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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-31716] mapReduce can create sharded output collection on shards with wrong UUID if drop/recreate called concurrently</title>
                <link>https://jira.mongodb.org/browse/SERVER-31716</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If mapReduce is run with sharded output, mongos &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.0-rc1/src/mongo/s/commands/cluster_map_reduce_cmd.cpp#L486-L488&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sends the UUID for the sharded output collection to the shards as part of the second phase&lt;/a&gt;, so that shards create the collection on themselves with the correct UUID.&lt;/p&gt;

&lt;p&gt;However, there is a window in between when mongos &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.0-rc1/src/mongo/s/commands/cluster_map_reduce_cmd.cpp#L470-L480&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;calls shardCollection on the config server to obtain the UUID&lt;/a&gt; and &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.0-rc1/src/mongo/s/commands/cluster_map_reduce_cmd.cpp#L492-L497&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;takes the distlock itself&lt;/a&gt; in which the output collection can be dropped, recreated, and re-sharded with a different UUID.&lt;/p&gt;

&lt;p&gt;This is the only place mongos tells shards what UUID to use when creating a collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="451076">SERVER-31716</key>
            <summary>mapReduce can create sharded output collection on shards with wrong UUID if drop/recreate called concurrently</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>PM-1017</label>
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                <created>Wed, 25 Oct 2017 18:49:16 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:49 +0000</updated>
                            <resolved>Thu, 23 Jan 2020 14:06:53 +0000</resolved>
                                    <version>3.6.0-rc1</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
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