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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>
    </build-info>


<item>
            <title>[SERVER-44921] 4.2: $changeStream cannot run with a readConcern other than &apos;majority&apos;</title>
                <link>https://jira.mongodb.org/browse/SERVER-44921</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In a 3-node replica set with server 4.2.1 and featureCompatibilityVersion 4.2, I tried turning off majority read concern in my client and got:&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;
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					&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;Exception in thread &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;QueueChangeStreamListener-1&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; com.mongodb.MongoCommandException: Command failed with error &lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;72&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; (InvalidOptions): &apos;&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&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;$changeStream cannot run with a readConcern other than &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;&apos;majority&apos;&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;, or in a multi-document transaction. Current readConcern: { readConcern: { level: &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;local&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;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;&apos; on server xxx:27017. The full response is { &quot;operationTime&quot; : { &quot;$timestamp&quot; : { &quot;t&quot; : 1575327297, &quot;i&quot; : 13 } }, &quot;ok&quot; : 0.0, &quot;errmsg&quot; : &quot;$changeStream cannot run with a readConcern other than &apos;&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;majority&apos;&lt;/span&gt;&lt;/pre&gt;
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				&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;, or in a multi-document transaction. Current readConcern: { readConcern: { level: \&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;local\&quot; } }&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;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;code&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;72&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;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;codeName&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;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;InvalidOptions&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;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;$clusterTime&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; : { &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;clusterTime&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; : { &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$timestamp&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;
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				&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;{ &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;t&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;1575327297&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;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;i&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;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;13&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;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;signature&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;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;hash&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;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;$binary&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; : &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;IRojwuY5C67DDcA8FXympzLzMxE=&quot;&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;, &lt;/span&gt;&lt;span style=&quot;color: blue; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&quot;$type&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;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;00&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;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;keyId&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;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;$numberLong&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;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;6730051918464286727&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;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The docs say:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;Starting in MongoDB 4.2,&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/changeStreams/#&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;change streams&lt;/a&gt;&#160;are available regardless of the&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/read-concern-majority/#readconcern.%22majority%22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;&quot;majority&quot;&lt;/tt&gt;&lt;/a&gt;&#160;read concern support; that is, read concern&#160;&lt;tt&gt;majority&lt;/tt&gt;&#160;support can be either enabled (default) or&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/read-concern-majority/#disable-read-concern-majority&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;disabled&lt;/a&gt;&#160;to use change streams.&lt;/p&gt;

&lt;p&gt;In MongoDB 4.0 and earlier,&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/changeStreams/#&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;change streams&lt;/a&gt;&#160;are available only if&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/read-concern-majority/#readconcern.%22majority%22&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;&quot;majority&quot;&lt;/tt&gt;&lt;/a&gt;&#160;read concern support is enabled (default).&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;That makes me think change streams should work in a cluster that has majority read concern &lt;b&gt;enabled&lt;/b&gt;, but where the client chooses not to use it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1031639">SERVER-44921</key>
