
                <updated>Mon, 28 Nov 2022 01:42:56 +0000</updated>
                            <resolved>Mon, 28 Nov 2022 01:42:56 +0000</resolved>
                                                    <fixVersion>No version</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5009906" author="JIRAUSER1256529" created="Mon, 28 Nov 2022 01:42:56 +0000"  >&lt;p&gt;No devtools impact.&lt;/p&gt;</comment>
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