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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-28333] Question about network partition and replica set</title>
                <link>https://jira.mongodb.org/browse/SERVER-28333</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello there,&lt;br/&gt;
  I have a question about a possible scenario happened with a replica set, involving a network partition. Mongo version is 3.2.11&lt;/p&gt;

&lt;p&gt;Let&apos;s suppose to have 3 nodes: A, B, C. A is the primary. B, C are secondary.&lt;br/&gt;
Suddendly a network partition happens and it continues for lot of hours. During the network partition A and B can connect, as well as B and C.&lt;br/&gt;
If I correctly understand how replication works:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;A still see a majority of nodes and remains primary&lt;/li&gt;
	&lt;li&gt;C don&apos;t see A and thus attempts to start an election&lt;/li&gt;
	&lt;li&gt;C is disconnected from A and thus its data become older and older&lt;/li&gt;
	&lt;li&gt;B still see A and thus ignores the request for election from B&lt;/li&gt;
	&lt;li&gt;B continues to replicate from A&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Now let&apos;s suppose that, after a lot of hours, without fixing the network partition, node A crashes.&lt;br/&gt;
If I&apos;m correct B and C will start and election.&lt;/p&gt;

&lt;p&gt;The question is: are we 100% sure that the election will result in the node B (which is synchronized with A) to be elected as primary ?&lt;br/&gt;
Or there is a possibility that instead the node C (which has very old data).&lt;/p&gt;</description>
                <environment></environment>
        <key id="365298">SERVER-28333</key>
            <summary>Question about network partition and replica set</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="aldo">Aldo</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Mar 2017 14:11:45 +0000</created>
                <updated>Wed, 31 May 2017 21:23:37 +0000</updated>
                            <resolved>Tue, 28 Mar 2017 17:58:18 +0000</resolved>
                                    <version>3.2.11</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1535099" author="thomas.schubert" created="Tue, 28 Mar 2017 17:58:18 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aldo&quot; class=&quot;user-hover&quot; rel=&quot;aldo&quot;&gt;aldo&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;In the case you describe, Node B would be elected as Primary.&lt;/p&gt;

&lt;p&gt;Please note that SERVER project is for reporting bugs or feature suggestions for the MongoDB server. For MongoDB-related support discussion please post on the &lt;a href=&quot;http://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or &lt;a href=&quot;http://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;. A question like this involving more discussion would be best posted on the mongodb-users group.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Thomas&lt;/p&gt;</comment>
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