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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-53657] $group&apos;s executionStats should report the spilled data file size</title>
                <link>https://jira.mongodb.org/browse/SERVER-53657</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;$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="1584367">SERVER-53657</key>
            <summary>$group&apos;s executionStats should report the spilled data file size</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="rishab.joshi@mongodb.com">Rishab Joshi</reporter>
                        <labels>
                            <label>auto-reverted</label>
                            <label>query-offsite</label>
                    </labels>
                <created>Fri, 8 Jan 2021 15:39:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:01 +0000</updated>
                            <resolved>Tue, 6 Dec 2022 11:37:25 +0000</resolved>
                                    <version>4.9.0</version>
                                    <fixVersion>6.2.0-rc0</fixVersion>
                    <fixVersion>6.3.0-rc0</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="5032829" author="xgen-internal-githook" created="Tue, 6 Dec 2022 11:25:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53657&quot; title=&quot;$group&amp;#39;s executionStats should report the spilled data file size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53657&quot;&gt;&lt;del&gt;SERVER-53657&lt;/del&gt;&lt;/a&gt; Add spill file size to execution stats for $group&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/288dd4cd6645f1336e0972324e0ad10226c0ba6b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/288dd4cd6645f1336e0972324e0ad10226c0ba6b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4917520" author="xgen-buildbaron-user" created="Fri, 21 Oct 2022 02:20:09 +0000"  >&lt;p&gt;Ticket re-opened due to revert. &lt;a href=&quot;https://evergreen.mongodb.com/task/mongodb_mongo_master_linux_64_debug_required_aggregation_7cda7dd4df551cb5ff95b0a913b6dbb812320def_22_10_20_14_59_30&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aggregation&lt;/a&gt; began a consistent failure of jstests/aggregation/spill_to_disk.js&lt;/p&gt;</comment>
                            <comment id="4917518" author="xgen-internal-githook" created="Fri, 21 Oct 2022 02:16:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;auto-revert-processor&apos;, &apos;email&apos;: &apos;dev-prod-dag@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53657&quot; title=&quot;$group&amp;#39;s executionStats should report the spilled data file size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53657&quot;&gt;&lt;del&gt;SERVER-53657&lt;/del&gt;&lt;/a&gt; Add &apos;spillFileSizeBytes&apos; and &apos;numBytesSpilledEstimate&apos; to $group execution stats explain output&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 7cda7dd4df551cb5ff95b0a913b6dbb812320def.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fab997bf60ede64f7e5ca78b15a9ad2661e88e6a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fab997bf60ede64f7e5ca78b15a9ad2661e88e6a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4915884" author="xgen-internal-githook" created="Thu, 20 Oct 2022 14:59:34 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@10gen.com&apos;, &apos;username&apos;: &apos;mtandrei&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53657&quot; title=&quot;$group&amp;#39;s executionStats should report the spilled data file size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53657&quot;&gt;&lt;del&gt;SERVER-53657&lt;/del&gt;&lt;/a&gt; Add &apos;spillFileSizeBytes&apos; and  &apos;numBytesSpilledEstimate&apos; to $group execution stats explain output&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7cda7dd4df551cb5ff95b0a913b6dbb812320def&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7cda7dd4df551cb5ff95b0a913b6dbb812320def&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4818082" author="JIRAUSER1259232" created="Mon, 12 Sep 2022 10:00:25 +0000"  >&lt;p&gt;There is another ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67703&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;tracking the sort spills&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="2202191">SERVER-71832</issuekey>
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            <issuekey id="2163370">COMPASS-6217</issuekey>
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            <issuekey id="2163368">DOCS-15697</issuekey>
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                            <issuelinktype id="10012">
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                                        <issuelink>
            <issuekey id="2157692">SERVER-70493</issuekey>
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                            <customfieldvalue>This commit introduces two fields to the execution stats explain output of $group in the classic engine: &lt;br/&gt;
- spillFileSizeBytes, which reports the size of the spill file written to disk&lt;br/&gt;
- numBytesSpilledEstimate, which reports an estimate of the size of $group data evicted from memory as part of spilling&lt;br/&gt;
&lt;br/&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.</customfieldvalue>

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