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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>[DOCS-13929] Investigate changes in SERVER-43904: When stepping down, step up doesn&apos;t filter out frozen nodes</title>
                <link>https://jira.mongodb.org/browse/DOCS-13929</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    I&apos;m not sure if we track what heartbeats consist of, sorry if this doesn&apos;t actually need downstream team attention!&lt;/p&gt;

&lt;p&gt;I added a heartbeat field, &apos;electable&apos;, to heartbeat responses. This tells the heartbeat response recipient if the node is electable to be primary or not. If a node has &apos;electable&apos; set to false, when the primary looks for a secondary to step up during election handoff, it will skip choosing that node as the new primary (since it is not electable)&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;
&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    One of the recommended ways &lt;span class=&quot;error&quot;&gt;&amp;#91;0&amp;#93;&lt;/span&gt; to force a particular node to become primary is to freeze all non-candidate nodes and then call replSetStepDown on the primary.  As of MongoDB 3.6, that code attempts to step up a candidate (by calling replSetStepUp).  However, that code doesn&apos;t exclude frozen nodes, and attempting to step up a frozen node will simply fail (&quot;2019-10-09T00:24:05.517+0000 I REPL     &lt;span class=&quot;error&quot;&gt;&amp;#91;conn352334&amp;#93;&lt;/span&gt; Not starting an election for a replSetStepUp request, since we are not electable due to: Not standing for election because I am still waiting for stepdown period to end at 2019-10-09T00:33:59.473+0000 (mask 0x20)&quot;).  This isn&apos;t particularly bad, since the unfrozen node will actually call for, and win, an election, but it does make failovers slower (up to electionTimeoutMillis slower, presumably).&lt;/p&gt;

&lt;p&gt;An alternative approach that we&apos;re using, that isn&apos;t explicitly documented, is to increase the priority of both the current and candidate node, and then run replSetStepDown.  I&apos;ve verified both in code and logs that this is effective at getting mongo to step up the candidate node consistently.  It might be nice to document this approach, since I think it offers improvements over both approaches currently mentioned.  Increasing the priority on just the candidate works, but tends to be slower since the &quot;priority takeover&quot; mechanism takes a few seconds to trigger, and provides less control than an explicit replSetStepDown.&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;0&amp;#93;&lt;/span&gt; &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/force-member-to-be-primary/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/tutorial/force-member-to-be-primary/&lt;/a&gt;&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1512909">DOCS-13929</key>
            <summary>Investigate changes in SERVER-43904: When stepping down, step up doesn&apos;t filter out frozen nodes</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="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Oct 2020 17:17:24 +0000</created>
                <updated>Mon, 13 Nov 2023 18:02:10 +0000</updated>
                            <resolved>Mon, 19 Jul 2021 18:46:09 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.4</fixVersion>
                    <fixVersion>4.0.23</fixVersion>
                    <fixVersion>4.2.13</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3950304" author="jeffrey.allen" created="Mon, 19 Jul 2021 18:46:09 +0000"  >&lt;p&gt;Closing this ticket since we don&apos;t document the specific elements of heartbeats.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="1580102">DOCS-14074</issuekey>
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            <issuekey id="1590514">DOCS-14127</issuekey>
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