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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>[DOCS-11731] Docs for SERVER-33538: mapReduce &quot;replace&quot; on a sharded output collection can lead to UUIDCatalog inconsistencies</title>
                <link>https://jira.mongodb.org/browse/DOCS-11731</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description:&lt;/h2&gt;

&lt;p&gt;If the out field for mapReduce has &apos;sharded: true&apos;, the output collection cannot be an existing unsharded collection. We fail the mapReduce command in this case.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%3A&quot;&gt;&lt;/a&gt;Scope of changes:&lt;/h2&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/mapReduce/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/command/mapReduce/index.html&lt;/a&gt; &#8211; add a note to the section that describes the &quot;sharded&quot; parameter in the out stage/&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/method/db.collection.mapReduce/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/method/db.collection.mapReduce/index.html&lt;/a&gt; &#8211; ditto&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;clarify: core/map-reduce-sharded-collections.html&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct%3A&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%3A&quot;&gt;&lt;/a&gt;MVP:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%3A&quot;&gt;&lt;/a&gt;Resources:&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h2&gt;

&lt;p&gt;mapReduce with a sharded output collection &lt;a href=&quot;https://github.com/mongodb/mongo/blob/de6ceb82f5b554f16517295adfd39c8bfd407926/src/mongo/db/commands/mr.cpp#L512-L520&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;assigns the UUID&lt;/a&gt; obtained from the config server to the final output collection. mapReduce &quot;replace&quot; will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.5/src/mongo/db/commands/mr.cpp#L681-L682&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drop&lt;/a&gt; the existing output collection, which has the same UUID as the new output collection. Two-phase-drop may cause the dropCollection to finish after the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.5/src/mongo/db/commands/mr.cpp#L685-L689&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;renameCollection&lt;/a&gt; finishes, erroneously removing the UUIDCatalog entry for the output collection.&lt;/p&gt;</description>
                <environment></environment>
        <key id="548841">DOCS-11731</key>
            <summary>Docs for SERVER-33538: mapReduce &quot;replace&quot; on a sharded output collection can lead to UUIDCatalog inconsistencies</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="sue.kerschbaumer@mongodb.com">Susan Kerschbaumer</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 May 2018 02:02:46 +0000</created>
                <updated>Sun, 29 Oct 2023 13:57:48 +0000</updated>
                            <resolved>Tue, 17 Jul 2018 20:06:04 +0000</resolved>
                                                    <fixVersion>4.0.0-rc1</fixVersion>
                    <fixVersion>3.6.6</fixVersion>
                    <fixVersion>4.1.1</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1949561" author="xgen-internal-githook" created="Tue, 17 Jul 2018 20:05:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;skerschb&apos;, &apos;name&apos;: &apos;skerschb&apos;, &apos;email&apos;: &apos;sue.kerschbaumer@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11731&quot; title=&quot;Docs for SERVER-33538: mapReduce &amp;quot;replace&amp;quot; on a sharded output collection can lead to UUIDCatalog inconsistencies&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11731&quot;&gt;&lt;del&gt;DOCS-11731&lt;/del&gt;&lt;/a&gt;: backport for 3.6.6 (mapreduce and sharded output collection)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/fafb9e531305f629ceae2a254500cd2c3b792d21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/fafb9e531305f629ceae2a254500cd2c3b792d21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1930573" author="xgen-internal-githook" created="Mon, 25 Jun 2018 15:30:23 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;skerschb&apos;, &apos;name&apos;: &apos;skerschb&apos;, &apos;email&apos;: &apos;sue.kerschbaumer@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-11731&quot; title=&quot;Docs for SERVER-33538: mapReduce &amp;quot;replace&amp;quot; on a sharded output collection can lead to UUIDCatalog inconsistencies&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-11731&quot;&gt;&lt;del&gt;DOCS-11731&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/16c2094674cc707533f926aa38142f57cca89700&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/16c2094674cc707533f926aa38142f57cca89700&lt;/a&gt;&lt;/p&gt;</comment>
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