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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-13805] [Atlas] Clarify meaning of nodeType:READ_ONLY</title>
                <link>https://jira.mongodb.org/browse/DOCS-13805</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;p&gt;In &lt;a href=&quot;https://docs.atlas.mongodb.com/reference/replica-set-tags/#replica-set-tag-descriptions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Replica Set Tag Descriptions&lt;/a&gt;, we describe &lt;tt&gt;nodeType&lt;/tt&gt; as having possible values of &lt;tt&gt;ELECTABLE&lt;/tt&gt;, &lt;tt&gt;READ_ONLY&lt;/tt&gt;, and &lt;tt&gt;ANALYTICS&lt;/tt&gt;. We should describe what each of these types means explicitly. Notably that &lt;tt&gt;nodeType:READ_ONLY&lt;/tt&gt; means a non-electable, read-only node as configured in the Atlas UI.&lt;/p&gt;

&lt;p&gt;Why is there confusion? My initial thought when I saw these node types is that an Analytics node is used for analytics and therefore would have the &lt;tt&gt;nodeType:ANALYTICS&lt;/tt&gt; applied to it. This is correct. An Analytics node cannot be written to (because it is not the primary nor can it ever be primary) and therefore should also have &lt;tt&gt;nodeType:READ_ONLY&lt;/tt&gt; applied to it. This is incorrect. By this line of reasoning, I had also expected electable secondaries to also be marked with &lt;tt&gt;nodeType:READ_ONLY&lt;/tt&gt;. Thinking it through, it doesn&apos;t make sense for Atlas to reconfigure tag sets based on election outcomes, but without knowing the inner workings of tag sets, it doesn&apos;t seem unreasonable at first glance for electable secondaries to be tagged with &lt;tt&gt;nodeType:READ_ONLY&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;In summary we should explicitly call out the following:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;nodeType:ELECTABLE&lt;/tt&gt; means an &quot;electable node for high availability&quot; as configured in the Atlas UI.&lt;br/&gt;
&lt;tt&gt;nodeType:READ_ONLY&lt;/tt&gt; means a &quot;read-only node for optimal local reads&quot; as configured in the Atlas UI.&lt;br/&gt;
&lt;tt&gt;nodeType:ANALYTICS&lt;/tt&gt; means an &quot;analytics node for workload isolation&quot; as configured in the Atlas UI.&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="1425744">DOCS-13805</key>
            <summary>[Atlas] Clarify meaning of nodeType:READ_ONLY</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="13201">Fixed</resolution>
                                        <assignee username="jeffrey.allen@mongodb.com">Jeffrey Allen</assignee>
                                    <reporter username="james.kovacs@mongodb.com">James Kovacs</reporter>
                        <labels>
                    </labels>
                <created>Fri, 31 Jul 2020 20:23:49 +0000</created>
                <updated>Sun, 29 Oct 2023 13:54:55 +0000</updated>
                            <resolved>Mon, 5 Oct 2020 14:48:00 +0000</resolved>
                                                                    <component>Atlas</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3425399" author="jeffrey.allen" created="Mon, 5 Oct 2020 14:46:58 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.kovacs&quot; class=&quot;user-hover&quot; rel=&quot;james.kovacs&quot;&gt;james.kovacs&lt;/a&gt;, we have a separate docs ticket for that update, DOCSP-12435, which is currently scheduled for this week&apos;s sprint. I&apos;m going to close this issue and we will handle the OPERATIONAL tag updates in the other ticket.&lt;/p&gt;</comment>
                            <comment id="3419265" author="jeffrey.allen" created="Wed, 30 Sep 2020 18:59:42 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=james.kovacs&quot; class=&quot;user-hover&quot; rel=&quot;james.kovacs&quot;&gt;james.kovacs&lt;/a&gt; thanks for filing this ticket. I just requested your review on a pull request which provides some clarification to the node types. Please see &lt;a href=&quot;https://github.com/10gen/cloud-docs/pull/1870&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/cloud-docs/pull/1870&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Thanks!&lt;/p&gt;</comment>
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