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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-30669] mapReduce on mongos should pass UUID for sharded output collection in MapReduceFinishCommand to shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-30669</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a sharded output collection specified in a mapReduce command on a cluster, currently the shards will generate their own UUIDs for the collection rather than using the UUID stored on the config server.&lt;/p&gt;

&lt;p&gt;This is because each shard puts its results into a temporary collection (which is created with a self-generated UUID), then renames the temporary collection to the final sharded output collection.&lt;/p&gt;

&lt;p&gt;Instead of letting the shard generate the UUID for the temporary collection itself, a 3.6 mongos should pass the UUID to use as part of the MapReduceFinishCommand. The shard should use this UUID when creating the temp collection.&lt;/p&gt;

&lt;p&gt;A shard in fcv=3.6 should uassert if the UUID is not sent as part of the MapReduceFinishCommand.&lt;/p&gt;</description>
                <environment></environment>
        <key id="416881">SERVER-30669</key>
            <summary>mapReduce on mongos should pass UUID for sharded output collection in MapReduceFinishCommand to shards</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="13201">Fixed</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Aug 2017 20:40:24 +0000</created>
                <updated>Mon, 30 Oct 2023 23:14:18 +0000</updated>
                            <resolved>Tue, 12 Sep 2017 19:30:13 +0000</resolved>
                                    <version>3.5.11</version>
                                    <fixVersion>3.6.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1671120" author="ramon.fernandez" created="Tue, 12 Sep 2017 20:11:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: u&apos;EshaMaharishi&apos;, &apos;name&apos;: u&apos;Esha Maharishi&apos;, &apos;email&apos;: u&apos;esha.maharishi@mongodb.com&apos;}
&lt;p&gt;Message:&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30669&quot; title=&quot;mapReduce on mongos should pass UUID for sharded output collection in MapReduceFinishCommand to shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30669&quot;&gt;&lt;del&gt;SERVER-30669&lt;/del&gt;&lt;/a&gt; mapReduce on mongos should pass UUID for sharded output collection in MapReduceFinishCommand to shards&lt;br/&gt;
Branch:master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/978521eb3926867b30903781fd89d4acd931f0c4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/978521eb3926867b30903781fd89d4acd931f0c4&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="417284">SERVER-30703</issuekey>
        </issuelink>
                            </outwardlinks>
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                            <issuelinktype id="10020">
                    <name>Gantt Dependency</name>
                                            <outwardlinks description="has to be done before">
                                        <issuelink>
            <issuekey id="419026">SERVER-30780</issuekey>
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                                                                <inwardlinks description="has to be done after">
                                        <issuelink>
            <issuekey id="426303">SERVER-31041</issuekey>
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            <issuekey id="417575">SERVER-30713</issuekey>
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