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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-62510] ephemeralForTest oplog visibility bug</title>
                <link>https://jira.mongodb.org/browse/SERVER-62510</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;EFT does not correctly implement oplog visibility. It checks the &quot;all committed&quot; value after forking and obtaining a snapshot. This means that the highest-visible point in the oplog can actually reflect uncommmited operations in the oplog cursor&apos;s snapshot.&lt;/p&gt;

&lt;p&gt;For example. Say operations with timestamps T1 and T3 are committed, but T2 is not. The &quot;all committed&quot; (aka &quot;highest visible&quot;) operation should be T1.&lt;/p&gt;

&lt;p&gt;Consider the sequence:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;An oplog reader obtains a snapshot. T1 and T3 are visible, T2 is not.&lt;/li&gt;
	&lt;li&gt;T2 commits in parallel&lt;/li&gt;
	&lt;li&gt;The oplog reader opens a cursor sees the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/204d6eed96ed5151b1d11b22d128d923b452833f/src/mongo/db/storage/ephemeral_for_test/ephemeral_for_test_record_store.cpp#L352&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;highest visible&lt;/a&gt; record as T3. The operation returns T1 and T3, but skips T2.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38499&quot; title=&quot;Preparing transaction fails and triggers invariant if chosen timestamp is not greater than WiredTiger&amp;#39;s latest active read timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38499&quot;&gt;&lt;del&gt;SERVER-38499&lt;/del&gt;&lt;/a&gt; for details on how this was implemented in MongoDB.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1961682">SERVER-62510</key>
            <summary>ephemeralForTest oplog visibility bug</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="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>EFT</label>
                    </labels>
                <created>Tue, 11 Jan 2022 12:30:27 +0000</created>
                <updated>Fri, 27 Oct 2023 20:45:45 +0000</updated>
                            <resolved>Wed, 27 Apr 2022 13:50:26 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4285337" author="louis.williams" created="Tue, 11 Jan 2022 12:31:37 +0000"  >&lt;p&gt;We should probably just disable this test on EFT&lt;/p&gt;</comment>
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