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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>[SERVER-37672] Re-enable agg fuzzer on debug builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-37672</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Re-enable the fuzzer on Windows DEBUG and Coverage builds.&lt;/p&gt;</description>
                <environment></environment>
        <key id="621833">SERVER-37672</key>
            <summary>Re-enable agg fuzzer on debug builds</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-stm">Backlog - Server Tooling and Methods (STM)</assignee>
                                    <reporter username="robert.guo@mongodb.com">Robert Guo</reporter>
                        <labels>
                    </labels>
                <created>Fri, 19 Oct 2018 19:22:49 +0000</created>
                <updated>Tue, 6 Dec 2022 03:15:18 +0000</updated>
                            <resolved>Wed, 14 Aug 2019 18:35:57 +0000</resolved>
                                                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2371162" author="max.hirschhorn@10gen.com" created="Wed, 14 Aug 2019 18:35:57 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/af98422380e4f78fdf1edac3a6e5cb457bd5d0a6/src/mongo/db/pipeline/document_source_group.cpp#L523-L532&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The $group stage spills all documents to disk when running on a &lt;tt&gt;&amp;#45;&amp;#45;dbg=on&lt;/tt&gt; build&lt;/a&gt;. This is problematic for the aggregation fuzzer because it can lead to documents being processed in a different order than the original document source. Due to commutativity issues in $group&apos;s accumulators, the aggregation fuzzer may therefore see different results based on whether it spilled to disk or not.&lt;/p&gt;

&lt;p&gt;Addressing these kinds of issues (e.g. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37429&quot; title=&quot;$avg of Infinity and null is NaN on debug builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37429&quot;&gt;SERVER-37429&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42616&quot; title=&quot;$stdDev accumulator can return imprecise results when spilling to disk&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42616&quot;&gt;SERVER-42616&lt;/a&gt;) isn&apos;t a priority for the Query team right now. In the future, we could consider adding a mode for the aggregation fuzzer where it compares the behavior between when spilling to disk and when not spilling to disk. Based on conversations with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=charlie.swanson&quot; class=&quot;user-hover&quot; rel=&quot;charlie.swanson&quot;&gt;charlie.swanson&lt;/a&gt;, we would want to do this by introducing a failpoint to enable always spilling to disk so we aren&apos;t implicitly testing this behavior by downloading a &lt;tt&gt;&amp;#45;&amp;#45;dbg=off&lt;/tt&gt; last-stable binary when running multiversion tests on a &lt;tt&gt;&amp;#45;&amp;#45;dbg=on&lt;/tt&gt; builder.&lt;/p&gt;</comment>
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                <issuelinks>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="883162">SERVER-42616</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="621734">SERVER-37668</issuekey>
        </issuelink>
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            <issuekey id="612935">SERVER-37429</issuekey>
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