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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32911] Remove heartbeat version field, &quot;hbv&quot;, from the heartbeat command once outgoing connections to last-stable binaries are closed on FCV upgrade</title>
                <link>https://jira.mongodb.org/browse/SERVER-32911</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The heartbeat version field was added in v3.6 to stop communication with v3.4 nodes when FCV 3.6 is set. v3.6 do so by adding a &quot;hbv&quot; field to heartbeat requests, which v3.4 nodes receive and validate that no unexpected fields are present in the request &amp;#8211; v3.4 does not expect &apos;hbv&apos;, so it fails the command.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32636&quot; title=&quot;Close outgoing connections to servers running the last-stable binary version on setFeatureCompatibilityVersion to the latest featureCompatibilityVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32636&quot;&gt;&lt;del&gt;SERVER-32636&lt;/del&gt;&lt;/a&gt; will close outgoing connections to old binary nodes on FCV upgrade. v3.8 (like v3.6) nodes will be unable to establish connections with older nodes once FCV is upgraded. Closing outgoing connections on FCV upgrade closes the loophole of v3.8 and v3.6 nodes continuing to communicate via previously established connections, and the heartbeat version check will be no longer needed.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31631&quot; title=&quot;Bump minimum outgoing wire version for mongod when featureCompatibilityVersion is 3.6&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31631&quot;&gt;&lt;del&gt;SERVER-31631&lt;/del&gt;&lt;/a&gt; for history of heartbeat version.&lt;/p&gt;</description>
                <environment>&lt;br/&gt;
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        <key id="487556">SERVER-32911</key>
            <summary>Remove heartbeat version field, &quot;hbv&quot;, from the heartbeat command once outgoing connections to last-stable binaries are closed on FCV upgrade</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Thu, 25 Jan 2018 22:16:51 +0000</created>
                <updated>Tue, 6 Dec 2022 03:40:07 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1818911" author="dianna.hohensee" created="Wed, 28 Feb 2018 18:45:29 +0000"  >&lt;p&gt;Currently the &apos;hbv&apos; field is effecting nothing. Both v4.0 and v3.6 mongods send and receive the field, and nothing errors.&lt;/p&gt;

&lt;p&gt;The field should be removed eventually since it&apos;s not performing any function. However, it&apos;s totally benign in the meantime. May need some kind of backwards compatible removal over two releases.&lt;/p&gt;

&lt;p&gt;Moving the ticket over to replication to remove eventually. Probably backlog worthy to wait for the next new replication engineer.&lt;/p&gt;</comment>
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