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    <title>MongoDB Jira</title>
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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>[DOCS-1030] Need to complete the thought re. failed secondaries</title>
                <link>https://jira.mongodb.org/browse/DOCS-1030</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/administration/sharding-architectures/#sharding-high-availability&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/administration/sharding-architectures/#sharding-high-availability&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Here&apos;s the sentence in question:&lt;/p&gt;

&lt;p&gt;&quot;If the unavailable mongod is a secondary, and it connects within its recovery window.&quot;&lt;/p&gt;

&lt;p&gt;My understanding is as follows:&lt;/p&gt;

&lt;p&gt;Within a given shard, if the unavailable mongod is a secondary then reads/writes directed to that shard&#8217;s primary will continue without interruption. When that secondary&#8217;s operations resume, it must reconnect within it&#8217;s recovery window in order to catch up on any writes it may have missed. The recovery window is determined by the size of the oplog. Many users configure an oplog sufficient to maintain a recovery window of multiple days. &lt;/p&gt;

&lt;p&gt;Also, there&apos;s mention of &quot;recovery window&quot; that links to oplog sizing. It isn&apos;t obvious that the two are related, and the term &quot;recovery window&quot; doesn&apos;t appear on the oplog sizing page.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="62951">DOCS-1030</key>
            <summary>Need to complete the thought re. failed 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="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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="kelly.stirman">Kelly Stirman</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Jan 2013 23:52:26 +0000</created>
                <updated>Mon, 28 Jan 2013 22:56:54 +0000</updated>
                            <resolved>Wed, 23 Jan 2013 01:00:10 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="247109" author="auto" created="Wed, 23 Jan 2013 00:52:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-01-23T00:14:06Z&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1030&quot; title=&quot;Need to complete the thought re. failed secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1030&quot;&gt;&lt;del&gt;DOCS-1030&lt;/del&gt;&lt;/a&gt;: replica set failover procedure&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e707288c6f703a6dce927e2c0a7ea2b3962195e4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e707288c6f703a6dce927e2c0a7ea2b3962195e4&lt;/a&gt;&lt;/p&gt;</comment>
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