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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-13029] Note that arbiters will always return the previous version for FCV by design</title>
                <link>https://jira.mongodb.org/browse/DOCS-13029</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;For&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/#dbcmd.setFeatureCompatibilityVersion&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/command/setFeatureCompatibilityVersion/#dbcmd.setFeatureCompatibilityVersion&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37049&quot; title=&quot;MongoDB 3.6.7 arbiters continuously log &amp;quot;Using sessions while not fully upgraded to FCV3.6&amp;quot; even though replset is FCV3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37049&quot;&gt;&lt;del&gt;SERVER-37049&lt;/del&gt;&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37049?focusedCommentId=1996814&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-1996814&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;Tess wrote&lt;/a&gt;: &lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Arbiters always have the downgrade value of FCV, regardless of the FCV of the replica set. So if the arbiter has binary version 3.6, it will always have FCV=3.4. They never learn the FCV, since they do not replicate the&#160;&lt;tt&gt;admin.system.version&lt;/tt&gt;&#160;collection.&#160;Arbiters&apos; behavior is not allowed to depend on FCV for this reason.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;We should add a small section titled &quot;Arbiters&quot; to explain that this is expected behaviour since it can unexpected.&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="925707">DOCS-13029</key>
            <summary>Note that arbiters will always return the previous version for FCV by design</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="kenneth.dyer@mongodb.com">Kenneth Dyer</assignee>
                                    <reporter username="nicholas.cottrell@mongodb.com">Nic Cottrell</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Sep 2019 07:50:22 +0000</created>
                <updated>Mon, 30 Oct 2023 22:18:51 +0000</updated>
                            <resolved>Tue, 17 May 2022 20:45:54 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4554630" author="xgen-internal-githook" created="Tue, 17 May 2022 20:44:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kenneth P. J. Dyer&apos;, &apos;email&apos;: &apos;93145796+kennethdyer@users.noreply.github.com&apos;, &apos;username&apos;: &apos;kennethdyer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Backport to 4.4 (#1131)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/72c83b7dfa42c7115f3cf146ce6c70eb182c6890&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/72c83b7dfa42c7115f3cf146ce6c70eb182c6890&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4554629" author="xgen-internal-githook" created="Tue, 17 May 2022 20:44:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kenneth P. J. Dyer&apos;, &apos;email&apos;: &apos;93145796+kennethdyer@users.noreply.github.com&apos;, &apos;username&apos;: &apos;kennethdyer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Backport to v4.2 (#1134)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/2ee93463c17d4368f7330bb40d552282ff0243fd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/2ee93463c17d4368f7330bb40d552282ff0243fd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4554628" author="xgen-internal-githook" created="Tue, 17 May 2022 20:44:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kenneth P. J. Dyer&apos;, &apos;email&apos;: &apos;93145796+kennethdyer@users.noreply.github.com&apos;, &apos;username&apos;: &apos;kennethdyer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Cherry Pick/Merge (#1130)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/d0b413107316232969fb01ee34088ec0091de581&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/d0b413107316232969fb01ee34088ec0091de581&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4554624" author="xgen-internal-githook" created="Tue, 17 May 2022 20:44:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kenneth P. J. Dyer&apos;, &apos;email&apos;: &apos;93145796+kennethdyer@users.noreply.github.com&apos;, &apos;username&apos;: &apos;kennethdyer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; cherry pick merge (#1126)&lt;br/&gt;
Branch: v5.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/0cfbd05ae5ed05f0324603b4882aa1a5e1125c92&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/0cfbd05ae5ed05f0324603b4882aa1a5e1125c92&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4550296" author="xgen-internal-githook" created="Mon, 16 May 2022 16:20:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kenneth P. J. Dyer&apos;, &apos;email&apos;: &apos;93145796+kennethdyer@users.noreply.github.com&apos;, &apos;username&apos;: &apos;kennethdyer&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Adds Arbiter FCV section (#1098)&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Adds Arbiter FCV section&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Sets up an include file&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; version test&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Compatibility text for includes&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Compatibility text for includes&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Compatibility text for includes&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Compatibility text for includes&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Compatibility text&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Compatibility text&lt;/li&gt;
&lt;/ul&gt;


&lt;ul&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13029&quot; title=&quot;Note that arbiters will always return the previous version for FCV by design&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13029&quot;&gt;&lt;del&gt;DOCS-13029&lt;/del&gt;&lt;/a&gt; Fixes per Dave&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/d3737e8a4de326bc0c9d99ecfd7ed00985eea8f0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/d3737e8a4de326bc0c9d99ecfd7ed00985eea8f0&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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