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    <title>MongoDB Jira</title>
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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-10225] Replica set failover speed improvement</title>
                <link>https://jira.mongodb.org/browse/SERVER-10225</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Election algorithm modifications will be made to reduce failover time.  Target maximum downtime is 2 seconds.&lt;br/&gt;
The new algorithm will be activated by running replSetReconfig with a field &quot;protocolVersion&quot; set to 1.&lt;/p&gt;</description>
                <environment></environment>
        <key id="82461">SERVER-10225</key>
            <summary>Replica set failover speed improvement</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                            <label>elections</label>
                    </labels>
                <created>Tue, 16 Jul 2013 18:48:32 +0000</created>
                <updated>Wed, 28 Oct 2015 18:01:56 +0000</updated>
                            <resolved>Wed, 23 Sep 2015 19:25:51 +0000</resolved>
                                    <version>2.4.5</version>
                                    <fixVersion>3.1.9</fixVersion>
                                    <component>Replication</component>
                                        <votes>7</votes>
                                    <watches>23</watches>
                                                                                                                <comments>
                            <comment id="1041225" author="milkie" created="Wed, 23 Sep 2015 19:25:51 +0000"  >&lt;p&gt;With &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-18498&quot; title=&quot;New replica set configurations have protocolVersion=1 by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-18498&quot;&gt;&lt;del&gt;SERVER-18498&lt;/del&gt;&lt;/a&gt; completed, replica set failover time can now be configured to be faster.&lt;/p&gt;</comment>
                            <comment id="699042" author="jlpedrosa@gmail.com" created="Thu, 21 Aug 2014 22:24:46 +0000"  >&lt;p&gt;HI All,&lt;/p&gt;

&lt;p&gt;I would like to ask that in case of manual failover (replSetSetpDown), it can&apos;t be speeded up just by triggering the actual failover happens just after the new primary is elected? In other words, let&apos;s start the election, and once the new primary is available, let&apos;s failover and reduce the time in which the writes are not available.&lt;/p&gt;

&lt;p&gt;We are studying using MongoDB in a real time system, in which 3-4 seconds of a manual failover, can trigger bigger systems failovers. (if the application that would use mongo does not respond for 3 seconds, the backup system would kick in), this is very inconvenient as forces to disable other systems failover any time you want to compact a db in a secondary and put it back as primary.&lt;/p&gt;

&lt;p&gt;Best Regards&lt;/p&gt;</comment>
                            <comment id="552407" author="nelhage" created="Wed, 16 Apr 2014 23:41:48 +0000"  >&lt;p&gt;re: (2), the rs.freeze() method is exactly this: &lt;a href=&quot;http://docs.mongodb.org/manual/reference/method/rs.freeze/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/method/rs.freeze/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;for (1), what we do is freeze all nodes other than the desired new master. You can also configure priorities to prevent nodes other than the desired primary from attempting to get elected.&lt;/p&gt;</comment>
                            <comment id="552373" author="zmokhtar" created="Wed, 16 Apr 2014 22:58:14 +0000"  >&lt;p&gt;I would like to suggest two possible solutions:&lt;/p&gt;

&lt;p&gt;1)  Add an optional parameter to rs.stepDown that allows the administrator to pass in the prefered new Master.  This would let other members in the cluster that the first vote in the next election should be the new Master.&lt;/p&gt;

&lt;p&gt;2)  Allow secondaries to stepDown(seconds).  If I can stepDown all of the non-eligible secondaries, then the next election will happen quickly since only one viable master will be available.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="103214">SERVER-12163</issuekey>
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