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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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>[SERVER-40123] Transaction diagnostics should not report upconverted readConcern</title>
                <link>https://jira.mongodb.org/browse/SERVER-40123</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Transaction diagnostics report that all transactions execute with &lt;tt&gt;readConcern&lt;/tt&gt; level &lt;tt&gt;snapshot&lt;/tt&gt;, since originally we intended to upconvert the &lt;tt&gt;readConcern&lt;/tt&gt; to &lt;tt&gt;snapshot&lt;/tt&gt; for all single replica set transactions. However, this is false, since as we saw in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35821&quot; title=&quot;readConcern:snapshot transactions need a read timestamp &amp;lt;= WT&amp;#39;s all_committed point&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35821&quot;&gt;&lt;del&gt;SERVER-35821&lt;/del&gt;&lt;/a&gt;, transactions with &lt;tt&gt;readConcern&lt;/tt&gt; level &lt;tt&gt;majority&lt;/tt&gt; and &lt;tt&gt;local&lt;/tt&gt; do not execute with snapshot isolation. This difference will be more pronounced with multi-shard transactions, where we only select the same read timestamp across shards if the requested &lt;tt&gt;readConcern&lt;/tt&gt; level is &lt;tt&gt;snapshot&lt;/tt&gt;. Transaction diagnostics should now report the requested &lt;tt&gt;readConcern&lt;/tt&gt; level.&lt;/p&gt;

&lt;p&gt;There is a question of what to report when no &lt;tt&gt;readConcern&lt;/tt&gt; was specified, since we intend to change the default &lt;tt&gt;readConcern&lt;/tt&gt; from &lt;tt&gt;local&lt;/tt&gt; to (speculative) &lt;tt&gt;majority&lt;/tt&gt; in&#160;&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;. We could report no &lt;tt&gt;readConcern&lt;/tt&gt; for these transactions, since no &lt;tt&gt;readConcern&lt;/tt&gt; was requested.&lt;/p&gt;</description>
                <environment></environment>
        <key id="716744">SERVER-40123</key>
            <summary>Transaction diagnostics should not report upconverted readConcern</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="3">Duplicate</resolution>
                                        <assignee username="samy.lanka@mongodb.com">Samyukta Lanka</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Mar 2019 14:21:57 +0000</created>
                <updated>Thu, 22 Aug 2019 14:50:47 +0000</updated>
                            <resolved>Thu, 22 Aug 2019 14:50:47 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="2194847" author="tess.avitabile" created="Thu, 28 Mar 2019 16:59:42 +0000"  >&lt;p&gt;That was the original intention of reporting the read concern as snapshot, since we were upconverting all transactions to use snapshot read concern. However, now the behaviors of the different read concern levels are different, so we should be reporting the user&apos;s requested read concern.&lt;/p&gt;</comment>
                            <comment id="2194835" author="bruce.lucas@10gen.com" created="Thu, 28 Mar 2019 16:48:41 +0000"  >&lt;p&gt;Would it make sense to also report in a separate field the actual read concern used, if it differs from what was requested (including the case where none was specified)?&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="780880">SERVER-41359</issuekey>
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