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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-36255] Prohibit $out with readConcern level &quot;linearizable&quot;</title>
                <link>https://jira.mongodb.org/browse/SERVER-36255</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In MongoDB 4.0 and earlier, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d179b063b233f970b30acae8fbc53f33f7d60806/src/mongo/db/pipeline/document_source_out.cpp#L163-L166&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;explicitly ban readConcern level &quot;majority&quot; for aggregation pipelines containing $out&lt;/a&gt;.&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    auto readConcernLevel = repl::ReadConcernArgs::get(expCtx-&amp;gt;opCtx).getLevel();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    uassert(ErrorCodes::InvalidOptions,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$out cannot be used with a &apos;majority&apos; read concern level&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;,&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            readConcernLevel != repl::ReadConcernLevel::kMajorityReadConcern);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;However, it does allow readConcern level &quot;linearizable&quot;. As linearizability is a property of a single document, we will ban a $out aggregation with readConcern level &quot;linearizable&quot;, as it isn&apos;t clear what semantics will be offered to our users.&lt;/p&gt;

&lt;p&gt;This is a backwards-breaking change in 4.2; however, we will allow support for readConcern level &quot;majority&quot; in $out pipelines in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20445&quot; title=&quot;Add support for majority read concern level to Aggregation $out&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20445&quot;&gt;&lt;del&gt;SERVER-20445&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="575695">SERVER-36255</key>
            <summary>Prohibit $out with readConcern level &quot;linearizable&quot;</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="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Tue, 24 Jul 2018 19:12:19 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:37 +0000</updated>
                            <resolved>Wed, 12 Sep 2018 14:23:42 +0000</resolved>
                                                    <fixVersion>4.1.3</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2000574" author="xgen-internal-githook" created="Wed, 12 Sep 2018 14:21:27 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kyle Suarez&apos;, &apos;email&apos;: &apos;kyle.suarez@mongodb.com&apos;, &apos;username&apos;: &apos;ksuarz&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36255&quot; title=&quot;Prohibit $out with readConcern level &amp;quot;linearizable&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36255&quot;&gt;&lt;del&gt;SERVER-36255&lt;/del&gt;&lt;/a&gt; prohibit $out with readConcern level &quot;linearizable&quot;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/86126607271d98c67785ea5d884351dad39d8d8a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/86126607271d98c67785ea5d884351dad39d8d8a&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1963187" author="kyle.suarez" created="Wed, 1 Aug 2018 18:01:21 +0000"  >&lt;p&gt;Changing this ticket to instead ban readConcern level &quot;linearizable&quot;.&lt;/p&gt;</comment>
                            <comment id="1955575" author="kyle.suarez" created="Tue, 24 Jul 2018 20:05:32 +0000"  >&lt;p&gt;Throwing into Needs Triage to debate allowing &quot;linearizable&quot; and testing it, or banning it altogether.&lt;/p&gt;</comment>
                    </comments>
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                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="603529">DOCS-12053</issuekey>
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                            <issuelinktype id="10012">
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            <issuekey id="230131">SERVER-20445</issuekey>
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