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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-83073] Clarify what lastApplied, lastDurable, etc. mean on primary and secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-83073</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The definitions in the architecture guide do not go into detail regarding no-holes, etc. for these definitions. For example:&lt;br/&gt;
&lt;em&gt;&lt;b&gt;lastApplied&lt;/b&gt;: In-memory record of the latest applied oplog entry optime. On primaries, it may lag behind the optime of the newest oplog entry that is visible in the storage engine because it is updated after a storage transaction commits. On secondaries, lastApplied is only updated at the completion of an oplog batch&lt;/em&gt;&lt;/p&gt;

&lt;p&gt;The above definition doesn&apos;t make it clear what happens on the primary when there is an oplog hole. Is the lastAppliedOpTime allowed to advance past the oplog hole? (Yes)&lt;/p&gt;

&lt;p&gt;It is also worth spelling out the relationship between lastApplied and lastDurable, for example, lastDurable &amp;lt;= lastApplied, and why that&apos;s the case.&lt;/p&gt;

&lt;p&gt;I think it&apos;s OK to be more verbose here and would even recommend having examples.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2495771">SERVER-83073</key>
            <summary>Clarify what lastApplied, lastDurable, etc. mean on primary and secondaries</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-repl">Backlog - Replication Team</assignee>
                                    <reporter username="vishnu.kaushik@mongodb.com">Vishnu Kaushik</reporter>
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                <created>Thu, 9 Nov 2023 18:53:17 +0000</created>
                <updated>Fri, 10 Nov 2023 01:00:54 +0000</updated>
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