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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>[SERVER-32729] Bump the replica set heartbeat version so a latest-FCV primary does not attempt to talk to a last-stable binary secondary</title>
                <link>https://jira.mongodb.org/browse/SERVER-32729</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For the 3.6 release cycle, we bumped the replica set heartbeat version so a latest-FCV primary wouldn&apos;t think a last-stable binary version secondary was healthy (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;). The heartbeat version should be similarly bumped for 3.8.&lt;/p&gt;</description>
                <environment></environment>
        <key id="483638">SERVER-32729</key>
            <summary>Bump the replica set heartbeat version so a latest-FCV primary does not attempt to talk to a last-stable binary secondary</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Jan 2018 22:40:08 +0000</created>
                <updated>Thu, 25 Jan 2018 21:35:47 +0000</updated>
                            <resolved>Thu, 25 Jan 2018 21:00:56 +0000</resolved>
                                                                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1785338" author="dianna.hohensee" created="Thu, 25 Jan 2018 21:00:30 +0000"  >&lt;p&gt;The temporarily addition of heartbeat version for v3.6 works because v3.4 validates that no unexpected fields are sent. So v3.6 nodes do no heartbeat version checking, they simply send it. This won&apos;t work for v3.8, because v3.6 expects it. Therefore simply bumping the version will not be sufficient: a check would need to be added.&lt;/p&gt;

&lt;p&gt;In light of this, we are not going to bump the version and add checks. We&apos;ll simply wait for &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; to resolve this. I believe multiVersion/feature_compatibility_version_lagging_secondary.js is the only test for this. It still passes because it&apos;s explicitly using a v3.4 binary node with latest binary replica set. Adding a note to &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; to update the test, so it becomes relevant again, and closing this ticket.&lt;/p&gt;</comment>
                            <comment id="1781227" author="dianna.hohensee" created="Mon, 22 Jan 2018 20:05:44 +0000"  >&lt;p&gt;Must be done after &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32412&quot; title=&quot;Add featureCompatibilityVersion 4.0 to the list of valid featureCompatibility values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32412&quot;&gt;&lt;del&gt;SERVER-32412&lt;/del&gt;&lt;/a&gt;, so that we have FCV versions greater than 3.6 on which to use the new heartbeat version.&lt;/p&gt;</comment>
                            <comment id="1780809" author="dianna.hohensee" created="Mon, 22 Jan 2018 16:29:16 +0000"  >&lt;p&gt;Latest and last-stable binary nodes are unable to communicate due to internal wireVersion requirements. A FCV upgraded latest binary will have a range of &lt;/p&gt;
{LATEST_WIRE_VERSION, LATEST_WIRE_VERSION}
&lt;p&gt;, whereas a last-stable binary will &lt;/p&gt;
{LATEST_WIRE_VERSION - 1, LATEST_WIRE_VERSION - 1}
&lt;p&gt;, and no range overlap causes a IncompatibleServerVersion error.&lt;/p&gt;

&lt;p&gt;The only situation where mixed version replica set members can continue to communicate is on connections established before FCV was upgraded on the latest binary nodes. We already track and close incoming connections from last-stable binaries on upgrade. &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 eventually close outgoing connections.&lt;/p&gt;

&lt;p&gt;This ticket will be done to hold us over until &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; in unblocked and completed.&lt;/p&gt;</comment>
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                    <name>Gantt Dependency</name>
                                                                <inwardlinks description="has to be done after">
                                        <issuelink>
            <issuekey id="474425">SERVER-32412</issuekey>
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            <issuekey id="481194">SERVER-32636</issuekey>
        </issuelink>
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