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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-28593] Separate notion of &apos;down&apos; and &apos;unknown&apos; in heartbeat liveness monitoring</title>
                <link>https://jira.mongodb.org/browse/SERVER-28593</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a node first starts up, it has no idea the state of the other nodes in the replica set.  Currently it defaults to assuming all nodes are &apos;down&apos; until it gets a heartbeat proving otherwise.  This can sometimes cause nodes to call for elections unnecessarily.  Instead we should consider nodes in state &apos;unknown&apos; until the heartbeat timeout passes without hearing from them, and not call for an election so long as any nodes are still in state &apos;unknown&apos;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="370507">SERVER-28593</key>
            <summary>Separate notion of &apos;down&apos; and &apos;unknown&apos; in heartbeat liveness monitoring</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Mon, 3 Apr 2017 19:19:28 +0000</created>
                <updated>Tue, 6 Dec 2022 04:04:18 +0000</updated>
                            <resolved>Tue, 4 Apr 2017 22:49:55 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1540940" author="spencer" created="Tue, 4 Apr 2017 22:49:02 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; made a good point, the heartbeat timeout is generally less than or equal to the election timeout (currently they both default to 10 seconds) so there shouldn&apos;t really be a case where we call an election at startup while still waiting for a heartbeat to time out.  So I feel like the cases we&apos;ve seen in build failures we thought were caused by this may have something else going on.&lt;/p&gt;</comment>
                            <comment id="1540917" author="siyuan.zhou@10gen.com" created="Tue, 4 Apr 2017 22:17:44 +0000"  >&lt;p&gt;The &lt;tt&gt;health&lt;/tt&gt; field of &lt;tt&gt;MemberHeartbeatData&lt;/tt&gt; is already an integer. -1 means unknown, 0 means down and 1 means up. So this ticket is more about not calling for an election as long as any nodes are still unknown.&lt;/p&gt;</comment>
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