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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-26226] Disallow replica set configurations with 3 nodes, one arbiter, priorities greater than 1, and protocol version 1</title>
                <link>https://jira.mongodb.org/browse/SERVER-26226</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Typically, users running a 3 node replica set with one arbiter will use w:1 writes instead of w:majority writes, since the cluster loses quorum after one node fails.  Any writes taking place on a degraded cluster with only one data-bearing node carry the risk of losing those writes.&lt;br/&gt;
In particular, rollback can occur after the cluster is healed, by returning the second data-bearing node to the cluster. At this point, under pv1, priority takeover can roll back all writes done during the degraded state.  Protocol version 0 priority takeover, however, can roll back up to 10 seconds of writes.  &lt;/p&gt;

&lt;p&gt;Due to the potential size of the rollback, and the unexpectedness of the behavior, we propose to prohibit the configuration of 3 nodes, 1 arbiter, priorities higher than 1, and protocol version 1.  Upon parsing of such a configuration, we should degrade to protocol version 0, and add a warning to the system log.&lt;/p&gt;</description>
                <environment></environment>
        <key id="317941">SERVER-26226</key>
            <summary>Disallow replica set configurations with 3 nodes, one arbiter, priorities greater than 1, and protocol version 1</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="9">Done</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="milkie@mongodb.com">Eric Milkie</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Sep 2016 19:59:04 +0000</created>
                <updated>Tue, 6 Dec 2022 04:16:11 +0000</updated>
                            <resolved>Mon, 31 Oct 2016 21:16:38 +0000</resolved>
                                    <version>3.2.9</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="1422320" author="spencer" created="Mon, 31 Oct 2016 21:16:31 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26748&quot; title=&quot;Don&amp;#39;t call for priority takeover when repl lagged&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26748&quot;&gt;&lt;del&gt;SERVER-26748&lt;/del&gt;&lt;/a&gt; eliminates the need for this&lt;/p&gt;</comment>
                            <comment id="1396600" author="milkie" created="Thu, 29 Sep 2016 14:33:16 +0000"  >&lt;p&gt;To expedite work on this, we may first simply implement warnings for this situation, and then follow up with prohibiting reconfigs that introduce an illegal configuration.&lt;/p&gt;</comment>
                            <comment id="1390265" author="schwerin" created="Wed, 21 Sep 2016 20:04:13 +0000"  >&lt;p&gt;If we do this, I&apos;d also like explicit reconfigs and initiates to fail if they involve an illegal configuration.&lt;/p&gt;</comment>
                            <comment id="1390261" author="schwerin" created="Wed, 21 Sep 2016 20:03:27 +0000"  >&lt;p&gt;Should we just prohibit arbiters in PV1 entirely?&lt;/p&gt;</comment>
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