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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-38471] Concurrent mapReduce to same output sharded collection can trigger invariant</title>
                <link>https://jira.mongodb.org/browse/SERVER-38471</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Normal mapReduce finish flow:&lt;/p&gt;

&lt;p&gt;1. shardCollection is run on outputColl. outputColl is created in the shard with UUIDA. UUIDFinal is stored in config.collections for outputColl.&lt;br/&gt;
2. mapReduce finish is sent to shard with UUIDFinal. Shard creates tempColl with UUIDFinal and outputs results to tempColl.&lt;br/&gt;
3. outputColl (created at step#1) is dropped.&lt;br/&gt;
4. tempColl is renamed to outputColl.&lt;/p&gt;

&lt;p&gt;Case that will trigger invariant:&lt;br/&gt;
1. mr1 runs shardColl on outputColl. outputColl is created in the shard with UUIDA. UUIDFinal is stored in config.collections for outputColl.&lt;br/&gt;
2. mr2 runs shardColl on outputColl. outputColl is already sharded with UUIDFinal.&lt;br/&gt;
3. mr1 sends mapReduce finish to shard. tempColl1 gets created with UUIDFinal and becomes outputColl.&lt;br/&gt;
4. mr2 sends mapReduce finish to shard. tempColl2 gets created with UUIDFinal (which has the same UUID as outputColl because of step#3!).&lt;br/&gt;
5. mr2 drops outputColl which removes UUIDFinal from UUIDCatalog.&lt;br/&gt;
6. mr2 tries to rename tempColl2 to outputColl but can&apos;t find UUIDFinal from the catalog and triggers invariant.&lt;/p&gt;</description>
                <environment></environment>
        <key id="647740">SERVER-38471</key>
            <summary>Concurrent mapReduce to same output sharded collection can trigger invariant</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-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Dec 2018 22:04:31 +0000</created>
                <updated>Tue, 6 Dec 2022 03:11:12 +0000</updated>
                            <resolved>Fri, 21 Dec 2018 15:52:37 +0000</resolved>
                                    <version>4.1.6</version>
                                                    <component>MapReduce</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
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