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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-79582] Remove HostTypeRequirement::kPrimaryShard from $merge</title>
                <link>https://jira.mongodb.org/browse/SERVER-79582</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Use kNone instead of kPrimaryShard. Change distributedPlanLogic() such that we indicate which shard the $merge should execute on in the case that a single shard owns all the data.&lt;/p&gt;

&lt;p&gt;Test cases:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Input and output collections unsharded but reside on two different non-primary shards&lt;/li&gt;
	&lt;li&gt;Input collection sharded, output collection unsharded but not on primary shard&lt;/li&gt;
	&lt;li&gt;Input collection unsharded but not on primary shard, output collection sharded&lt;/li&gt;
	&lt;li&gt;Input and output collections unsharded and input collection is moved during execution. The query should fail with QueryPlanKilled.&lt;/li&gt;
	&lt;li&gt;Input and output collections unsharded and output collection is moved during execution. During execution, update commands should switch over to targeting the inner collection&#8217;s new owner or the query should fail with QueryPlanKilled.&lt;/li&gt;
	&lt;li&gt;Input is not a collection, but $documents, so we should run on the shard that owns output collection (if present)&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="2406438">SERVER-79582</key>
            <summary>Remove HostTypeRequirement::kPrimaryShard from $merge</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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>pm3229-m1</label>
                    </labels>
                <created>Tue, 1 Aug 2023 18:17:38 +0000</created>
                <updated>Sun, 29 Oct 2023 21:18:08 +0000</updated>
                            <resolved>Wed, 18 Oct 2023 09:34:51 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5785683" author="xgen-internal-githook" created="Tue, 17 Oct 2023 17:53:35 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79582&quot; title=&quot;Remove HostTypeRequirement::kPrimaryShard from $merge&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79582&quot;&gt;&lt;del&gt;SERVER-79582&lt;/del&gt;&lt;/a&gt; Add a way for pipeline to request exact shard to be merger and use it in $merge&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4a1b0a119002b802b448bf446ef40313652c7e32&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4a1b0a119002b802b448bf446ef40313652c7e32&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5770158" author="JIRAUSER1270969" created="Wed, 11 Oct 2023 12:30:36 +0000"  >&lt;p&gt;&amp;gt; In case of input and output collections are on different shards, which shard should we prefer?&lt;/p&gt;

&lt;p&gt;According to current implementation, output shard, as having local writes is more profitable than local reads&#160;&lt;/p&gt;</comment>
                            <comment id="5766825" author="JIRAUSER1270969" created="Tue, 10 Oct 2023 10:05:34 +0000"  >&lt;p&gt;In case of input and output collections are on different shards, which shard should we prefer?&lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>When aggregation pipeline is split, there is a new value possible in explain field &amp;quot;mergeType&amp;quot; - &amp;quot;specificShard&amp;quot;.&lt;br/&gt;
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When &amp;quot;mergeType&amp;quot; == &amp;quot;specificShard&amp;quot;, a field &amp;quot;mergeShard&amp;quot; is added, containing the shard id of the merging shard.</customfieldvalue>

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