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    <title>MongoDB Jira</title>
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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-12598] Docs for SERVER-20445: Add support for majority read concern level to Aggregation $out</title>
                <link>https://jira.mongodb.org/browse/DOCS-12598</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;$out now supports readConcern levels &apos;local&apos; and &apos;majority&apos; for the read part of the aggregate.&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;For &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20214&quot; title=&quot;Stop supporting majority read concern level with MapReduce and Aggregation $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20214&quot;&gt;&lt;del&gt;SERVER-20214&lt;/del&gt;&lt;/a&gt; we are removing support for majority read concern level in these operations because we cannot write in that mode. This ticket is to reenable support.&lt;/p&gt;

&lt;p&gt;The current plan is to emulate majority read concern level by waiting for w:majority in the portions of those operations that write (aggregations including $out and all map reduces) and keep the read concern level for the portions that don&apos;t (aggregations not including $out including all work from the shard phase). It is unclear right now which category inline map reduce falls under. Part of this work is to ensure that this approach is valid. &lt;/p&gt;&lt;/blockquote&gt;

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

&lt;ul&gt;
	&lt;li&gt;source/includes/fact-aggregate-readConcern.rst
	&lt;ul&gt;
		&lt;li&gt;This is included in the agg command/method pages (was missing in $out and read concern majority - so will add)&lt;/li&gt;
	&lt;/ul&gt;
	&lt;/li&gt;
	&lt;li&gt;source/reference/operator/aggregation/out.txt&lt;/li&gt;
	&lt;li&gt;source/reference/read-concern-majority.txt&lt;/li&gt;
	&lt;li&gt;source/release-notes/4.2-compatibility.txt&lt;/li&gt;
&lt;/ul&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;
</description>
                <environment></environment>
        <key id="729009">DOCS-12598</key>
            <summary>Docs for SERVER-20445: Add support for majority read concern level to Aggregation $out</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Apr 2019 15:25:18 +0000</created>
                <updated>Mon, 13 Nov 2023 18:23:35 +0000</updated>
                            <resolved>Thu, 13 Jun 2019 19:37:29 +0000</resolved>
                                                    <fixVersion>4.1.6</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>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2283896" author="kay.kim@10gen.com" created="Thu, 13 Jun 2019 19:37:22 +0000"  >

&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}

&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12484&quot; title=&quot;Docs for SERVER-38360: Disallow pipelines which read from the same namespace that they write to&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12484&quot;&gt;&lt;del&gt;DOCS-12484&lt;/del&gt;&lt;/a&gt;: 4.2 $out stage and read concern majority&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/759c68c83a9cc24052bf6250b3478207cbb57e88&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/759c68c83a9cc24052bf6250b3478207cbb57e88&lt;/a&gt;&lt;/p&gt;</comment>
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