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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>[DOCS-13451] Disable Read Concern Majority references only a 3-Member Primary-Secondary-Arbiter Architecture</title>
                <link>https://jira.mongodb.org/browse/DOCS-13451</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;p&gt;Disable Read Concern Majority references only a 3-Member Primary-Secondary-Arbiter Architecture&lt;/p&gt;

&lt;p&gt;&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;https://docs.mongodb.com/manual/reference/read-concern-majority/#disable-read-concern-majority&lt;/a&gt;&lt;br/&gt;
references only a 3-Member Primary-Secondary-Arbiter Architecture&lt;br/&gt;
It can actually apply to almost any Arbiter scenario.&lt;br/&gt;
Example:&lt;br/&gt;
For any replica set that contains arbiters it is possible for there to be a voting majority without having the ability to complete a majority read. There are 5 voting nodes in this replica set, so majority is 3. If 2 data bearing nodes were unavailable, there would still be 3 votes from the primary, secondary, and arbiter, so the replica set would be able to elect a primary and *&lt;b&gt;accept&lt;/b&gt;* reads. However, in that situation reads using a read concern of r:majority or stronger could not be *&lt;b&gt;completed&lt;/b&gt;&lt;b&gt;, and no reads could be **processed&lt;/b&gt;* by a majority of the replica set in order to meet read concern majority. This means the primary and surviving secondary must retain a snapshot at the most recent majority commit point while processing incoming reads. This increases cache pressure and memory usage, and if the situation persists, can lead to increased disk usage, and in extreme cases can cause nodes to crash.&lt;/p&gt;

&lt;p&gt;Examples: &lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;DC1-P,S,A DC2-S,S. If DC1 goes offline you would have issues with both read concern &quot;majority&quot; and elections. If DC2 went offline you would lose read concern &quot;majority&quot;.&lt;/li&gt;
	&lt;li&gt;Even if all PSSSA Replica Set members were in a single DC the loss of 2 Secondaries would still cause the loss of read concern &quot;majority&quot;.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This warning is posted for any Replica Set containing an Arbiter:&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;2020-01-24T21:39:45.071-0500 I REPL     [replexec-0] &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;2020-01-24T21:39:45.071-0500 I REPL     [replexec-0] ** WARNING: This replica set uses arbiters, but readConcern:majority is enabled &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;2020-01-24T21:39:45.071-0500 I REPL     [replexec-0] **          for this node. This is not a recommended configuration. Please see &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;2020-01-24T21:39:45.071-0500 I REPL     [replexec-0] **          https://dochub.mongodb.org/core/psa-disable-rc-majority-4.0&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;so customers get confused when they have something like a PSSSA&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://support.mongodb.com/case/00638046?c__ccId=CC-2074608&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://support.mongodb.com/case/00638046?c__ccId=CC-2074608&lt;/a&gt;&lt;/p&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;
</description>
                <environment></environment>
        <key id="1185316">DOCS-13451</key>
            <summary>Disable Read Concern Majority references only a 3-Member Primary-Secondary-Arbiter Architecture</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="charles.merrill@mongodb.com">Charles Merrill</reporter>
                        <labels>
                            <label>docs-replication</label>
                    </labels>
                <created>Tue, 25 Feb 2020 22:05:58 +0000</created>
                <updated>Mon, 30 Oct 2023 20:26:32 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940396" author="edu.bot" created="Mon, 31 Oct 2022 16:04:37 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
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