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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-80791] Potential data consistency issue with implicitly replicated collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-80791</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Implicitly replicated collections are a set of internal collections that participate in oplog replication partially by only replicating deletes. Inserts to these collections are implicit by other writes to potentially different collections.&lt;/p&gt;

&lt;p&gt;This behaviour however, can result in inconsistency during secondary oplog application. Suppose the following scenario:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;T1 writes to collA, which implicitly inserts to impA (implicitly replicated)&lt;/li&gt;
	&lt;li&gt;T2 deletes the insert performed to impA&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;In this case both T2 and T1 will be executed in parallel during oplog replication on the secondary if they are part of the same batch. This might lead to the delete operation being performed before the insert. As a result, the document will not exist on the primary but survive on the secondary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2435240">SERVER-80791</key>
            <summary>Potential data consistency issue with implicitly replicated collections</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="13203">Gone away</resolution>
                                        <assignee username="wei.hu@mongodb.com">Wei Hu</assignee>
                                    <reporter username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</reporter>
                        <labels>
                            <label>repl-shortlist</label>
                    </labels>
                <created>Wed, 6 Sep 2023 13:01:52 +0000</created>
                <updated>Wed, 10 Jan 2024 08:51:39 +0000</updated>
                            <resolved>Wed, 10 Jan 2024 08:51:39 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="5695123" author="judah.schvimer" created="Mon, 11 Sep 2023 18:09:41 +0000"  >&lt;p&gt;This appears to be a generalization of the problem of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-67962&quot; title=&quot;Applying config.image_collection deletes needs better concurrency control&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-67962&quot;&gt;&lt;del&gt;SERVER-67962&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="5682935" author="JIRAUSER1264163" created="Wed, 6 Sep 2023 13:21:07 +0000"  >&lt;p&gt;One potential solution could be to detect that an oplog entry is done on an implicitly replicated collection and process it individually on its own batch. We already seem to be doing something like this for some namespaces that make &lt;tt&gt;NamespaceString::mustBeAppliedInOwnOplogBatch&lt;/tt&gt; return true &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9d6e963d789fed2a778d4df07ac43e6da74d126/src/mongo/db/repl/oplog_batcher.cpp#L272&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="2526485">SERVER-84259</issuekey>
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