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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-11690] Docs for SERVER-34880: Make readConcern:local wait for write concern on a read-only transaction</title>
                <link>https://jira.mongodb.org/browse/DOCS-11690</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h2&gt;

&lt;p&gt;This change makes it so in 4.0, local readConcern for transactions works in the exact same way as majority and snapshot read concerns; if we had language stating otherwise it&apos;s no longer correct.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%3A&quot;&gt;&lt;/a&gt;Scope of changes: &lt;/h2&gt;

&lt;ul&gt;
	&lt;li&gt;txn&lt;/li&gt;
	&lt;li&gt;readconcern-local&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct%3A&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%3A&quot;&gt;&lt;/a&gt;MVP: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%3A&quot;&gt;&lt;/a&gt;Resources: &lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h2&gt;

&lt;p&gt;A transaction started with readConcern:local that doesn&apos;t do any writes does not need to wait for the data it read to be committed when the transaction commits.&#160;&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34038&quot; title=&quot;Make sure that commitTransaction waits for writeConcern after a read-only transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34038&quot;&gt;&lt;del&gt;SERVER-34038&lt;/del&gt;&lt;/a&gt; implemented the behavior that causes read-only txns with RC &apos;majority&apos; and &apos;snapshot&apos; to wait for the data read to be committed at commit time, and intentionally excluded RC &apos;local&apos; from that waiting.&#160; However, since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34837&quot; title=&quot;Make the default readConcern level for transactions be speculative majority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34837&quot;&gt;SERVER-34837&lt;/a&gt; isn&apos;t going to get done for 4.0, we should temporarily make RC &apos;local&apos; behave like RC &apos;majority&apos; and &apos;snapshot&apos; in this case, so that the fact that the readConcern default is incorrect will not be observable.&lt;/p&gt;</description>
                <environment></environment>
        <key id="542836">DOCS-11690</key>
            <summary>Docs for SERVER-34880: Make readConcern:local wait for write concern on a read-only transaction</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="13203">Gone away</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Fri, 11 May 2018 21:36:34 +0000</created>
                <updated>Fri, 27 Oct 2023 20:16:20 +0000</updated>
                            <resolved>Mon, 18 Jun 2018 19:01:32 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1923947" author="tess.avitabile" created="Mon, 18 Jun 2018 18:58:32 +0000"  >&lt;p&gt;No, I do not think we should document this behavior. This change was made because we would like the default readConcern for an operation that can write to be &lt;tt&gt;majority&lt;/tt&gt;, but in 4.0, the default readConcern for a transaction is &lt;tt&gt;local&lt;/tt&gt;. We addressed this by making readConcern &lt;tt&gt;local&lt;/tt&gt; behave identically to &lt;tt&gt;majority&lt;/tt&gt; for transactions. However, if/when we make the default readConcern for a transaction be &lt;tt&gt;majority&lt;/tt&gt;, then if a user explicitly specifies readConcern &lt;tt&gt;local&lt;/tt&gt;, we would be free to skip the wait upon commit of a read-only transaction.&lt;/p&gt;</comment>
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