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    <title>MongoDB Jira</title>
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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-47206] Majority commit point is not set backward after force reconfig or reconfig that changes writeConcernMajorityJournalDefault</title>
                <link>https://jira.mongodb.org/browse/SERVER-47206</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47205&quot; title=&quot;Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47205&quot;&gt;&lt;del&gt;SERVER-47205&lt;/del&gt;&lt;/a&gt; describes why dropping snapshots after reconfig is ineffectual.&lt;/p&gt;

&lt;p&gt;The consequence is that until an operation is committed in the new config, majority reads will read at a timestamp that was committed under the old config.&#160;Writes are affected more narrowly. Any new operation that performs writes will wait to be committed under the new config. A write operation that does not write data (a noop write) will wait for the system last optime to be committed. If the system last optime is from before the reconfig, then the write is acknowledged when the data that was read is committed under the old config. This can only happen in a narrow interval, since we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b70908c4898c4b02d8c70df3f796fa3e8cfe5bdd/src/mongo/db/repl/repl_set_commands.cpp#L425-L436&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;write a noop oplog entry&lt;/a&gt; immediately after reconfig. In particular, operations on the same client thread as the reconfig will not be affected. However, it&#8217;s possible for a different thread to read the new config, then do a noop write with majority writeConcern, and have the write be acknowledged under the old config.&lt;/p&gt;

&lt;p&gt;Majority write acknowledgment after force reconfig is incorrect until the &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt; in the old config becomes majority-committed in the new config.&#160;Majority write acknowledgment after a safe reconfig that changes writeConcernMajorityJournalDefault is incorrect until the &lt;tt&gt;_currentCommitedSnapshot&lt;/tt&gt;&#160;in the old config becomes durable on a majority.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1298181">SERVER-47206</key>
            <summary>Majority commit point is not set backward after force reconfig or reconfig that changes writeConcernMajorityJournalDefault</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="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>
                    </labels>
                <created>Tue, 31 Mar 2020 13:35:07 +0000</created>
                <updated>Tue, 6 Dec 2022 02:31:15 +0000</updated>
                                            <version>3.6.17</version>
                    <version>4.2.5</version>
                    <version>4.0.17</version>
                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3027888" author="judah.schvimer" created="Mon, 6 Apr 2020 18:03:10 +0000"  >&lt;p&gt;This ticket should also improve the naming conventions around &apos;snapshots&apos; and ideally streamline the code around updating the commit point, stable timestamp, and current committed snapshot.&lt;/p&gt;</comment>
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                <issuelinks>
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                                        <issuelink>
            <issuekey id="1210361">SERVER-46516</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1293070">SERVER-47142</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="738780">SERVER-40649</issuekey>
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            <issuelink>
            <issuekey id="1298176">SERVER-47205</issuekey>
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