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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36388] inMemory storage engines should not set allowDiskUse for external sorts</title>
                <link>https://jira.mongodb.org/browse/SERVER-36388</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the external sorter is used by foreground index builds and several aggregation stages.  The use of the external sorter ignores whether the storage engine is &quot;in memory&quot;, which means that by default the external sorter will spill to disk even when using an inMemory storage engine.&lt;/p&gt;</description>
                <environment></environment>
        <key id="580772">SERVER-36388</key>
            <summary>inMemory storage engines should not set allowDiskUse for external sorts</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13202">Works as Designed</resolution>
                                        <assignee username="asya.kamsky@mongodb.com">Asya Kamsky</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Wed, 1 Aug 2018 13:50:01 +0000</created>
                <updated>Fri, 27 Oct 2023 13:53:37 +0000</updated>
                            <resolved>Tue, 14 Aug 2018 14:59:01 +0000</resolved>
                                                                    <component>Querying</component>
                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1975379" author="asya" created="Tue, 14 Aug 2018 14:59:01 +0000"  >&lt;p&gt;Closing as I don&apos;t believe we should change this.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="1975377" author="asya" created="Tue, 14 Aug 2018 14:58:38 +0000"  >&lt;p&gt;allowDiskUse is false&#160; &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cfa96795eefed2061628891c43ccdc2c256bb40a/src/mongo/db/pipeline/expression_context.h#L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;by default&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;If the user doesn&apos;t set it they get:&lt;/p&gt;

&lt;p&gt;&quot;errmsg&quot; : &quot;Exceeded memory limit for $group, but didn&apos;t allow external sort. Pass allowDiskUse:true to opt in.&quot;,&lt;/p&gt;

&lt;p&gt;So, if they know their dbpath has space available, I don&apos;t see why they should not be allowed to spill to disk during sort and group.&#160;&#160;&lt;/p&gt;</comment>
                            <comment id="1972570" author="ian@10gen.com" created="Fri, 10 Aug 2018 14:20:18 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt; to first research whether the default for allowDiskUse is true or false and whether it recently changed, then bring back to triage for the Storage team.&lt;/p&gt;</comment>
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