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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-6485] Comment on: &quot;manual/core/write-concern.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-6485</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Is this article correct if you&apos;re using WiredTiger?&lt;/p&gt;

&lt;p&gt;From what I&apos;ve read about WiredTiger, there isn&apos;t a concept of a journal which is flushed to disk like a memory mapped file would be.&lt;/p&gt;

&lt;p&gt;See - &lt;a href=&quot;http://www.slideshare.net/JonRangel/let-the-tiger-roar-mongodb-30-wiredtiger&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.slideshare.net/JonRangel/let-the-tiger-roar-mongodb-30-wiredtiger&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;On slide 17 - It states &quot;consistency without journalling&quot;:&lt;br/&gt;
On slide 20 - It states &quot;no journal commit interval: writes are written to the journal as they come in&quot;&lt;/p&gt;

&lt;p&gt;So, in this case, is Acknowledged write concern the same as Journaled under WiredTiger?&lt;/p&gt;

&lt;p&gt;Also, in MMAPv1, when writes are Acknowledged, they sit in RAM before flushing to the journal, but in WiredTiger, if writes really are journaled &quot;as they come in&quot; according to the presentation, then the information on &lt;a href=&quot;https://docs.mongodb.org/manual/faq/concurrency/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.org/manual/faq/concurrency/&lt;/a&gt; could be wrong.&lt;/p&gt;

&lt;p&gt;In particular, the section of &quot;Can reads see changes that have not been committed to disk?&quot; states that dirty reads (read uncommitted) are possible, but the presentation here seems to suggest that it&apos;s not possible under WiredTiger.&lt;/p&gt;

&lt;p&gt;See slide 13 - where it says &quot;In-memory consistency&quot; and slide 17 where it states that &quot;Readers see the version that was committed before the operation started&quot;.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://www.slideshare.net/wiredtiger/mongo-db-worldwiredtiger?related=3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.slideshare.net/wiredtiger/mongo-db-worldwiredtiger?related=3&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Some clarity on the behaviour here is essential for me.&lt;/p&gt;</description>
                <environment>*Location*: &lt;a href=&quot;https://docs.mongodb.org/manual/core/write-concern/&quot;&gt;https://docs.mongodb.org/manual/core/write-concern/&lt;/a&gt;&lt;br/&gt;
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        <key id="236868">DOCS-6485</key>
            <summary>Comment on: &quot;manual/core/write-concern.txt&quot;</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="-1">Unassigned</assignee>
                                    <reporter username="xgen-internal-docs">Docs Collector User</reporter>
                        <labels>
                            <label>bite-sized</label>
                            <label>docs-triage</label>
                    </labels>
                <created>Thu, 29 Oct 2015 17:52:06 +0000</created>
                <updated>Mon, 30 Oct 2023 21:40:04 +0000</updated>
                            <resolved>Tue, 1 Nov 2022 11:01:17 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4943582" author="edu.bot" created="Tue, 1 Nov 2022 11:01:14 +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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