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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33866] Decouple oplog fetching from oplog application</title>
                <link>https://jira.mongodb.org/browse/SERVER-33866</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we don&apos;t fetch a new batch of oplog entries until we have finished applying the previous batch.  Instead, we should fetch oplog entries as fast as we can get them from our sync source and write them down, and in parallel we should be applying oplog entries as fast as we can.  This would be especially useful in conjunction with &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32513&quot; title=&quot;Initial sync unnecessarily throws away oplog entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32513&quot;&gt;&lt;del&gt;SERVER-32513&lt;/del&gt;&lt;/a&gt;, so that when coming out of initial sync you never stop syncing from your sync source, which would greatly limit the degree to which initial sync was dependent on the size of its sync source&apos;s oplog.&lt;/p&gt;</description>
                <environment></environment>
        <key id="510849">SERVER-33866</key>
            <summary>Decouple oplog fetching from oplog application</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Mar 2018 23:18:18 +0000</created>
                <updated>Tue, 22 Aug 2023 14:21:00 +0000</updated>
                            <resolved>Tue, 22 Aug 2023 14:21:00 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1833282" author="milkie" created="Wed, 14 Mar 2018 12:10:10 +0000"  >&lt;p&gt;Oplog fetching is already decoupled from oplog application.  I think what you mean instead is that the act of writing the oplog is currently coupled to the applier applying batches of oplog entries.  This behavior used to be necessary when the &quot;end of the oplog&quot; was meaningful, but we have since changed the logic such that the last batch boundary is durably and separately tracked.  Thus, we can certainly write oplog entries into the oplog without regard to the progress of the applier.&lt;/p&gt;</comment>
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