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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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            <title>[DOCS-2908] That we run READ_UNCOMMITTED should be documented</title>
                <link>https://jira.mongodb.org/browse/DOCS-2908</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;We should update this page:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/reference/write-concern/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/reference/write-concern/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;and this:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://docs.mongodb.org/manual/faq/fundamentals/#does-mongodb-support-acid-transactions&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/fundamentals/#does-mongodb-support-acid-transactions&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;to reflect the question posed here if the observed behavior is true:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;http://smalldatum.blogspot.com/2014/03/when-does-mongodb-make-transaction.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://smalldatum.blogspot.com/2014/03/when-does-mongodb-make-transaction.html&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;That is, if we consider the write fully committed only after it hits the journal, when j=true, then we should warn that another reader may see the write before it is fully committed. In the event of a failure and rollback, later readers may not see the write.&lt;/p&gt;

&lt;p&gt;This problem may also affect w=majority writes. In general, we want to guarantee the behavior that once a majority of members have seen the write, it is durable, even across the loss the primary. The problem is, if a majority of replica set nodes don&apos;t ack the write, and it&apos;s rolled back, someone on the primary may have already seen it. &lt;/p&gt;

&lt;p&gt;Essentially, we run READ_UNCOMMITTED. We should document this fact to avoid user confusion.&lt;/p&gt;


</description>
                <environment></environment>
        <key id="120236">DOCS-2908</key>
            <summary>That we run READ_UNCOMMITTED should be documented</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="erlichson">Andrew Erlichson</reporter>
                        <labels>
                    </labels>
                <created>Thu, 13 Mar 2014 17:07:37 +0000</created>
                <updated>Mon, 16 Mar 2015 23:57:20 +0000</updated>
                            <resolved>Fri, 4 Apr 2014 01:55:43 +0000</resolved>
                                                    <fixVersion>v1.3.3</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>1</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="535135" author="samk" created="Fri, 4 Apr 2014 01:55:36 +0000"  >&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/docs/commit/db0172f7786bca6eb33200dd66c0c2366209facf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/db0172f7786bca6eb33200dd66c0c2366209facf&lt;/a&gt;&lt;/p&gt;</comment>
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