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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-72289] Add a section about how Timestamping works to the catalog/README architecture guide</title>
                <link>https://jira.mongodb.org/browse/SERVER-72289</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We do not appear to have a section dedicated to timestamps in the architecture guide. But we sure do get a lot of questions about it, both from members within our own team and from external team members.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2216364">SERVER-72289</key>
            <summary>Add a section about how Timestamping works to the catalog/README architecture guide</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Tue, 20 Dec 2022 20:56:55 +0000</created>
                <updated>Tue, 17 Jan 2023 16:48:41 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5087332" author="dianna.hohensee" created="Tue, 3 Jan 2023 16:49:27 +0000"  >&lt;p&gt;Things like&lt;/p&gt;

&lt;p&gt;How we set the storage engine oldestTimestamp &amp;amp; stableTimestamp values, and the read window of durable history that they define.&lt;/p&gt;

&lt;p&gt;Other means of pinning the oldestTimestamp, why we do it / what feature is supported thereby&lt;/p&gt;

&lt;p&gt;How are timestamps allotted to new incoming writes &#8211; from handing out a timestamp, to commit.&lt;/p&gt;

&lt;p&gt;What does timestamp 0 do, when used in writes and reads &#8211; immediate visibility to readers (I forget whether it can suddenly show up in already opened snapshots) and checkpoint behavior.&lt;/p&gt;

&lt;p&gt;Bit tangential, but whether or not we write oplog entries for some writes, how that is controlled.&lt;/p&gt;

&lt;p&gt;Sketch of protections we now have in place against untimestamped writes&lt;/p&gt;

&lt;p&gt;There does appear to be a replication timestamps section to the repl README &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/repl/README.md#replication-timestamp-glossary&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, but I think there are more interesting details about timestamps from the storage/storage execution perspective. The repl README, actually, discusses &lt;tt&gt;all_durable&lt;/tt&gt;, but it doesn&apos;t make mention of the fact that &lt;tt&gt;all_durable&lt;/tt&gt; is in-memory and repl&apos;s lastDurable something or other timestamp represents the crash-durable timestamp.&lt;/p&gt;</comment>
                            <comment id="5087222" author="gregory.noma" created="Tue, 3 Jan 2023 16:24:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=dianna.hohensee%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;dianna.hohensee@mongodb.com&quot;&gt;dianna.hohensee@mongodb.com&lt;/a&gt; there should be a section in the repl arch guide about timestamps, are there any additional things about timestamps that you&apos;re interested in? &lt;/p&gt;</comment>
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