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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-84198] Facilitate multiple collations within the same change stream.</title>
                <link>https://jira.mongodb.org/browse/SERVER-84198</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Mongosync applies document queries in two contexts:&lt;br/&gt;
1) partitioning during initial sync&lt;br/&gt;
2) cluster-wide change streams&lt;/p&gt;

&lt;p&gt;The initial-sync queries are per-collection and so use each collection&apos;s default collation. The change stream, though, is multi-collection, so it&apos;s simple-collated. Thus, if we search on &quot;&amp;#95;id &amp;gt; aaa &amp;amp;&amp;amp; &amp;#95;id &amp;lt; zzz&quot; we&apos;ll match &amp;#95;id=BBB during initial sync but not in the change stream.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82815&quot; title=&quot;Expose server&#8217;s index key creation via aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82815&quot;&gt;&lt;del&gt;SERVER-82815&lt;/del&gt;&lt;/a&gt; will provide a solution for this by allowing aggregation to convert &amp;#95;id, aaa,  zzz, and BBB to whatever byte sequence the server uses to represent them in indexes.&lt;/p&gt;

&lt;p&gt;This problem worsens in the context of &lt;span class=&quot;error&quot;&gt;&amp;#91;document filtering|REP-1954&amp;#93;&lt;/span&gt;, where the query will come from the customer. Here we either have to limit the scope of support for strings in queries pretty dramatically or implement some sort of query-transform logic based on &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-82815&quot; title=&quot;Expose server&#8217;s index key creation via aggregation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82815&quot;&gt;&lt;del&gt;SERVER-82815&lt;/del&gt;&lt;/a&gt;&apos;s new operator ... but even that would likely only support certain limited use cases.&lt;/p&gt;

&lt;p&gt;We can soften the problem somewhat by having customers migrate like-collated collections in concurrent mongosync sessions. Given limitations on the # of concurrent change streams, though, this won&apos;t scale well to multi-tenant setups where dozens, even hundreds, of collations may coexist on a given source cluster.&lt;/p&gt;

&lt;p&gt;It seems that, ultimately, we can&apos;t &quot;gracefully&quot; support collations without &lt;em&gt;some&lt;/em&gt; ability to apply multiple collations in a given change stream.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2525407">SERVER-84198</key>
            <summary>Facilitate multiple collations within the same change stream.</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="felipe.gasper@mongodb.com">Felipe Gasper</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Dec 2023 19:31:15 +0000</created>
                <updated>Tue, 26 Dec 2023 17:29:20 +0000</updated>
                            <resolved>Tue, 26 Dec 2023 17:29:20 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
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