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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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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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<item>
            <title>[SERVER-48557] Omit cursor.atClusterTime field from read replies in transactions</title>
                <link>https://jira.mongodb.org/browse/SERVER-48557</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47690&quot; title=&quot;mongos changes for snapshot reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47690&quot;&gt;&lt;del&gt;SERVER-47690&lt;/del&gt;&lt;/a&gt;, we added an &quot;atClusterTime&quot; field to cursor replies for non-transaction snapshot reads:&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    atClusterTime: Timestamp(...)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;
&lt;p&gt;As a consequence of the implementation, cursor replies to snapshot reads that &lt;b&gt;are&lt;/b&gt; in transactions also gained &quot;atClusterTime&quot;, and we decided that was fine. Let&apos;s change our minds and omit the field for replies to commands in transactions. It&apos;s not useful.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1369968">SERVER-48557</key>
            <summary>Omit cursor.atClusterTime field from read replies in transactions</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="13201">Fixed</resolution>
                                        <assignee username="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Jun 2020 02:19:10 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:30 +0000</updated>
                            <resolved>Mon, 15 Jun 2020 21:21:33 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3208957" author="xgen-internal-githook" created="Mon, 15 Jun 2020 21:18:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48557&quot; title=&quot;Omit cursor.atClusterTime field from read replies in transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48557&quot;&gt;&lt;del&gt;SERVER-48557&lt;/del&gt;&lt;/a&gt;: Omit cursor.atClusterTime field from read replies in transactions&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1261db4a593fe06c5139fc0c9877c406d76b5bb4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1261db4a593fe06c5139fc0c9877c406d76b5bb4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3201340" author="lingzhi.deng" created="Tue, 9 Jun 2020 22:13:59 +0000"  >&lt;p&gt;Currently, we append atClusterTime in responses when the readConcern has atClusterTime or the server has picked an atClusterTime for a snapshot read (only when it is not in a transaction). So normally, snapshot reads in a transaction won&apos;t have atClusterTime in the responses because the readConcern doesn&apos;t have an atClusterTime and snapshot in transactions are speculative. But if a transaction is done via mongos, it would then have an anClusterTime (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/be253e1614bb05dc9a9ace507b263fb4885dcdee/src/mongo/s/transaction_router.cpp#L71-L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;appendAtClusterTimeToReadConcern&lt;/a&gt;). This means that snapshot reads in transactions via mongos would have an atClusterTime in the responses. So in order to keep the same behaviors for transactions (for replica sets and sharded clusters), we should not return atClusterTime in responses for transactions regardless of whether an atClusterTime is specified.&lt;/p&gt;</comment>
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