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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-39001] Allow majority read concern for replication for backup node use-case</title>
                <link>https://jira.mongodb.org/browse/SERVER-39001</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;One common configuration is to have a non-voting, hidden backup node.  One would then take e.g. hourly filesystem or EBS snapshots of the node.  One potential issue with this approach is that it&apos;s possible that a backup snapshot might wind up with data that is rolled back, e.g. if the primary fails at the same time a s apshot is taken.  One approach to address this is to use delayed replication of e.g. 5 min, and hope that is sufficient to avoid observing the rollback (I&apos;m not sure of the oplog is fixed up during a rollback or not, so perhaps this isn&apos;t actually sufficient).  Instead, a more robust solution would be to allow the backup node&apos;s replication thread/query to use read concern majority.  Presumably this would require that you set the node to priority 0/hidden, the same restrictions on delayed replication.&lt;/p&gt;</description>
                <environment></environment>
        <key id="672483">SERVER-39001</key>
            <summary>Allow majority read concern for replication for backup node use-case</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="bartle">David Bartley</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Jan 2019 04:41:02 +0000</created>
                <updated>Tue, 6 Dec 2022 03:08:11 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>16</watches>
                                                                                                                <comments>
                            <comment id="3052237" author="bartle" created="Thu, 23 Apr 2020 05:51:04 +0000"  >&lt;p&gt;Another place where this could be useful is to recover from poisoned oplog entries that cause all secondaries to crash loop.&lt;/p&gt;</comment>
                            <comment id="2785593" author="bartle" created="Wed, 5 Feb 2020 20:01:16 +0000"  >&lt;p&gt;We&apos;d typically either run a mongod standalone against the snapshot (e.g. to pull historic data, or to validate something in our ETL pipeline), or would bring up a replset with each member running against the snapshot.  I don&apos;t think we&apos;d ever restore a single node in an existing replset off of a snapshot, though, which I agree would trigger a rollback if necessary.&lt;/p&gt;</comment>
                            <comment id="2785103" author="alyson.cabral" created="Wed, 5 Feb 2020 16:59:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bartle&quot; class=&quot;user-hover&quot; rel=&quot;bartle&quot;&gt;bartle&lt;/a&gt; Hey Bartle, is this a case where you&apos;re using backups for compliance? I just want to clarify that once a backup is restored to a node, that node will undergo rollback if necessary. &lt;/p&gt;</comment>
                            <comment id="2116400" author="daniel.hatcher" created="Tue, 15 Jan 2019 22:36:43 +0000"  >&lt;p&gt;Hello David,&lt;/p&gt;

&lt;p&gt;Thank you for your report. I have assigned this ticket to our Replication team to take a look.&lt;/p&gt;

&lt;p&gt;Danny&lt;/p&gt;</comment>
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