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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-53703] [4.2] Opening a transaction at the all durable timestamp can go backwards</title>
                <link>https://jira.mongodb.org/browse/SERVER-53703</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41766&quot; title=&quot;Secondary may encounter prepare conflict when applying write that sets the multikey flag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41766&quot;&gt;&lt;del&gt;SERVER-41766&lt;/del&gt;&lt;/a&gt; introduced ghost timestamps on a primary for multi-statement transactions doing a multikey write. This causes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/87d0144984752767599297de915c45d828316896/src/mongo/db/storage/wiredtiger/wiredtiger_oplog_manager.cpp#L256&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WT&apos;s perspective of the all durable&lt;/a&gt;&#160;timestamp to go backwards.&lt;/p&gt;

&lt;p&gt;To compensate, the method to get the all durable that the storage engine exposes &lt;a href=&quot;https://github.com/mongodb/mongo/blob/87d0144984752767599297de915c45d828316896/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L2041-L2046&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ensures the value does not go backwards&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;However, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/87d0144984752767599297de915c45d828316896/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L589&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;4.2 version of reading at the all durable timestamp&lt;/a&gt; uses the API that can go backwards. This can result in causal reads not seeing their own writes when they are concurrent with other writers flipping multikey inside a multi statement transaction. Reading at the no overlap, however &lt;a href=&quot;https://github.com/mongodb/mongo/blob/87d0144984752767599297de915c45d828316896/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L650&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;does use from the safe API&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;4.4 (and master) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/917e3e22cf21d71b1fb2a6649577c92a1beda78f/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L606&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;use the WTKVEngine&lt;/a&gt; call which protects them from this bug.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1586557">SERVER-53703</key>
            <summary>[4.2] Opening a transaction at the all durable timestamp can go backwards</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="13201">Fixed</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Jan 2021 02:13:30 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:56 +0000</updated>
                            <resolved>Tue, 12 Jan 2021 15:54:45 +0000</resolved>
                                                    <fixVersion>4.2.12</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3560016" author="xgen-internal-githook" created="Tue, 12 Jan 2021 15:33:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53703&quot; title=&quot;[4.2] Opening a transaction at the all durable timestamp can go backwards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53703&quot;&gt;&lt;del&gt;SERVER-53703&lt;/del&gt;&lt;/a&gt;: Use WTKVEngine to compute the all durable timestamp.&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2b91684f767aa151585e7cc79bc35312acc12d7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2b91684f767aa151585e7cc79bc35312acc12d7&lt;/a&gt;&lt;/p&gt;</comment>
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