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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-43578] M/R Agg: Reject mapreduce command sent to mongos with output mode &quot;replace&quot; and sharded: true</title>
                <link>https://jira.mongodb.org/browse/SERVER-43578</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="935810">SERVER-43578</key>
            <summary>M/R Agg: Reject mapreduce command sent to mongos with output mode &quot;replace&quot; and sharded: true</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="mihai.andrei@mongodb.com">Mihai Andrei</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 23 Sep 2019 18:30:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:16:53 +0000</updated>
                            <resolved>Mon, 4 Nov 2019 14:40:29 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2516027" author="nicholas.zolnierz" created="Mon, 4 Nov 2019 14:48:43 +0000"  >&lt;p&gt;I&apos;ve retitled this ticket to make it clear what we did, further work to fail if a user is expecting MR to create a new sharded collection is being tracked in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44318&quot; title=&quot;M/R Agg: Reject MapReduce commands which would create a new sharded collection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44318&quot;&gt;&lt;del&gt;SERVER-44318&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="2515002" author="xgen-internal-githook" created="Fri, 1 Nov 2019 21:47:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Mihai Andrei&apos;, &apos;email&apos;: &apos;mihai.andrei@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43578&quot; title=&quot;M/R Agg: Reject mapreduce command sent to mongos with output mode &amp;quot;replace&amp;quot; and sharded: true&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43578&quot;&gt;&lt;del&gt;SERVER-43578&lt;/del&gt;&lt;/a&gt; M/R Agg: Reject mapreduce command sent to mongos which is expected to drop and re-shard the output collection&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e5340534df81238e454ce7d3afbb7883115f2c53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e5340534df81238e454ce7d3afbb7883115f2c53&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2509077" author="mihai.andrei" created="Wed, 30 Oct 2019 19:57:30 +0000"  >&lt;p&gt;Per in person discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=nicholas.zolnierz&quot; class=&quot;user-hover&quot; rel=&quot;nicholas.zolnierz&quot;&gt;nicholas.zolnierz&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.wahlin&quot; class=&quot;user-hover&quot; rel=&quot;james.wahlin&quot;&gt;james.wahlin&lt;/a&gt;, checking the last two conditions (i.e. output mode merge/reduce against a non-existent collection and output mode merge/reduce against an existing sharded collection with zero documents) is somewhat complicated as it requires you to know during $merge execution that you are executing in the context of a mapReduce command. For now, the scope of this ticket will be to prevent running out.sharded: true in output mode replace on a mongos. I filed another ticket (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44318&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-44318&lt;/a&gt;) to address the other conditions should we want to do so in the future. &lt;/p&gt;</comment>
                            <comment id="2430491" author="esha.maharishi@10gen.com" created="Tue, 24 Sep 2019 13:40:28 +0000"  >&lt;p&gt;Reminder: This check cannot happen on mongos!! &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/biggrin.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
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