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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-12552] Clarify concurrency FAQ: How does concurrency affect secondaries?</title>
                <link>https://jira.mongodb.org/browse/DOCS-12552</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;On &lt;a href=&quot;https://docs.mongodb.com/manual/faq/concurrency/#how-does-concurrency-affect-a-replica-set-primary&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/faq/concurrency/#how-does-concurrency-affect-a-replica-set-primary&lt;/a&gt;, this FAQ should be updated for &lt;a href=&quot;https://www.mongodb.com/blog/post/secondary-reads-mongodb-40&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;non-blocking secondary reads&lt;/a&gt; with WiredTiger in MongoDB 4.0:&lt;/p&gt;

&lt;blockquote&gt;
&lt;h2&gt;&lt;a name=&quot;Howdoesconcurrencyaffectsecondaries%3F&quot;&gt;&lt;/a&gt;How does concurrency affect secondaries?&lt;/h2&gt;

&lt;p&gt;In&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/glossary/#term-replication&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replication&lt;/a&gt;, MongoDB does not apply writes serially to&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/glossary/#term-secondary&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;secondaries&lt;/a&gt;. Secondaries collect oplog entries in batches and then apply those batches in parallel. Secondaries do not allow reads while applying the write operations, and apply write operations in the order that they appear in the oplog.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

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                <environment></environment>
        <key id="718447">DOCS-12552</key>
            <summary>Clarify concurrency FAQ: How does concurrency affect 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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="stephen.steneker@mongodb.com">Stennie Steneker</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Mar 2019 01:53:42 +0000</created>
                <updated>Mon, 30 Oct 2023 20:44:31 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940488" author="edu.bot" created="Mon, 31 Oct 2022 16:06:12 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
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