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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-36447] [3.6] MapReduce uses the output collection&apos;s UUID when creating the temp collection</title>
                <link>https://jira.mongodb.org/browse/SERVER-36447</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a mapReduce runs in FCV 3.4, the temp collection will automatically pick up the collection options from the out collection, if the out collection exists. If we&apos;re running concurrent mapReduces, the out collection has a chance to exist. Take this scenario:&lt;/p&gt;

&lt;p&gt;Steps to reproduce (sequentially):&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;MapReduce 1 creates an out collection &quot;xyz&quot; with a generated UUID &quot;a.&quot;&lt;/li&gt;
	&lt;li&gt;MapReduce 2 (same in/out) creates a temp collection that uses the same UUID &quot;a&quot; picked up from the now-existing &quot;xyz.&quot;&lt;/li&gt;
	&lt;li&gt;The out collection &quot;xyz&quot; gets dropped.&lt;/li&gt;
	&lt;li&gt;MapReduce 2 renames the temp collection to &quot;xyz.&quot; It will have the same UUID &quot;a.&quot;&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We should not be propagating UUIDs in this fashion.&lt;/p&gt;

&lt;p&gt;The relevant code is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c8832428acc6804d0c23645e6026cd4d413da6be/src/mongo/db/commands/mr.cpp#L507&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="583325">SERVER-36447</key>
            <summary>[3.6] MapReduce uses the output collection&apos;s UUID when creating the temp collection</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                    </labels>
                <created>Fri, 3 Aug 2018 20:23:11 +0000</created>
                <updated>Tue, 6 Dec 2022 03:22:14 +0000</updated>
                            <resolved>Mon, 25 Mar 2019 15:55:38 +0000</resolved>
                                    <version>3.6.0</version>
                                                    <component>Catalog</component>
                    <component>MapReduce</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
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            <issuekey id="589513">SERVER-36701</issuekey>
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