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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47189] Do a safe reconfig to add config term on upgrade to FCV=4.4</title>
                <link>https://jira.mongodb.org/browse/SERVER-47189</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When replica set nodes are in FCV=4.2, their replica set configs have no config &quot;term&quot; field. This is intentional so that the behavior in FCV=4.2 matches the v4.2 reconfig behavior. After upgrading to FCV=4.4, however, replica set nodes will not add a config term until the first safe reconfig is run. This can leave an indefinitely long period of time where nodes will have configs with uninitialized terms, which is unsafe for the reasons illustrated in the &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47119?focusedCommentId=3003712&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-3003712&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;trace of this comment&lt;/a&gt;. To prevent this unsafe period of time after upgrade, we should do an internal no-op reconfig after upgrading to FCV=4.4 to automatically add config terms, analogous to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/dc7724efa185a1b64f95fc84d0f7794dbc2fcdae/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L256-L292&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;what we do on FCV downgrade&lt;/a&gt;. &lt;/p&gt;</description>
                <environment></environment>
        <key id="1297426">SERVER-47189</key>
            <summary>Do a safe reconfig to add config term on upgrade to FCV=4.4</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                    </labels>
                <created>Mon, 30 Mar 2020 19:42:15 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:11 +0000</updated>
                            <resolved>Fri, 10 Apr 2020 21:47:15 +0000</resolved>
                                                    <fixVersion>4.4.0-rc1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3035623" author="xgen-internal-githook" created="Fri, 10 Apr 2020 21:14:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47189&quot; title=&quot;Do a safe reconfig to add config term on upgrade to FCV=4.4&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47189&quot;&gt;&lt;del&gt;SERVER-47189&lt;/del&gt;&lt;/a&gt; Do a reconfig on upgrade to FCV 4.4 to add a config term&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/880dd3e91f5b38105d909072d8d036378575d93d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/880dd3e91f5b38105d909072d8d036378575d93d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1326431">DOCS-13610</issuekey>
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            <issuekey id="1290834">SERVER-47119</issuekey>
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                            <customfieldvalue>On upgrade to 4.4 starting from RC1, the primary executes a similar reconfig to add the term field from the on-disk config document and blocks waiting for only a majority of the nodes to replicate the new config. This is sufficient to guarantee the new on-disk format will eventually propagate to all nodes and the next primary must have the new on-disk format. This is an optimization to avoid potential safety issues on the later transition from 4.2-style config to safe reconfig.</customfieldvalue>

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