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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-84297] Make maximumVoteRequestTimeoutMS a configurable setting</title>
                <link>https://jira.mongodb.org/browse/SERVER-84297</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In some replica set environments,&#160;the primary catchup period following an election can stall for up the &lt;tt&gt;maxTimeMSOpOnly&lt;/tt&gt; timeout on the preceding &lt;tt&gt;replSetRequestVotes&lt;/tt&gt; op to due to a cancelled callback on a minority of voting members once the new primary reaches a majority of votes to be elected.&lt;/p&gt;

&lt;p&gt;This can cause socket exceptions for the connection pool between the primary and the minority members where the callback was cancelled, and blocks heartbeat sync during catchup with the primary until the original &lt;tt&gt;replSetRequestVotes&lt;/tt&gt; op timeout expires.&#160;&lt;/p&gt;

&lt;p&gt;This ultimately delays the elected primary from becoming ready to accept new writes for the duration the the op timeout, even though the election vote itself completes within a few milliseconds, as well as primary catchup period once the op timeout elapses.&lt;/p&gt;

&lt;p&gt;While disabling or configuring a low &lt;tt&gt;catchupTimeoutMillis&lt;/tt&gt; would unblock this scenario, it comes at the expense of increased rollback risk and is not a preferred option for some highly sensitive environments.&lt;/p&gt;

&lt;p&gt;It appears &lt;a href=&quot;https://github.com/10gen/mongo/blob/1ee5e8a02a528fa023d3e634d2f1d08d801644c2/src/mongo/db/repl/vote_requester.cpp#L119&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; that the op timeout for &lt;tt&gt;replSetRequestVotes&lt;/tt&gt; is based on the minimum value between &lt;tt&gt;maximumVoteRequestTimeoutMS&lt;/tt&gt;&#160;and &lt;tt&gt;electionTimeoutMillis&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;However, it seems &lt;tt&gt;maximumVoteRequestTimeoutMS&lt;/tt&gt; is a defined &lt;a href=&quot;https://github.com/10gen/mongo/blob/1ee5e8a02a528fa023d3e634d2f1d08d801644c2/src/mongo/db/repl/vote_requester.cpp#L62&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;constant&lt;/a&gt; of 30 seconds.&#160;&lt;/p&gt;

&lt;p&gt;I would anticipate that it be an superior option to promote faster failover for this scenario without having to lower the election timeout or skip the catchup period if &lt;tt&gt;maximumVoteRequestTimeoutMS&lt;/tt&gt; was a configurable timeout via a &lt;tt&gt;mongod&lt;/tt&gt; server param or replica-set setting&lt;/p&gt;</description>
                <environment></environment>
        <key id="2528531">SERVER-84297</key>
            <summary>Make maximumVoteRequestTimeoutMS a configurable setting</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="shane.smith@mongodb.com">Shane Smith</reporter>
                        <labels>
                            <label>Elections</label>
                    </labels>
                <created>Tue, 19 Dec 2023 14:52:36 +0000</created>
                <updated>Tue, 16 Jan 2024 15:21:53 +0000</updated>
                            <resolved>Tue, 16 Jan 2024 15:21:53 +0000</resolved>
                                    <version>5.0.12</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
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