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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-12858] Explain _why_ we recommend an odd number of members</title>
                <link>https://jira.mongodb.org/browse/DOCS-12858</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;In&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/replica-set-architectures/#deploy-an-odd-number-of-members&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/core/replica-set-architectures/#deploy-an-odd-number-of-members&lt;/a&gt;&#160;it says:&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;Ensure that the replica set has an odd number of voting members. If you have an&#160;&lt;em&gt;even&lt;/em&gt;&#160;number of voting members, deploy an&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/core/replica-set-members/#replica-set-arbiters&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;arbiter&lt;/a&gt;&#160;so that the set has an odd number of voting members.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;I think it&apos;s worth also stating &lt;b&gt;why&lt;/b&gt;. Perhaps a statement like the following before &quot;If you have an even number....&quot;&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Having an odd number of members establishes  a &lt;a href=&quot;http://en.wikipedia.org/wiki/Quorum_(distributed_computing)&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;quorom&lt;/a&gt; to avoid &quot;split-brain&quot; scenarios in case of a network partition between data centers&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;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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                <environment></environment>
        <key id="836940">DOCS-12858</key>
            <summary>Explain _why_ we recommend an odd number of members</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="nicholas.cottrell@mongodb.com">Nic Cottrell</reporter>
                        <labels>
                    </labels>
                <created>Mon, 8 Jul 2019 10:00:21 +0000</created>
                <updated>Mon, 30 Oct 2023 20:38:21 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940447" author="edu.bot" created="Mon, 31 Oct 2022 16:05:40 +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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