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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>[DOCS-12540] Docs for SERVER-39302: Change streams should always use the simple collation when no explicit collation is provided</title>
                <link>https://jira.mongodb.org/browse/DOCS-12540</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;blockquote&gt;
&lt;h3&gt;&lt;a name=&quot;Description%3A&quot;&gt;&lt;/a&gt;Description: &lt;/h3&gt;

&lt;p&gt;Previously, single-collection change streams inherited the default collation of the collection on which they were opened. This makes little sense, given that we are not actually querying documents from that collection; a so-called single-collection change stream is just a filter on the oplog for that namespace. This behaviour unintuitively restricts the client&apos;s ability to resume the stream, and is inconsistent with the semantics of whole-db and whole-cluster streams - both of which always use the simple collation unless explicitly provided with an alternative.&lt;/p&gt;

&lt;p&gt;To ensure stability with respect to the change stream&apos;s collation, and to guarantee that we can resume the stream in all circumstances, this ticket changes the behaviour of single-namespace streams to be consistent with whole-db and whole-cluster streams. All change streams will now use the simple collation unless a different collation is explicitly provided with the request when opening the stream.&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;Currently, single-namespace change streams inherit the default collation of the collection for which they are filtering. This makes little sense, given that we are not actually querying documents from that collection; a so-called single-namespace change stream is, in reality, simply a filter on the oplog for that namespace. The current behaviour unintuitively restricts the client&apos;s ability to resume the stream, and is inconsistent with the semantics of whole-db and whole-cluster streams - both of which always use the simple collation unless explicitly provided with an alternative.&lt;/p&gt;

&lt;p&gt;To ensure stability with respect to the change stream&apos;s collation, and to guarantee that we can resume the stream in all circumstances, we should change the behaviour of single-namespace streams to be consistent with whole-db and whole-cluster streams.&lt;/p&gt;&lt;/blockquote&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&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></environment>
        <key id="715300">DOCS-12540</key>
            <summary>Docs for SERVER-39302: Change streams should always use the simple collation when no explicit collation is 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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="kay.kim@mongodb.com">Kay Kim</reporter>
                        <labels>
                    </labels>
                <created>Tue, 12 Mar 2019 12:53:34 +0000</created>
                <updated>Mon, 13 Nov 2023 18:24:27 +0000</updated>
                            <resolved>Tue, 28 May 2019 17:21:13 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2262176" author="xgen-internal-githook" created="Tue, 28 May 2019 17:19:48 +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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