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    <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-47009] Bypass replica set config commitment safety checks if voting member set doesn&apos;t change</title>
                <link>https://jira.mongodb.org/browse/SERVER-47009</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If we execute a reconfig from C1 =&amp;gt; C2, and then try to execute a reconfig from C2 =&amp;gt; C3, we must ensure that all ops committed in configs prior to C2 are committed in C2 and that C2 is committed before moving to C3. If C3, however, doesn&apos;t actually change the voting member set of the config, we can bypass the safety checks when moving from C2 =&amp;gt; C3, since the config is essentially a no-op with respect to member set changes. The next time we do a reconfig that changes the voting member set, we will make sure the safety checks are satisfied. This ensures that all previously committed ops and configs are committed before moving to a config with different members. &lt;/p&gt;

&lt;p&gt;This is an optimization that could make certain reconfigs less costly since they won&apos;t need to wait for oplog commitment or config replication. For example, changing the election timeout or changing the priority of a node.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1283486">SERVER-47009</key>
            <summary>Bypass replica set config commitment safety checks if voting member set doesn&apos;t change</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                            <label>safe-reconfig-related</label>
                    </labels>
                <created>Fri, 20 Mar 2020 14:13:18 +0000</created>
                <updated>Tue, 6 Dec 2022 02:32:25 +0000</updated>
                            <resolved>Mon, 13 Apr 2020 17:27:30 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3012314" author="siyuan.zhou@10gen.com" created="Mon, 30 Mar 2020 05:38:19 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=william.schultz&quot; class=&quot;user-hover&quot; rel=&quot;william.schultz&quot;&gt;william.schultz&lt;/a&gt;, this sounds correct to me. I agree the fact that the new config is essentially a no-op in config consensus means it&apos;s safe in terms of the config consensus, but it&apos;s not obvious to me why it doesn&apos;t affect the safety of data consensus. At least, I think we need to update our definition of the two rules of safety: Oplog Commitment and maybe Config Replication and run model checking for the change.&lt;/p&gt;</comment>
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