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    <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-12472] Docs for SERVER-38311: Investigate changing host type requirement for $out</title>
                <link>https://jira.mongodb.org/browse/DOCS-12472</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;The $out stage can now be run in parallel on all shards if&lt;br/&gt;
1) the targeted collection is sharded (so only modes &quot;insertDocuments&quot; or &quot;replaceDocuments&quot;, as of this writing)&lt;br/&gt;
2) The collection of the aggregation (e.g. &quot;foo&quot; in db.foo.aggregate(&lt;span class=&quot;error&quot;&gt;&amp;#91;{$out: &amp;quot;bar&amp;quot;}&amp;#93;&lt;/span&gt;)) is sharded&lt;br/&gt;
3) There is no stage which otherwise &quot;forces a split&quot; of the pipeline like a $group.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;During the design we agreed to the following change in merging policy:&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;We will change the pipeline splitting logic such that $out is not forced to execute in the merger part of the pipeline, and does not cause the pipeline to split. If $out is preceded by stages that can all execute in the shards part, then each shard will be responsible for dispatching writes to the correct shard.&lt;/p&gt;
&lt;blockquote&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
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        <key id="696973">DOCS-12472</key>
            <summary>Docs for SERVER-38311: Investigate changing host type requirement for $out</summary>
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                                            <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="13203">Gone away</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Feb 2019 03:12:50 +0000</created>
                <updated>Mon, 13 Nov 2023 18:25:14 +0000</updated>
                            <resolved>Mon, 29 Jul 2019 19:02:46 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
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