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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-1372] Primary Node Rollback on Replica Set</title>
                <link>https://jira.mongodb.org/browse/DOCS-1372</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hi,&lt;br/&gt;
I have a question about a Primary node Rollback on a Replica Set.&lt;br/&gt;
The documentation says:&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/manual/core/replication/#replica-set-failover&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/replication/#replica-set-failover&lt;/a&gt;&lt;br/&gt;
&quot;Rollbacks occur when a primary accepts writes that other members of the set do not successfully replicate before the primary steps down.&quot;&lt;/p&gt;

&lt;p&gt;The question is:&lt;br/&gt;
What does &quot;other members&quot; exactly mean?:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;ALL other members need to replicate&lt;/li&gt;
	&lt;li&gt;even ONE member (lets call it S1) successfully replicates, and this is enough that Rollback does not occur, the data delivered to S1 will be delivered to other Secondaries.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Would you please also clarify this in the documentation.&lt;/p&gt;

&lt;p&gt;If you have a detailed information/documentation about this behaviour, please just let me know.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Edouard&lt;/p&gt;</description>
                <environment>Linux</environment>
        <key id="71262">DOCS-1372</key>
            <summary>Primary Node Rollback on Replica Set</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="eperov">Edouard Perov</reporter>
                        <labels>
                    </labels>
                <created>Tue, 9 Apr 2013 19:00:15 +0000</created>
                <updated>Tue, 16 Apr 2013 16:53:01 +0000</updated>
                            <resolved>Tue, 9 Apr 2013 23:10:18 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="314686" author="auto" created="Tue, 16 Apr 2013 16:52:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-04-16T16:52:06Z&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1372&quot; title=&quot;Primary Node Rollback on Replica Set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1372&quot;&gt;&lt;del&gt;DOCS-1372&lt;/del&gt;&lt;/a&gt;: adding clarification&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/10236539aefa77b39947b6f1a8fbec1aa816516f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/10236539aefa77b39947b6f1a8fbec1aa816516f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="309931" author="eperov" created="Wed, 10 Apr 2013 03:43:24 +0000"  >&lt;p&gt;Would you please point to where it is explained in the Mongo official documentation.&lt;br/&gt;
Thanks&lt;/p&gt;</comment>
                            <comment id="309805" author="eliot" created="Tue, 9 Apr 2013 23:10:18 +0000"  >&lt;p&gt;When the node dies, an election occurs, and the node with the most current data wins.  So as long as the data is replicated to any node which remains up, then the data is not rolled back.&lt;/p&gt;</comment>
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