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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-63308] Accommodate WT-8601</title>
                <link>https://jira.mongodb.org/browse/SERVER-63308</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-8601&quot; title=&quot;Timestamps do not work with logged tables.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8601&quot;&gt;&lt;del&gt;WT-8601&lt;/del&gt;&lt;/a&gt; fixes a WT bug where timestamped writes to logged tables (potentially) do not provide repeatable reads across a restart. This is because the WT log does not preserve timestamp information, thus writes recovered from the log can be read by a reader with any &lt;tt&gt;read_timestamp&lt;/tt&gt; input.&lt;/p&gt;

&lt;p&gt;MDB did rely on using read_timestamp for the oplog, but not in a way where the WT bug could manifest (anything the journal recovers is either rewritten by MDB or no longer a hole where the read_timestamp is meaningful).&lt;/p&gt;

&lt;p&gt;WT&apos;s change for 8601 isn&apos;t to fix the bug per-se, but rather to drop timestamp information completely on writes to logged tables. Thus the behavior is consistent and an application can never successfully rely on it existing.&lt;/p&gt;

&lt;p&gt;This ticket is to transform MDBs usage of &lt;tt&gt;read_timestamp&lt;/tt&gt; on the oplog into the server itself.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1977615">SERVER-63308</key>
            <summary>Accommodate WT-8601</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="13201">Fixed</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Fri, 4 Feb 2022 16:55:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:43:03 +0000</updated>
                            <resolved>Tue, 8 Feb 2022 16:45:37 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4342606" author="xgen-internal-githook" created="Tue, 8 Feb 2022 16:34:32 +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-63308&quot; title=&quot;Accommodate WT-8601&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63308&quot;&gt;&lt;del&gt;SERVER-63308&lt;/del&gt;&lt;/a&gt;: Accomodate &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8601&quot; title=&quot;Timestamps do not work with logged tables.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8601&quot;&gt;&lt;del&gt;WT-8601&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Move read timestamp visibility against the oplog into MongoDB. WiredTiger&lt;br/&gt;
historically loses timestamp information across restarts on logged tables. MDB&lt;br/&gt;
does rely on read_timestamps for visibility against the oplog in some&lt;br/&gt;
circumstances. While case analysis supports that the WT bug does not manifest&lt;br/&gt;
in MDB, &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8601&quot; title=&quot;Timestamps do not work with logged tables.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8601&quot;&gt;&lt;del&gt;WT-8601&lt;/del&gt;&lt;/a&gt; fully removes timestamps from `WT_UPDATE`s in logged tables.&lt;/p&gt;

&lt;p&gt;In MDB, the keys for oplog documents are the object&apos;s timestamp. MDB will&lt;br/&gt;
instead use that value to filter an oplog entry&apos;s visibilty.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/df441f20aab3ec13d30ab157d5761d419edc2051&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/df441f20aab3ec13d30ab157d5761d419edc2051&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1876924">SERVER-60037</issuekey>
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