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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-64131] Turn on WT write_timestamp_usage assertions for release builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-64131</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/WT-8876&quot; title=&quot;Make timestamp usage checking at commit the default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8876&quot;&gt;&lt;del&gt;WT-8876&lt;/del&gt;&lt;/a&gt; will introduce a default write_timestamp_usage of &lt;tt&gt;ordered&lt;/tt&gt;. As we only set &lt;tt&gt;write_timestamp_usage&lt;/tt&gt; on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d07e0bd356d517729f0e3ccae992a5c41e9d5f74/src/mongo/db/storage/wiredtiger/wiredtiger_record_store.cpp#L79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;test runs&lt;/a&gt;, we should prepare for the change by setting the usage in all circumstances.&lt;/p&gt;

&lt;p&gt;Additionally we may want to set the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d07e0bd356d517729f0e3ccae992a5c41e9d5f74/src/mongo/db/storage/wiredtiger/wiredtiger_size_storer.cpp#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sizeStorer to a usage of `none`&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Some background: with &lt;a href=&quot;https://jira.mongodb.org/browse/WT-8876&quot; title=&quot;Make timestamp usage checking at commit the default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-8876&quot;&gt;&lt;del&gt;WT-8876&lt;/del&gt;&lt;/a&gt;, WT&apos;s behavior on a MDB release build w.r.t: write_timestamp_usage will be to:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;default to `ordered` if one is not specified. This is an in-memory setting and not persisted.&lt;/li&gt;
	&lt;li&gt;If an violation is found: log an error&lt;/li&gt;
	&lt;li&gt;succeed the transaction&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This keeps the behavior as we have it today. Assuming our existing test coverage is complete (where these assertions fail tests), we expect no log lines to emitted.&lt;/p&gt;

&lt;p&gt;After confirming there are no new log lines, WT can change behavior to fail commits if the write_timestamp_usage assertion isn&apos;t satisfied.&lt;/p&gt;

&lt;p&gt;This ticket should also take care in setting the &lt;tt&gt;write_timestamp_usage&lt;/tt&gt; back to none (or disabling its assertion/verbose settings) when shutting down with a downgraded FCV. Generally speaking, everytime we strengthen an assertion in a new release there must be accompanying code to relax it on downgrade.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1993441">SERVER-64131</key>
            <summary>Turn on WT write_timestamp_usage assertions for release builds</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Mar 2022 21:51:48 +0000</created>
                <updated>Tue, 9 Aug 2022 19:18:25 +0000</updated>
                            <resolved>Tue, 9 Aug 2022 19:18:25 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4738762" author="daniel.gottlieb@10gen.com" created="Tue, 9 Aug 2022 19:18:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-65971&quot; title=&quot;Avoid/Suppress mixed_mode write on config.transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-65971&quot;&gt;&lt;del&gt;SERVER-65971&lt;/del&gt;&lt;/a&gt; instead opts to turn on timestamp assertions by default. Individual WT transactions can opt out of being checked.&lt;/p&gt;</comment>
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