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    <title>MongoDB Jira</title>
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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>[DRIVERS-1729] Investigate changes in PM-1970: Change the Default Read Concern to Always Be Local</title>
                <link>https://jira.mongodb.org/browse/DRIVERS-1729</link>
                <project id="10980" key="DRIVERS">Drivers</project>
                    <description>
    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    The current read concern default for sharded secondary reads (that are not associated with a causally consistent session) is &apos;available&apos; and in all other cases is &apos;local&apos;. Starting in 5.0, we plan to change the default read concern to always be &apos;local&apos;.&lt;/p&gt;
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&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;Review the current read and write concern settings and propose changes to provide more intuitive and safe defaults.&lt;/p&gt;


&lt;h4&gt;&lt;a name=&quot;Motivation&quot;&gt;&lt;/a&gt;Motivation&lt;/h4&gt;

&lt;p&gt;There are two primary motivations for adjusting our defaults. First, although MongoDB allows users to choose the right tradeoff between performance and consistency, the nuances of the system are complex and are often misused, or surprising to users. We should provide more intuitive and stronger consistency default settings out of the box. Second, MongoDB has battled with the user perception that it is not reliable or intentionally chooses unsafe defaults to appear faster in benchmarks. By changing the defaults, we eliminate that argument.&lt;/p&gt;


&lt;h4&gt;&lt;a name=&quot;CastofCharacters&quot;&gt;&lt;/a&gt;Cast of Characters&lt;/h4&gt;
&lt;ul&gt;
	&lt;li&gt;Product Owner:&lt;/li&gt;
	&lt;li&gt;Project Lead:&lt;/li&gt;
	&lt;li&gt;Program Manager:&lt;/li&gt;
	&lt;li&gt;Drivers Contact:&lt;/li&gt;
&lt;/ul&gt;



&lt;h4&gt;&lt;a name=&quot;Documentation&quot;&gt;&lt;/a&gt;Documentation&lt;/h4&gt;
&lt;p&gt;&lt;a href=&quot;http://tinyurl.com/y8msl57l&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Scope Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/ybytcwut&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Technical Design Document&lt;/a&gt;&lt;br/&gt;
&lt;a href=&quot;http://tinyurl.com/yd9djtsy&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Product Description&lt;/a&gt;&lt;/p&gt;
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                <environment></environment>
        <key id="1702287">DRIVERS-1729</key>
            <summary>Investigate changes in PM-1970: Change the Default Read Concern to Always Be Local</summary>
                <type id="11" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14707&amp;avatarType=issuetype">Epic</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="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 5 May 2021 16:09:12 +0000</created>
                <updated>Fri, 27 May 2022 01:25:24 +0000</updated>
                            <resolved>Mon, 10 May 2021 16:48:51 +0000</resolved>
                                                                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3764243" author="esha.bhargava" created="Mon, 10 May 2021 16:48:51 +0000"  >&lt;p&gt;No driver changes needed.&lt;/p&gt;</comment>
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