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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-79437] Providing an explicit atClusterTime with read concern snapshot in a transaction can violate snapshot isolation.</title>
                <link>https://jira.mongodb.org/browse/SERVER-79437</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Updated title + more context from &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=max.hirschhorn%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;max.hirschhorn@mongodb.com&quot;&gt;max.hirschhorn@mongodb.com&lt;/a&gt;&apos;s &lt;a href=&quot;https://jira.mongodb.org/browse/BF-29391?focusedCommentId=5593652&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-5593652&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;comment&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&lt;cite&gt;While the manifestation a --dbg=on build variant would be the for mongos process to crash, in a production system, a client which had specified {readConcern: {level: &quot;snapshot&quot;, atClusterTime: T1}} as the transaction read concern would have used a different timestamp T2 &amp;gt; T1 when starting the transaction on later participants. This would result in different participants using different read timestamps for the cross-shard transaction and violate snapshot isolation.&lt;/cite&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2403229">SERVER-79437</key>
            <summary>Providing an explicit atClusterTime with read concern snapshot in a transaction can violate snapshot isolation.</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="5">Cannot Reproduce</resolution>
                                        <assignee username="backlog-server-sharding-nyc">[DO NOT USE] Backlog - Sharding NYC</assignee>
                                    <reporter username="kshitij.gupta@mongodb.com">Kshitij Gupta</reporter>
                        <labels>
                            <label>sharding-nyc-subteam1</label>
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                <created>Thu, 27 Jul 2023 20:25:51 +0000</created>
                <updated>Tue, 5 Sep 2023 13:59:20 +0000</updated>
                            <resolved>Tue, 5 Sep 2023 13:58:41 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5679658" author="renctan" created="Tue, 5 Sep 2023 13:58:41 +0000"  >&lt;p&gt;Original crash has been reverted and atClusterTime is being ignored because of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79766&quot; title=&quot;TransactionRouter ignores atClusterTime setting in the request&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79766&quot;&gt;SERVER-79766&lt;/a&gt;&lt;/p&gt;</comment>
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