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    <title>MongoDB Jira</title>
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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>[SERVER-14531] Abort election if freshness check cannot ensure majority of voters</title>
                <link>https://jira.mongodb.org/browse/SERVER-14531</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Add an additional requirement to freshness checking to ensure that a majority of voters can vote in the election before starting. This additional check will result in a fail-fast path when a majority won&apos;t be voting, and might reduce election times when a majority is later available.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Longer Explanation&lt;/b&gt;&lt;br/&gt;
This issue is similar to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14382&quot; title=&quot;CmdReplSetFresh should take last election time and the 30 second lease time into account&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14382&quot;&gt;&lt;del&gt;SERVER-14382&lt;/del&gt;&lt;/a&gt;, in that you don&apos;t want the election protocol to call CmdReplSetElect if you have any reason to believe that the election will not be successful. Calling CmdReplSetElect and failing is bad because members that do vote &quot;yes&quot; will be barred from voting for 30 seconds.&lt;/p&gt;

&lt;p&gt;A candidate determines that a majority of the replica set is up by looking at the state of member heartbeats, via Consensus::aMajoritySeemsToBeUp(). If a network was just partitioned, this information may be inaccurate, because the latest heartbeats may not have failed yet. So, when a candidate calls CmdReplSetFresh to guage whether it should run an election, it should count the number of responses it gets to ensure a majority is truly up. With the code now, less than a majority may respond saying &quot;go ahead&quot;, and the election protocol still proceeds to call CmdReplSetElect.&lt;/p&gt;</description>
                <environment></environment>
        <key id="146667">SERVER-14531</key>
            <summary>Abort election if freshness check cannot ensure majority of voters</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="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="zardosht">Zardosht Kasheff</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 Jul 2014 13:17:42 +0000</created>
                <updated>Sat, 25 Oct 2014 22:39:04 +0000</updated>
                            <resolved>Wed, 15 Oct 2014 15:06:21 +0000</resolved>
                                                    <fixVersion>2.7.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="738708" author="xgen-internal-githook" created="Fri, 10 Oct 2014 15:43:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;scotthernandez&apos;, u&apos;name&apos;: u&apos;Scott Hernandez&apos;, u&apos;email&apos;: u&apos;scotthernandez@gmail.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14531&quot; title=&quot;Abort election if freshness check cannot ensure majority of voters&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14531&quot;&gt;&lt;del&gt;SERVER-14531&lt;/del&gt;&lt;/a&gt;: ensure enough freshness responses&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9d0f6650eff7c1e467a55d01ceb9e425eb86e7c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9d0f6650eff7c1e467a55d01ceb9e425eb86e7c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="662972" author="milkie" created="Fri, 18 Jul 2014 12:31:01 +0000"  >&lt;p&gt;We&apos;re proposing to do away with the 30 second voting period, so after we&apos;re done with the refactor we&apos;ll come back to this and make sure it&apos;s no longer an issue.  Thanks for reporting it!&lt;/p&gt;</comment>
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