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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-38496] A secondary should be able to determine if it&apos;s healthy (to avoid unwanted election calls)</title>
                <link>https://jira.mongodb.org/browse/SERVER-38496</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A &lt;tt&gt;pv1&lt;/tt&gt; replica set member can call for an election due to its own performance degradation. If there happens to be a certain lag on other members, the election can be won by the affected member, which would not be a desirable outcome.&lt;/p&gt;

&lt;p&gt;It would be great if a secondary would be able to determine if that node itself is not healthy and therefore a call for election is not justified.&lt;/p&gt;</description>
                <environment></environment>
        <key id="648744">SERVER-38496</key>
            <summary>A secondary should be able to determine if it&apos;s healthy (to avoid unwanted election calls)</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="dmitry.ryabtsev@mongodb.com">Dmitry Ryabtsev</reporter>
                        <labels>
                    </labels>
                <created>Mon, 10 Dec 2018 06:32:43 +0000</created>
                <updated>Wed, 17 May 2023 14:40:02 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="2085196" author="judah.schvimer" created="Mon, 10 Dec 2018 06:49:37 +0000"  >&lt;p&gt;If node A runs for election, while node B thinks node A is unhealthy, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dmitry.ryabtsev&quot; class=&quot;user-hover&quot; rel=&quot;dmitry.ryabtsev&quot;&gt;dmitry.ryabtsev&lt;/a&gt; and I discussed that it would be problematic for node B to vote &apos;no&apos; to node A&apos;s election. &lt;/p&gt;

&lt;p&gt;To my understanding, this is specifically about node A choosing &lt;em&gt;not&lt;/em&gt; to run for election if it knows itself to be unhealthy. This could lead to no node running for election in certain cases where currently an unhealthy node would get elected, or slower election times where an unhealthy node could get elected faster than waiting for a healthy one. Slower election times to a healthy node is probably better than faster elections to a worse primary. &lt;/p&gt;

&lt;p&gt;No primary at all is definitely a problem though.&lt;/p&gt;

&lt;p&gt;If the &quot;unhealthiness&quot; is due to networking problems, this could be bad for w:1 availability in certain cases, but doesn&apos;t seem to negatively impact w:majority availability since a primary that can&apos;t do networking is no better than no primary at all for w:majority writes. The w:1 availability problem could be addressed by a &quot;networking unhealthy&quot; node increasing its election timeout rather than not running for election at all.&lt;/p&gt;

&lt;p&gt;If the &quot;unhealthiness&quot; is due to storage or CPU problems, then w:1 availability is likely going to be a problem if the node becomes primary as well, so no primary is maybe not worse than a primary that can&apos;t write to disk.&lt;/p&gt;</comment>
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