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    <description>This file is an XML representation of an issue</description>
    <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-12551] Clarify concurrency FAQ: How does concurrency affect a replica set primary?</title>
                <link>https://jira.mongodb.org/browse/DOCS-12551</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 response appears to be MMAP-specific:&lt;/p&gt;
&lt;blockquote&gt;
&lt;h2&gt;&lt;a name=&quot;Howdoesconcurrencyaffectareplicasetprimary%3F&quot;&gt;&lt;/a&gt;How does concurrency affect a replica set primary?&lt;/h2&gt;

&lt;p&gt;With replica sets, when MongoDB writes to a collection on the&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/glossary/#term-primary&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;primary&lt;/a&gt;, MongoDB also writes to the primary&apos;s&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/glossary/#term-oplog&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;oplog&lt;/a&gt;, which is a special collection in the&#160;&lt;tt&gt;local&lt;/tt&gt;&#160;database. Therefore, MongoDB must lock both the collection&apos;s database and the&#160;&lt;tt&gt;local&lt;/tt&gt;&#160;database. The&#160;&lt;a href=&quot;https://docs.mongodb.com/manual/reference/program/mongod/#bin.mongod&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;mongod&lt;/tt&gt;&lt;/a&gt;&#160;must lock both databases at the same time to keep the database consistent and ensure that write operations, even with replication, are &quot;all-or-nothing&quot; operations.&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;ul&gt;
	&lt;li&gt;Discuss w/ replication + storage team what the WiredTiger behavior is (for 4.2)&lt;/li&gt;
	&lt;li&gt;Discuss w/ replication + storage team what the MMAPv1 behavior is (for 4.0, 3.6)&lt;/li&gt;
	&lt;li&gt;Update documentation as required.&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;%C2%A0&quot;&gt;&lt;/a&gt;&#160;&lt;/h2&gt;</description>
                <environment></environment>
        <key id="718444">DOCS-12551</key>
            <summary>Clarify concurrency FAQ: How does concurrency affect a replica set primary?</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>
                            <label>docs-onboarding-candidate</label>
                    </labels>
                <created>Mon, 18 Mar 2019 01:53:07 +0000</created>
                <updated>Mon, 30 Oct 2023 20:44:34 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940489" 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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