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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-36026] Replica set member should fail to parse heartbeat response with unknown fields</title>
                <link>https://jira.mongodb.org/browse/SERVER-36026</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Replica set members ignore any unknown fields in heartbeat responses. We should check for unknown fields, so that in the future, if we add a field to the heartbeat response, it is not silently ignored on older-version nodes. This would be consistent with heartbeat request parsing, where we error if there is an unknown field.&lt;/p&gt;</description>
                <environment></environment>
        <key id="569309">SERVER-36026</key>
            <summary>Replica set member should fail to parse heartbeat response with unknown fields</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="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>former-quick-wins</label>
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                <created>Mon, 9 Jul 2018 15:54:49 +0000</created>
                <updated>Tue, 6 Dec 2022 03:24:31 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1959399" author="siyuan.zhou@10gen.com" created="Sun, 29 Jul 2018 01:28:06 +0000"  >&lt;p&gt;Removing fields will also need more work. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35953&quot; title=&quot;Remove &amp;quot;hbmsg&amp;quot; field from heartbeat response message.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35953&quot;&gt;&lt;del&gt;SERVER-35953&lt;/del&gt;&lt;/a&gt; removed &quot;hbmsg&quot; field of heartbeat responses. In 4.0, we always send an empty string for &quot;hbmsg&quot; field in heartbeat response. �This ticket or &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36335&quot; title=&quot;Use IDL to parse heartbeat response message.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36335&quot;&gt;SERVER-36335&lt;/a&gt; will have to accept the unused &quot;hbmsg&quot; field as &quot;optional&quot; and we can eventually remove it in 4.4.&lt;/p&gt;

&lt;p&gt;I understand the risk of ignoring unknown fields, but I cannot think of a case of internal messages where it caused us a problem to justify the extra complexity. &lt;a href=&quot;https://developers.google.com/protocol-buffers/docs/overview&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Protobuf&lt;/a&gt; also ignores unknown fields.&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;You can add new fields to your message formats without breaking backwards-compatibility; old binaries simply ignore the new field when parsing.&lt;/p&gt;&lt;/blockquote&gt;</comment>
                            <comment id="1942476" author="tess.avitabile" created="Mon, 9 Jul 2018 21:09:14 +0000"  >&lt;p&gt;Yes. However, we can use FCV to decide whether to include new fields. And this would ensure we weren&apos;t expecting older version nodes to do something with the new field.&lt;/p&gt;</comment>
                            <comment id="1942364" author="bruce.lucas@10gen.com" created="Mon, 9 Jul 2018 19:56:46 +0000"  >&lt;p&gt;Could this potentially cause unnecessary compatibility problems for mixed version replica sets during upgrade?&lt;/p&gt;</comment>
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