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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>[DOCS-5809] Explain how delayed secondaries apply the oplogs</title>
                <link>https://jira.mongodb.org/browse/DOCS-5809</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Could not find a place in the doc that describes how the delayed secondaries are applying oplogs.&lt;br/&gt;
The typical question is regarding if:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;they are read with a delay, then applied&lt;/li&gt;
	&lt;li&gt;read immediately from the primary, but applied with a delay&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;The answer is 1.&lt;/p&gt;

&lt;p&gt;This page may be a good place to add the info:&lt;br/&gt;
  &lt;a href=&quot;http://docs.mongodb.org/manual/core/replica-set-delayed-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/core/replica-set-delayed-member/&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="216018">DOCS-5809</key>
            <summary>Explain how delayed secondaries apply the oplogs</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="9">Done</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="daniel.coupal@mongodb.com">Daniel Coupal</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Jul 2015 23:23:26 +0000</created>
                <updated>Mon, 30 Oct 2023 22:28:38 +0000</updated>
                            <resolved>Thu, 24 May 2018 05:54:46 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1900363" author="stennie" created="Thu, 24 May 2018 05:54:46 +0000"  >&lt;p&gt;The current &lt;a href=&quot;https://docs.mongodb.com/manual/core/replica-set-delayed-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Delayed Replica Set Members&lt;/a&gt; page describe this behaviour:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Delayed members copy and apply operations from the source oplog on a delay. When choosing the amount of delay, consider that the amount of delay:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;must be equal to or greater than your expected maintenance window durations.&lt;/li&gt;
	&lt;li&gt;must be smaller than the capacity of the oplog. For more information on oplog size, see Oplog Size.&lt;/li&gt;
&lt;/ul&gt;
&lt;/blockquote&gt;

&lt;p&gt;The &quot;copy and apply&quot; step requires the delayed secondary to have an oplog point in common with the source oplog.&lt;/p&gt;</comment>
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