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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-21018] Prevent priority takeover during an outstanding election</title>
                <link>https://jira.mongodb.org/browse/SERVER-21018</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In jstests/replsets/tags.js, among the 5 nodes, node 1 has priority 2 and node 2 has priority 3. If the following scenario, lower-priority node 1 will steal the primary from node 2 until node 2 takes over again.&lt;/p&gt;

&lt;p&gt;1. Node 0 becomes the primary in term 1 at the beginning.&lt;br/&gt;
2. Node 2 starts a new election in term 2 because it has a higher priority than Node 0.&lt;br/&gt;
3. Node 1 gets the vote request and votes yes. It updates its term to 2. &lt;br/&gt;
4. Node 1 considers starting a new election because Node 0 is still the legal primary with a lower priority. Node 1 schedules a take-over in several seconds later.&lt;br/&gt;
5. Node 2 gathers enough votes and announces its win.&lt;br/&gt;
6. On Node 1, the scheduled take-over happens and steals the primary.&lt;/p&gt;

&lt;p&gt;If step 4 happens before step 3, everything&apos;s fine since term update will cancel priority take-over. If step 4 happens after step 5, it&apos;s also fine, because Node 1 won&apos;t stand up for election after knowing Node 2 is the new primary. Usually, the window between step 2 and step 4 is several milliseconds, but it&apos;s still possible.&lt;/p&gt;

&lt;p&gt;To solve this problem, we could schedule the take-over only if the current primary is in the latest term I know, preventing step 3 from happening. In other words, if the replset is not stable, a node won&apos;t try to take over the primary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="235120">SERVER-21018</key>
            <summary>Prevent priority takeover during an outstanding election</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Mon, 19 Oct 2015 22:07:24 +0000</created>
                <updated>Wed, 25 Jan 2017 21:59:48 +0000</updated>
                            <resolved>Wed, 21 Oct 2015 22:51:33 +0000</resolved>
                                                    <fixVersion>3.2.0-rc1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1067445" author="xgen-internal-githook" created="Wed, 21 Oct 2015 22:48:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-21018&quot; title=&quot;Prevent priority takeover during an outstanding election&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-21018&quot;&gt;&lt;del&gt;SERVER-21018&lt;/del&gt;&lt;/a&gt; Prevent priority takeover during an outstanding election&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ce438c5dcac373a272eb7dc80ce8d37a74394e4d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ce438c5dcac373a272eb7dc80ce8d37a74394e4d&lt;/a&gt;&lt;/p&gt;</comment>
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