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    <title>MongoDB Jira</title>
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    <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-42916] M/R Agg: Reject non-inline mapReduce to an existing sharded collection that is not sharded by _id</title>
                <link>https://jira.mongodb.org/browse/SERVER-42916</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the current mapReduce implementation, there is nothing in place to explicitly reject merging to an existing sharded collection whose shard key is not {_id: 1}. However, since it uses &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/dbhelpers.cpp#L211-L230&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this upsert helper&lt;/a&gt; which always targets by _id, the command will eventually fail. We should keep this behavior in 4.4.&lt;/p&gt;</description>
                <environment></environment>
        <key id="901151">SERVER-42916</key>
            <summary>M/R Agg: Reject non-inline mapReduce to an existing sharded collection that is not sharded by _id</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="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Aug 2019 15:16:30 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:54 +0000</updated>
                            <resolved>Thu, 17 Oct 2019 15:54:19 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2486946" author="xgen-internal-githook" created="Thu, 17 Oct 2019 15:29:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Nicholas Zolnierz&apos;, &apos;username&apos;: &apos;nzolnierzmdb&apos;, &apos;email&apos;: &apos;nicholas.zolnierz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42916&quot; title=&quot;M/R Agg: Reject non-inline mapReduce to an existing sharded collection that is not sharded by _id&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42916&quot;&gt;&lt;del&gt;SERVER-42916&lt;/del&gt;&lt;/a&gt; Reject non-inline mapReduce to an existing sharded collection that is not sharded by _id&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4d3270268d55c3f4839b8944a4d3eb47543e0fd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4d3270268d55c3f4839b8944a4d3eb47543e0fd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2476606" author="nicholas.zolnierz" created="Thu, 10 Oct 2019 21:22:09 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=asya&quot; class=&quot;user-hover&quot; rel=&quot;asya&quot;&gt;asya&lt;/a&gt; clarified! Should be relevant for everything other than inline. Planning to add a nice error message instead of something like &quot;MR target collection is not allowed to be sharded&quot;. &lt;/p&gt;</comment>
                            <comment id="2476590" author="asya" created="Thu, 10 Oct 2019 21:17:20 +0000"  >&lt;p&gt;you mean reject &lt;b&gt;merge&lt;/b&gt; into existing sharded collection, right?&lt;/p&gt;</comment>
                            <comment id="2466211" author="nicholas.zolnierz" created="Fri, 4 Oct 2019 14:11:13 +0000"  >&lt;p&gt;Yeah that&apos;s right, I was imagining we would support whatever $merge currently supports. &lt;/p&gt;</comment>
                            <comment id="2466115" author="charlie.swanson" created="Fri, 4 Oct 2019 13:42:10 +0000"  >&lt;p&gt;To be clear, this means we will support {_id: &quot;hashed&quot;}, correct? It&apos;s just that it can&apos;t be sharded by something like value or a field which doesn&apos;t exist?&lt;/p&gt;</comment>
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            <issuekey id="901722">SERVER-42942</issuekey>
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            <issuekey id="959152">SERVER-43829</issuekey>
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