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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-11944] Docs for SERVER-36240: Make transactions on mongos use snapshot level readConcern if no level was provided</title>
                <link>https://jira.mongodb.org/browse/DOCS-11944</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h2&gt;

&lt;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;I&apos;m not sure we need to document this, since we&apos;ll definitely revisit readConcern for sharded transactions later this release as we add support for more readConcern levels, but putting &quot;Needed&quot; just in case. This ticket explicitly disallowed starting a sharded transaction with any readConcern level other than &quot;snapshot&quot; (so local and majority are rejected, unlike on mongod in 4.0). If a user provides no readConcern level when starting a transaction though, mongos will use snapshot as the default.&lt;/p&gt;

&lt;h3&gt;&lt;a name=&quot;EngineeringTicketDescription%3A&quot;&gt;&lt;/a&gt;Engineering Ticket Description:&lt;/h3&gt;

&lt;p&gt;If the first statement in a transaction does not specify snapshot readConcern, mongod will implicitly upconvert it to snapshot. Mongos currently does not have this behavior, and because many &lt;tt&gt;core/txns&lt;/tt&gt; tests rely on this, either mongos will need to upconvert readConcerns to snapshot as well (until we support transactions with other readConcern levels) or the tests need to be updated to explicitly choose snapshot readConcern.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;----------------------------&lt;/p&gt;
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                <environment></environment>
        <key id="584996">DOCS-11944</key>
            <summary>Docs for SERVER-36240: Make transactions on mongos use snapshot level readConcern if no level was provided</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>
                            <label>ShardedTxn:RouterSupport</label>
                            <label>docs-txns</label>
                    </labels>
                <created>Tue, 7 Aug 2018 16:30:22 +0000</created>
                <updated>Fri, 27 Oct 2023 20:16:18 +0000</updated>
                            <resolved>Thu, 21 Feb 2019 20:48:28 +0000</resolved>
                                                    <fixVersion>4.1.2</fixVersion>
                                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2131513" author="kay.kim@10gen.com" created="Wed, 30 Jan 2019 01:07:20 +0000"  >&lt;p&gt;May be a Gone Away.&#160; See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39274&quot; title=&quot;Mongos should not upconvert transaction read concern level to snapshot if none is provided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39274&quot;&gt;&lt;del&gt;SERVER-39274&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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