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    <title>MongoDB Jira</title>
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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-36701] Concurrent mapReduce replace with setFCV between 3.4 and 3.6 can cause errors with UUID assignment/removal</title>
                <link>https://jira.mongodb.org/browse/SERVER-36701</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Running a concurrency workload with setFCV toggling between 3.4 and 3.6 and mapReduce replace may cause collection validation to fail the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/56cd2418be38c4aeacdb26f95c48ecae7c4189fd/src/mongo/db/commands/validate.cpp#L212-L229&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;UUID checks&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="589513">SERVER-36701</key>
            <summary>Concurrent mapReduce replace with setFCV between 3.4 and 3.6 can cause errors with UUID assignment/removal</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-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Thu, 16 Aug 2018 19:20:10 +0000</created>
                <updated>Tue, 6 Dec 2022 03:20:46 +0000</updated>
                            <resolved>Mon, 16 Mar 2020 20:18:38 +0000</resolved>
                                    <version>3.6.6</version>
                                                    <component>MapReduce</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2982177" author="connie.chen" created="Mon, 16 Mar 2020 20:18:38 +0000"  >&lt;p&gt;We won&apos;t fix this since its on a stable branch that will be retired soon&lt;/p&gt;</comment>
                            <comment id="1978759" author="maria.vankeulen" created="Fri, 17 Aug 2018 14:59:50 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.maharishi&quot; class=&quot;user-hover&quot; rel=&quot;esha.maharishi&quot;&gt;esha.maharishi&lt;/a&gt;&#160;I believe this issue is distinct from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36447&quot; title=&quot;[3.6] MapReduce uses the output collection&amp;#39;s UUID when creating the temp collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36447&quot;&gt;&lt;del&gt;SERVER-36447&lt;/del&gt;&lt;/a&gt;, since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36447&quot; title=&quot;[3.6] MapReduce uses the output collection&amp;#39;s UUID when creating the temp collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36447&quot;&gt;&lt;del&gt;SERVER-36447&lt;/del&gt;&lt;/a&gt; has to do with reusing UUIDs during collection creation. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36701&quot; title=&quot;Concurrent mapReduce replace with setFCV between 3.4 and 3.6 can cause errors with UUID assignment/removal&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36701&quot;&gt;&lt;del&gt;SERVER-36701&lt;/del&gt;&lt;/a&gt; refers to an issue where a collection has already been created but fails to get assigned a UUID during the UUID assignment procedure.&lt;/p&gt;</comment>
                            <comment id="1978713" author="ian@10gen.com" created="Fri, 17 Aug 2018 14:31:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maria.vankeulen&quot; class=&quot;user-hover&quot; rel=&quot;maria.vankeulen&quot;&gt;maria.vankeulen&lt;/a&gt; to rerun the repro script with $out to see if there could be a similar issue there.&lt;/p&gt;</comment>
                            <comment id="1978711" author="ian@10gen.com" created="Fri, 17 Aug 2018 14:30:20 +0000"  >&lt;p&gt;For 3.6 we will disallow setFCV from running concurrently with all mapreduce &quot;replace&quot;.&lt;/p&gt;</comment>
                            <comment id="1978679" author="esha.maharishi@10gen.com" created="Fri, 17 Aug 2018 14:04:41 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=maria.vankeulen&quot; class=&quot;user-hover&quot; rel=&quot;maria.vankeulen&quot;&gt;maria.vankeulen&lt;/a&gt;, does this have the same root cause as &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36447&quot; title=&quot;[3.6] MapReduce uses the output collection&amp;#39;s UUID when creating the temp collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36447&quot;&gt;&lt;del&gt;SERVER-36447&lt;/del&gt;&lt;/a&gt;?&lt;/p&gt;</comment>
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