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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-14234] Majority mode for oplog tailable cursor</title>
                <link>https://jira.mongodb.org/browse/SERVER-14234</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When systems like mongo-connector tail the oplog, it would be useful to be able to have the cursor tail the watermark reflecting the majority of the cluster, rather than the latest operation in the current nodes oplog. Thus the cursor would only return an oplog entry to the caller once a majority of replicas had processed the oplog entry. This would mean that rollbacks would only need to be handled by the app in the case of catastrophic failures where more than a majority of the cluster was lost rather than on every failover that happens. &lt;/p&gt;</description>
                <environment></environment>
        <key id="141663">SERVER-14234</key>
            <summary>Majority mode for oplog tailable cursor</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="jsr">Jared Rosoff</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Jun 2014 22:58:26 +0000</created>
                <updated>Tue, 6 Dec 2022 05:04:53 +0000</updated>
                            <resolved>Thu, 21 Apr 2016 12:06:09 +0000</resolved>
                                                    <fixVersion>3.2.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>2</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1242307" author="milkie" created="Thu, 21 Apr 2016 12:06:09 +0000"  >&lt;p&gt;readConcern level majority was released in version 3.2.&lt;/p&gt;</comment>
                            <comment id="682650" author="henrik.ingo@10gen.com" created="Wed, 6 Aug 2014 13:27:49 +0000"  >&lt;p&gt;In other words, you&apos;re asking for a &quot;ReadConcern&quot; of w:majority, when tailing the oplog.&lt;/p&gt;

&lt;p&gt;Note that the Raft protocol includes the state variable &lt;tt&gt;commitIndex&lt;/tt&gt;, which is the position of the last operation received by a majority of nodes. (A Raft commit therefore is essentially a MongoDB w:majority commit.) Hence, implementing this ticket would be straightforward with a Raft like replication algorithm.&lt;/p&gt;</comment>
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