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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-63208] Make allowDiskUse opt-out rather than opt-in</title>
                <link>https://jira.mongodb.org/browse/SERVER-63208</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, mongodb queries run with &apos;allowDiskUse&apos; set to false by default. This causes queries to fail when a blocking operator exceeds a certain memory limit, rather than spilling to disk.&lt;/p&gt;

&lt;p&gt;It would make more sense to have &apos;allowDiskUse&apos; be opt-out (default=true) rather than opt-in. This would require a number of changes, not just in the server, but also in atlas (for example, on the free tier we&apos;d probably want to continue to disable spilling altogether).&lt;/p&gt;

&lt;p&gt;This ticket is meant to track the discussion around switching the default of allowDiskUse.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1975819">SERVER-63208</key>
            <summary>Make allowDiskUse opt-out rather than opt-in</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Feb 2022 14:32:28 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:15 +0000</updated>
                            <resolved>Tue, 12 Apr 2022 23:03:56 +0000</resolved>
                                                    <fixVersion>6.0.0-rc0</fixVersion>
                                                        <votes>1</votes>
                                    <watches>17</watches>
                                                                                                                <comments>
                            <comment id="4478734" author="xgen-internal-githook" created="Tue, 12 Apr 2022 22:54:35 +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-63208&quot; title=&quot;Make allowDiskUse opt-out rather than opt-in&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63208&quot;&gt;&lt;del&gt;SERVER-63208&lt;/del&gt;&lt;/a&gt; Make allowDiskUse opt-out rather than opt-in&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f285f0af3d8d1448db1abafcaf4506a96af9e511&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f285f0af3d8d1448db1abafcaf4506a96af9e511&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4464289" author="xgen-internal-githook" created="Thu, 7 Apr 2022 14:17:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mindaugas Malinauskas&apos;, &apos;email&apos;: &apos;mindaugas.malinauskas@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63208&quot; title=&quot;Make allowDiskUse opt-out rather than opt-in&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63208&quot;&gt;&lt;del&gt;SERVER-63208&lt;/del&gt;&lt;/a&gt; Make allowDiskUse opt-out rather than opt-in&lt;/p&gt;

&lt;p&gt;Co-authored-by: David Storch &amp;lt;dstorch@users.noreply.github.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/2a3f0fef833e6db6792e7b0cfadfdc0b3b64d2f4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/2a3f0fef833e6db6792e7b0cfadfdc0b3b64d2f4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4333259" author="david.storch" created="Thu, 3 Feb 2022 15:19:30 +0000"  >&lt;p&gt;The other related idea that came up while we were discussion this was to add the ability to set a cluster-wide default for &lt;tt&gt;allowDiskUse&lt;/tt&gt;, which could then be overridden by specifying &lt;tt&gt;allowDiskUse&lt;/tt&gt; on a per-query basis. This would allow users to get &lt;tt&gt;allowDiskUse=true&lt;/tt&gt; by default without changing the behavior of pre-existing applications.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2023787">DOCS-15236</issuekey>
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            <issuekey id="2030976">SERVER-65888</issuekey>
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            <issuelink>
            <issuekey id="2056691">SERVER-66830</issuekey>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2022640">SERVER-65467</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2361099">SERVER-77866</issuekey>
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                            <customfieldvalue>Downstream teams should have already been notified about this change on PM-2742, but we are erring on the side of over-communicating the change.&lt;br/&gt;
&lt;br/&gt;
As of 6.0.0-rc0, the server will permit spilling to disk during query execution by default. If users want to explicitly prohibit disk use, they can pass {{allowDiskUse:false}} alongside {{find}} or {{aggregate}} commands.&lt;br/&gt;
&lt;br/&gt;
This project also introduces a new {{setParameter}} called {{allowDiskUseByDefault}}. This parameter applies only to mongod, not to mongos. As in previous versions, query execution on mongos will never spill to disk. The default value of {{allowDiskUseByDefault}} is true. Operators can switch this parameter to false at startup or runtime on a per-node basis in order to restore the pre-6.0 behavior of prohibiting spilling to disk by default.&lt;br/&gt;
&lt;br/&gt;
In addition to find and aggregate operations, mapReduce commands, count commands against a view, and distinct commands against a view will respect the value of the {{allowDiskUseByDefault}} parameter.</customfieldvalue>

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