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    <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-84760] Violation of transaction snapshot isolation when collection concurrently dropped</title>
                <link>https://jira.mongodb.org/browse/SERVER-84760</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On versions earlier than v7.0, there&apos;s the following anomaly on transactions with snapshot read concern. Consider the following scenario:&lt;br/&gt;
1. Insert two docs to coll1&lt;br/&gt;
2. Insert one doc to coll2&lt;br/&gt;
3. Start transaction with snapshot read concern and read from coll1. Expect to see 2 docs.&lt;br/&gt;
4. Outside the transaction, insert a third doc to coll1.&lt;br/&gt;
5. Outside the transaction, drop coll2.&lt;br/&gt;
6. Within the transaction, read coll2. Expect to see 1 doc. But it sees 0 (as if coll2 does not exist)&lt;/p&gt;

&lt;p&gt;This is a violation of snapshot isolation because there never existed a snapshot where coll1 had 2 documents but coll2 didn&apos;t exist.&lt;/p&gt;

&lt;p&gt;The same can happen exchanging &apos;drop&apos; by &apos;rename&apos;.&lt;/p&gt;

&lt;p&gt;This does not reproduce on v7.0 and later thanks to PM-2218.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2543308">SERVER-84760</key>
            <summary>Violation of transaction snapshot isolation when collection concurrently dropped</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="10018" iconUrl="https://jira.mongodb.org/images/icons/statuses/visible.png" description="">In Code Review</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
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                <created>Thu, 11 Jan 2024 15:09:24 +0000</created>
                <updated>Tue, 6 Feb 2024 16:55:04 +0000</updated>
                                            <version>4.4.0</version>
                    <version>5.0.0</version>
                    <version>6.0.0</version>
                                    <fixVersion>5.0 Required</fixVersion>
                    <fixVersion>4.4 Required</fixVersion>
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            <issuekey id="2541863">SERVER-84723</issuekey>
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