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    <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-11564] replset reconfigs trigger elections sometimes in some cases in which they shouldn&apos;t</title>
                <link>https://jira.mongodb.org/browse/SERVER-11564</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During a reconfig primary is relinquished and then recovered almost immediately. This is normal and fine.&lt;/p&gt;

&lt;p&gt;Sometimes however an election occurs and it takes 6-8 seconds before the primary resumes being primary. In these problem cases, the primary usually relinquishes because &quot;&lt;span class=&quot;error&quot;&gt;&amp;#91;rsMgr&amp;#93;&lt;/span&gt; can&apos;t see a majority of the set, relinquishing primary.&quot; This comes from msgCheckNewState, which is run when we receive a heartbeat response.&lt;/p&gt;

&lt;p&gt;I believe this happens due to a race in shutting down our ReplSetHealthPollTasks because halting a task only prevents it from running again. This means that if we are waiting on a heartbeat response when we halt the task we will still process that response before the task truly ends.&lt;/p&gt;

&lt;p&gt;It may make sense to change the ReplSetHealthPollTask to be a BackgroundJob rather than a Task as stopping a BackgroundJob is more robust and we can wait for the job to actually finish. But this seems like a nontrivial change and probably cannot be gracefully backported to 2.4&lt;/p&gt;</description>
                <environment></environment>
        <key id="97053">SERVER-11564</key>
            <summary>replset reconfigs trigger elections sometimes in some cases in which they shouldn&apos;t</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="3">Duplicate</resolution>
                                        <assignee username="spencer@mongodb.com">Spencer Brody</assignee>
                                    <reporter username="matt.dannenberg">Matt Dannenberg</reporter>
                        <labels>
                            <label>elections</label>
                    </labels>
                <created>Mon, 4 Nov 2013 21:37:15 +0000</created>
                <updated>Wed, 10 Dec 2014 23:05:22 +0000</updated>
                            <resolved>Fri, 10 Oct 2014 21:58:18 +0000</resolved>
                                    <version>2.4.6</version>
                    <version>2.5.3</version>
                                                    <component>Replication</component>
                                        <votes>1</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="739170" author="spencer" created="Fri, 10 Oct 2014 21:58:18 +0000"  >&lt;p&gt;dupe of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-15160&quot; title=&quot;TopologyCoordinatorImpl should not always step down on reconfig&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-15160&quot;&gt;&lt;del&gt;SERVER-15160&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;create a 5 node replicaset with nodes as follows:&lt;br/&gt;
1) priority: 3&lt;br/&gt;
2) priority: 2&lt;br/&gt;
3) priority: 0, hidden: true&lt;br/&gt;
4) arbiter&lt;br/&gt;
5) arbiter&lt;/p&gt;

&lt;p&gt;preform a reconfig that increases the priority of node 1&lt;br/&gt;
this will trigger an unnecessary election much of the time&lt;br/&gt;
if it doesn&apos;t change it back and it may&lt;br/&gt;
if that doesn&apos;t that change it again&lt;br/&gt;
repeat as needed, which shouldn&apos;t be many times (it was happening about 4 out of 5 times for me)&lt;/p&gt;</customfieldvalue>

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