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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-44527] Map reduce to an existing sharded collection can incorrectly create new collections on target shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-44527</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="994337">SERVER-44527</key>
            <summary>Map reduce to an existing sharded collection can incorrectly create new collections on target shards</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="13201">Fixed</resolution>
                                        <assignee username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                            <label>qopt-team</label>
                    </labels>
                <created>Fri, 8 Nov 2019 20:22:45 +0000</created>
                <updated>Sun, 29 Oct 2023 22:15:08 +0000</updated>
                            <resolved>Fri, 20 Dec 2019 15:15:58 +0000</resolved>
                                    <version>3.6.15</version>
                    <version>4.0.13</version>
                    <version>4.2.1</version>
                    <version>4.2.6</version>
                                    <fixVersion>3.6.17</fixVersion>
                    <fixVersion>4.2.3</fixVersion>
                    <fixVersion>4.3.3</fixVersion>
                    <fixVersion>4.0.15</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2723117" author="xgen-internal-githook" created="Mon, 13 Jan 2020 21:44:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44527&quot; title=&quot;Map reduce to an existing sharded collection can incorrectly create new collections on target shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44527&quot;&gt;&lt;del&gt;SERVER-44527&lt;/del&gt;&lt;/a&gt; Avoid renaming to target collection in mapReduce if the shard does not own any documents&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b4db881a18cbe15127a5a60c971cd393e0621466)&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fa836e4fe1a7b5fc7f94abffa951a2d864069a2f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fa836e4fe1a7b5fc7f94abffa951a2d864069a2f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2718670" author="xgen-internal-githook" created="Fri, 10 Jan 2020 15:31:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44527&quot; title=&quot;Map reduce to an existing sharded collection can incorrectly create new collections on target shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44527&quot;&gt;&lt;del&gt;SERVER-44527&lt;/del&gt;&lt;/a&gt; Avoid renaming to target collection in mapReduce if the shard does not own any documents&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b4db881a18cbe15127a5a60c971cd393e0621466)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/51c0f303a85a1bbb29cec8e18daa27ee6a187811&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/51c0f303a85a1bbb29cec8e18daa27ee6a187811&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2710835" author="xgen-internal-githook" created="Tue, 7 Jan 2020 22:00:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44527&quot; title=&quot;Map reduce to an existing sharded collection can incorrectly create new collections on target shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44527&quot;&gt;&lt;del&gt;SERVER-44527&lt;/del&gt;&lt;/a&gt; Avoid renaming to target collection in mapReduce if the shard does not own any documents&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9a9d2304a75ae944d5f0f4ce2addfccf6733ec21&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9a9d2304a75ae944d5f0f4ce2addfccf6733ec21&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2653525" author="xgen-internal-githook" created="Thu, 19 Dec 2019 21:12:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44527&quot; title=&quot;Map reduce to an existing sharded collection can incorrectly create new collections on target shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44527&quot;&gt;&lt;del&gt;SERVER-44527&lt;/del&gt;&lt;/a&gt; Avoid renaming to target collection in mapReduce if the shard does not own any documents&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b4db881a18cbe15127a5a60c971cd393e0621466&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b4db881a18cbe15127a5a60c971cd393e0621466&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2540898" author="nicholas.zolnierz" created="Thu, 14 Nov 2019 16:27:37 +0000"  >&lt;p&gt;Since we&apos;re planning to keep around the mongod side of MR in PM-766, this should be fixed in 4.3 and back ported to 4.2.&lt;/p&gt;</comment>
                            <comment id="2526131" author="nicholas.zolnierz" created="Fri, 8 Nov 2019 20:52:08 +0000"  >&lt;p&gt;See Esha&apos;s comment &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44477?focusedCommentId=2526058&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-2526058&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;here&lt;/a&gt; for a better explanation of the details, this ticket is tracking issue #2 in that comment.&lt;/p&gt;</comment>
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