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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>[DOCS-12588] Document implication of sharded txn on  clusterTime in change stream event </title>
                <link>https://jira.mongodb.org/browse/DOCS-12588</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;Currently the documentation for clusterTime in a change stream event says:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;For events that happened as part of a multi-document transaction, the associated change stream notifications will have the same clusterTime value, namely the time when the transaction was committed&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;While this is still factually correct in MongoDB 4.2, it implies something that may not be true: that two events with the same clusterTime ALWAYS are part of the same transaction.  As &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt; pointed out to me, two transactions that are not causally consistent with each other, and that execute on two different shards, could end up with the same clusterTime for their associated change stream events.&lt;/p&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;ul&gt;
	&lt;li&gt;Update description of &lt;tt&gt;clusterTime&lt;/tt&gt; on &lt;a href=&quot;https://docs.mongodb.com/manual/reference/change-events/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/reference/change-events/&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment>&lt;a href=&quot;https://docs.mongodb.com/manual/reference/change-events/&quot;&gt;https://docs.mongodb.com/manual/reference/change-events/&lt;/a&gt;</environment>
        <key id="727487">DOCS-12588</key>
            <summary>Document implication of sharded txn on  clusterTime in change stream event </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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Apr 2019 21:50:03 +0000</created>
                <updated>Mon, 30 Oct 2023 20:43:54 +0000</updated>
                            <resolved>Tue, 28 May 2019 17:21:27 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2262175" author="xgen-internal-githook" created="Tue, 28 May 2019 17:19:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12540&quot; title=&quot;Docs for SERVER-39302: Change streams should always use the simple collation when no explicit collation is provided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12540&quot;&gt;&lt;del&gt;DOCS-12540&lt;/del&gt;&lt;/a&gt;,&lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-12588&quot; title=&quot;Document implication of sharded txn on  clusterTime in change stream event &quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-12588&quot;&gt;&lt;del&gt;DOCS-12588&lt;/del&gt;&lt;/a&gt;: db.coll.watch() default collation, changestream events clusterTime and sharded cluster txns&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/6bf989fb89663fa1e27ccfd9c7e6b7abd59b95a9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/6bf989fb89663fa1e27ccfd9c7e6b7abd59b95a9&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="715062">JAVA-3225</issuekey>
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