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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-62086] Update HashAggStage&apos;s default maximum memory usage to the bigger value comparable to the DocumentSourceGroup&apos;s</title>
                <link>https://jira.mongodb.org/browse/SERVER-62086</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Here are investigation results for BF-23718:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;They are the same issue which is related to the new SBE spilling behavior&lt;/li&gt;
	&lt;li&gt;The pipeline in both issues has $group stage on $obj.str group-by key in which all documents has different values and number of documents is 200. The HashAgg checks whether the estimated memory usage is over the allowed maximum memory usage per every 100 groups. So, at the 200th group, the HashAgg realizes that the memory usage over the configured value and errors out when allowDiskUse is off.&lt;/li&gt;
	&lt;li&gt;Then why doesn&#8217;t mongod-5.0 fail? Because we take the classic engine&#160;&lt;tt&gt;DocumentSourceGroup&lt;/tt&gt;&#8217;s code path at mongod-5.0 and the default maximum memory usage is 100 * 1024 * 1024 (==100MB). But in SBE&#160;&lt;tt&gt;HashAggStage&lt;/tt&gt;, the default maximum memory usage is 1024 * 1024.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;&lt;tt&gt;DocumentSourceGroup&lt;/tt&gt;&#8217;s default maximum memory usage:&lt;br/&gt;
 &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/query/query_knobs.idl#L330-L338&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/query/query_knobs.idl#L330-L338&lt;/a&gt;&lt;br/&gt;
 &lt;tt&gt;HashAggStage&lt;/tt&gt;&#8217;s default maximum memory usage:&lt;br/&gt;
 &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/query/query_knobs.idl#L527-L536&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/query/query_knobs.idl#L527-L536&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;So, my recommendation is to update&#160;&lt;tt&gt;HashAggStage&lt;/tt&gt;&#8217;s default maximum memory usage to 100 * 1024 * 1024.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1951701">SERVER-62086</key>
            <summary>Update HashAggStage&apos;s default maximum memory usage to the bigger value comparable to the DocumentSourceGroup&apos;s</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="yoonsoo.kim@mongodb.com">Yoon Soo Kim</assignee>
                                    <reporter username="yoonsoo.kim@mongodb.com">Yoon Soo Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Dec 2021 05:41:45 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:58 +0000</updated>
                            <resolved>Thu, 16 Dec 2021 22:14:25 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                    <fixVersion>5.2.0-rc2</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4255401" author="xgen-internal-githook" created="Fri, 17 Dec 2021 03:19:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62086&quot; title=&quot;Update HashAggStage&amp;#39;s default maximum memory usage to the bigger value comparable to the DocumentSourceGroup&amp;#39;s&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62086&quot;&gt;&lt;del&gt;SERVER-62086&lt;/del&gt;&lt;/a&gt; Increase `HashAggStage`&apos;s maximum allowed memory usage before spill&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/51cba4e2277ba895127f13bf7098fc29fc72c2cd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/51cba4e2277ba895127f13bf7098fc29fc72c2cd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4255036" author="xgen-internal-githook" created="Thu, 16 Dec 2021 21:55:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Yoonsoo Kim&apos;, &apos;email&apos;: &apos;yoonsoo.kim@mongodb.com&apos;, &apos;username&apos;: &apos;yun-soo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62086&quot; title=&quot;Update HashAggStage&amp;#39;s default maximum memory usage to the bigger value comparable to the DocumentSourceGroup&amp;#39;s&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62086&quot;&gt;&lt;del&gt;SERVER-62086&lt;/del&gt;&lt;/a&gt; Increase `HashAggStage`&apos;s maximum allowed memory usage before spill&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/298f70be324278def91cd5350a358cf3405146bc&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/298f70be324278def91cd5350a358cf3405146bc&lt;/a&gt;&lt;/p&gt;</comment>
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