            <summary>4.2: $changeStream cannot run with a readConcern other than &apos;majority&apos;</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="13202">Works as Designed</resolution>
                                        <assignee username="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="mzs">Michael Smith</reporter>
                        <labels>
                    </labels>
                <created>Tue, 3 Dec 2019 00:06:38 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:59 +0000</updated>
                            <resolved>Mon, 13 Jan 2020 17:56:41 +0000</resolved>
                                    <version>4.2.1</version>
                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2722489" author="william.schultz" created="Mon, 13 Jan 2020 17:56:22 +0000"  >&lt;p&gt;Ok, great. &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mzs&quot; class=&quot;user-hover&quot; rel=&quot;mzs&quot;&gt;mzs&lt;/a&gt; I am going to close this ticket if you have no further questions.&lt;/p&gt;</comment>
                            <comment id="2719606" author="mzs" created="Fri, 10 Jan 2020 21:55:13 +0000"  >&lt;p&gt;Yes, that&apos;s clear, thanks!&lt;/p&gt;</comment>
                            <comment id="2714885" author="william.schultz" created="Thu, 9 Jan 2020 18:57:03 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mzs&quot; class=&quot;user-hover&quot; rel=&quot;mzs&quot;&gt;mzs&lt;/a&gt; The &lt;tt&gt;enableMajorityReadConcern&lt;/tt&gt; flag is a per server (mongod process) parameter. If it is set to &quot;true&quot;, then yes, it can cause cache pressure issues on that node if secondaries are lagging too far behind. If it is set to &quot;false&quot;, however, cache pressure issues should not be a problem even if secondaries are lagging since we will not maintain history back to the majority commit point. Normally, if &lt;tt&gt;enableMajorityReadConcern:false&lt;/tt&gt;, reads with &quot;majority&quot; read concern level will fail, since the server does not have the proper mechanisms enabled to satisfy them. For change streams, however, if you specify &quot;majority&quot; read concern level and run them against a 4.2 server with &lt;tt&gt;enableMajorityReadConcern:false&lt;/tt&gt;, we have implemented an &lt;em&gt;alternate&lt;/em&gt; mechanism for satisfying the &quot;majority&quot; guarantees required by change streams. This mechanism does not lead to cache pressure issues on the server. It was only implemented for change streams which is why they should succeed when you run them with &quot;majority&quot; read concern against a 4.2 server with &lt;tt&gt;enableMajorityReadConcern:false&lt;/tt&gt;. Although it may seem counterintuitive that a &quot;majority&quot; read concern operation succeeds against a node with &lt;tt&gt;enableMajorityReadConcern:false&lt;/tt&gt;, we made that choice to keep the external API the same so that existing users of change streams against nodes with &lt;tt&gt;enableMajorityReadConcern:true&lt;/tt&gt; would not have to change their applications if they switched to using &lt;tt&gt;enableMajorityReadConcern:false&lt;/tt&gt;. Does that clarify things for you?&lt;/p&gt;</comment>
                            <comment id="2584107" author="mzs" created="Wed, 4 Dec 2019 21:04:01 +0000"  >&lt;p&gt;I understand enabling majority read concern at the server level can cause cache pressure when secondaries are lagging because the server needs to keep oplog entries in cache until they&apos;re majority-acknowledged. Would using a change stream with majority read concern in one small collection, cause bulk writes to an unrelated collection to get stuck in the cache when they otherwise wouldn&apos;t? (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44948&quot; title=&quot;High cache pressure in 4.2 replica set vs 4.0&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44948&quot;&gt;&lt;del&gt;SERVER-44948&lt;/del&gt;&lt;/a&gt;)&lt;/p&gt;</comment>
                            <comment id="2583064" author="william.schultz" created="Wed, 4 Dec 2019 14:33:58 +0000"  >&lt;p&gt;As mentioned in &lt;a href=&quot;https://docs.mongodb.com/manual/reference/read-concern-majority/#disable-read-concern-majority&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this docs section&lt;/a&gt;, even if any node in a cluster has &lt;tt&gt;enableMajorityReadConcern=false&lt;/tt&gt;, change streams are still supported. When trying to use a change stream, the client still needs to specify read concern level &quot;majority&quot;, though, since change streams fundamentally must only see &quot;majority&quot; committed data. One way to view it is that &quot;majority&quot; read concern level is still supported even if &lt;tt&gt;enableMajorityReadConcern=false&lt;/tt&gt;, but only for change streams specifically. I can take a look over the rest of the documentation to see if we can make this fact more clear.&lt;/p&gt;</comment>
                            <comment id="2581213" author="mzs" created="Wed, 4 Dec 2019 02:09:40 +0000"  >&lt;p&gt;I restarted my cluster with &lt;tt&gt;replication.enableMajorityReadConcern: false&lt;/tt&gt; and got the same error.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;But, with&#160;&lt;tt&gt;replication.enableMajorityReadConcern: false&lt;/tt&gt;, if I set my $changeStream client to use majority read concern (even though it&apos;s disabled), it works. So it seems $changeStream wants you to ask for majority read concern, even if (as I understand it) the cluster is configured not to provide majority reads.&lt;/p&gt;</comment>
                    </comments>
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