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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-638] Document effect of hidden secondary being most current in failover scenario</title>
                <link>https://jira.mongodb.org/browse/DOCS-638</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;In the event of a replica set failover, if a hidden secondary is more current that the visible secondaries, one of the visible secondaries will not be immediately elected primary, but will instead catch up to the hidden secondary before one of them is elected primary.&lt;/p&gt;

&lt;p&gt;The same is true for a secondary with priority of 0, even if not hidden.&lt;/p&gt;

&lt;p&gt;This behaviour is implied, but not spelt out explicitly, in the &lt;a href=&quot;http://docs.mongodb.org/manual/core/replication-internals/#elections&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replication Internals - Elections&lt;/a&gt; documentation:&lt;/p&gt;
&lt;blockquote&gt;
&lt;p&gt;A member of the set will veto an election under the following conditions:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&amp;lt;snip/&amp;gt;&lt;/li&gt;
	&lt;li&gt;If the member seeking an election is not up-to-date with the most recent operation accessible in the replica set.&lt;/li&gt;
&lt;/ul&gt;
&lt;/blockquote&gt;

&lt;p&gt;It warrants explicit mention, however, as users could easily incorrectly assume that the behaviour is otherwise: that the visible secondary becomes primary immediately and hence data is lost (data that the hidden secondary had and the visible secondary did not). &lt;/p&gt;

&lt;p&gt;I suggest documenting it in the following pages:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/core/replication-internals/#elections&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replication Internals - Elections&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/administration/replica-sets/#failover-and-recovery&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replica Set Administration - Troubleshooting - Failover and Recovery&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment>Replica set failover</environment>
        <key id="54158">DOCS-638</key>
            <summary>Document effect of hidden secondary being most current in failover scenario</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="jantje.daniel">Ian Daniel</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Oct 2012 04:58:26 +0000</created>
                <updated>Mon, 30 Oct 2023 22:01:09 +0000</updated>
                            <resolved>Tue, 6 Nov 2012 22:48:20 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="183346" author="auto" created="Tue, 6 Nov 2012 22:47:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-11-06T22:47:31Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: minor: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-638&quot; title=&quot;Document effect of hidden secondary being most current in failover scenario&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-638&quot;&gt;&lt;del&gt;DOCS-638&lt;/del&gt;&lt;/a&gt; note about buildindexes-false syncing&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/9632c5de7792be54a2382dc832747e35c9ce4a77&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/9632c5de7792be54a2382dc832747e35c9ce4a77&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="183345" author="auto" created="Tue, 6 Nov 2012 22:47:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2012-11-06T22:20:44Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-638&quot; title=&quot;Document effect of hidden secondary being most current in failover scenario&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-638&quot;&gt;&lt;del&gt;DOCS-638&lt;/del&gt;&lt;/a&gt; replica set election update regarding secondary only members&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0299ca89566d0e2c5b654899788605872bbb5149&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0299ca89566d0e2c5b654899788605872bbb5149&lt;/a&gt;&lt;/p&gt;</comment>
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