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    <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-22572] readConcern majority doesn&apos;t consider replica-set changes</title>
                <link>https://jira.mongodb.org/browse/SERVER-22572</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It would appear the only reason to throw away the set of snapshots used for readConcern is if the local node enters ROLLBACK:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f8dadcefeef7e738d7063ae2df57b9c856b402da/src/mongo/db/repl/replication_coordinator_impl.cpp#L2518&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/f8dadcefeef7e738d7063ae2df57b9c856b402da/src/mongo/db/repl/replication_coordinator_impl.cpp#L2518&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Replica-set reconfigs would seem to be another way to change the conditions needed to fulfill readConcern majority. For example, in a 5-member replica-set where 2 members are non-voting requires only 2 of the voting members to fulfill a majority readConcern. Reconfig to allow the other 2 members to vote means the set should now demand 3 members to achieve readConcern majority. However, the existing &apos;verified&apos; snapshot on all members would continue to be used for this purpose despite it (not necessarily) fulfilling the current requirements.&lt;/p&gt;</description>
                <environment></environment>
        <key id="264593">SERVER-22572</key>
            <summary>readConcern majority doesn&apos;t consider replica-set changes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="scotthernandez">Scott Hernandez</assignee>
                                    <reporter username="andrew.ryder@mongodb.com">Andrew Ryder</reporter>
                        <labels>
                    </labels>
                <created>Thu, 11 Feb 2016 03:23:13 +0000</created>
                <updated>Thu, 14 Apr 2016 15:17:47 +0000</updated>
                            <resolved>Sun, 27 Mar 2016 20:22:01 +0000</resolved>
                                    <version>3.2.1</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1216366" author="scotthernandez" created="Sun, 27 Mar 2016 20:22:01 +0000"  >&lt;p&gt;Snapshots are dropping now, due to changes in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-23010&quot; title=&quot;Committed Snapshot Meaning Incorrect&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-23010&quot;&gt;&lt;del&gt;SERVER-23010&lt;/del&gt;&lt;/a&gt;. The behavior you want is now available for the next release.&lt;/p&gt;</comment>
                            <comment id="1188082" author="milkie" created="Mon, 29 Feb 2016 19:11:51 +0000"  >&lt;p&gt;Dropping all snapshots on a reconfig is easy, so to clear up any questions, we will do such.&lt;/p&gt;</comment>
                            <comment id="1170537" author="milkie" created="Thu, 11 Feb 2016 13:34:38 +0000"  >&lt;p&gt;Another way to think about it is that the read concern level majority view is a view that reflects writes that will never roll back.  Since it is possible to have writes reflected in a committed-view snapshot roll back after a reconfig, perhaps we should just drop all snapshots after a reconfig to ensure the integrity of the guarantee.  It wouldn&apos;t be a hard change to make.&lt;/p&gt;</comment>
                            <comment id="1170207" author="scotthernandez" created="Thu, 11 Feb 2016 03:55:44 +0000"  >&lt;p&gt;This sounds more like an enhancement or feature request, not a bug.&lt;/p&gt;

&lt;p&gt;When the WriteConcern.Majority confirmation for the write was sent to the client it was for a certain configuration, and number representing the &quot;majority&quot;. If the config changes, then that will affect future writes, not ones from the past.&lt;/p&gt;

&lt;p&gt;Since ReadConcern.Majority only ensure your reads were from a previous WriteConcen.Majority point, it sounds like it works exactly the same.&lt;/p&gt;

&lt;p&gt;ReadConcern.Majority is not about the current &quot;number&quot; of the majority, but about the state of an acknowledged &quot;majority&quot; write, and the configuration at that point.&lt;/p&gt;</comment>
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