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    <title>MongoDB Jira</title>
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    <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-78382] Verify whether primary step down would occur when changing secondary tags</title>
                <link>https://jira.mongodb.org/browse/SERVER-78382</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The Atlas team is considering using replication tags in Atlas to label nodes as &quot;operational&quot; or &quot;warming&quot;. When a new node is added, the disk is available immediately, but it&apos;s slow. Today we warm it slowly and make the node available immediately. In the future, we want to make the node unavailable for secondary reads until the warming is complete and full performance is achieved. A replica set tag would be used when:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;when customers add a new node on Atlas&lt;/li&gt;
	&lt;li&gt;when a node falls off and a new node is added as a replacement.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The affected node would use a special RS tag to indicate it is &lt;tt&gt;warming&lt;/tt&gt; until it is warmed.&lt;/p&gt;

&lt;p&gt;&#160;&lt;br/&gt;
According to our Docs, changing a replica set tag &lt;em&gt;can&lt;/em&gt;&#160;trigger a&#160;&lt;a href=&quot;https://www.mongodb.com/docs/manual/reference/method/rs.reconfig/#availability&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;primary step down&lt;/a&gt;. While the operation is relatively rare, this could introduce unnecessary elections.&lt;br/&gt;
We would like to verify whether the primary step down is likely to occur in the above scenario.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2375704">SERVER-78382</key>
            <summary>Verify whether primary step down would occur when changing secondary tags</summary>
                <type id="17000" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14713&amp;avatarType=issuetype">Engineering Test</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="9">Done</resolution>
                                        <assignee username="alek.antoniewicz@mongodb.com">Alek Antoniewicz</assignee>
                                    <reporter username="alek.antoniewicz@mongodb.com">Alek Antoniewicz</reporter>
                        <labels>
                            <label>repl-shortlist</label>
                    </labels>
                <created>Fri, 23 Jun 2023 13:55:13 +0000</created>
                <updated>Wed, 12 Jul 2023 19:29:13 +0000</updated>
                            <resolved>Wed, 12 Jul 2023 19:29:13 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5561681" author="alek.antoniewicz" created="Wed, 12 Jul 2023 19:28:51 +0000"  >&lt;p&gt;Excellent, thank you for confirming &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matthew.russotto%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;matthew.russotto@mongodb.com&quot;&gt;matthew.russotto@mongodb.com&lt;/a&gt;!&lt;br/&gt;
I believe we have all we need. Closing&lt;/p&gt;</comment>
                            <comment id="5558987" author="matthew.russotto" created="Tue, 11 Jul 2023 21:44:06 +0000"  >&lt;p&gt;Step down due to reconfiguration occurs when the current primary is not a valid primary in the new configuration.  Currently this will happen if the primary is removed or if its priority is set to 0.  Reconfiguration resulting in step-down is only allowed when &lt;/p&gt;
{force: true}
&lt;p&gt; is set.&lt;/p&gt;

&lt;p&gt;It is also possible to get an election due to reconfiguration because of priority takeover (if priorities are changed) or because the change resulted loss of majority of the set (only with &lt;/p&gt;
{force: true}
&lt;p&gt;), but these technically happen after the reconfig&lt;/p&gt;

&lt;p&gt;Just changing node tags without &lt;/p&gt;
{force: true}
&lt;p&gt; should not result in elections.&lt;/p&gt;</comment>
                            <comment id="5521067" author="alek.antoniewicz" created="Fri, 23 Jun 2023 13:58:51 +0000"  >&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=alan.zheng%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;alan.zheng@mongodb.com&quot;&gt;alan.zheng@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=judah.schvimer%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;judah.schvimer@mongodb.com&quot;&gt;judah.schvimer@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kevin.pytlar%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kevin.pytlar@mongodb.com&quot;&gt;kevin.pytlar@mongodb.com&lt;/a&gt; &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jianling.liu%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jianling.liu@mongodb.com&quot;&gt;jianling.liu@mongodb.com&lt;/a&gt;&#160;&lt;/p&gt;</comment>
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