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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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<item>
            <title>[SERVER-33844] Change Streams - provide details for metadata operations instead of (or in addition to) invalidation</title>
                <link>https://jira.mongodb.org/browse/SERVER-33844</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When watching a database or entire cluster, provide notification of metadata events like collection drops and renames rather than invalidating the stream.   In case of watching a single collection, use the same format to provide details about invalidation (whether it was caused by collection drop, db drop, collection rename, etc).&lt;/p&gt;

&lt;p&gt;Original Description:&lt;/p&gt;

&lt;p&gt;Change streams report the namespace for operations such as inserts, updates and deletes. The namespace information would be useful in case of the invalidate event. &lt;/p&gt;

&lt;p&gt;Here is an example where the namespace would be extremely helpful:&lt;/p&gt;

&lt;p&gt;mdbsrv-01 &lt;br/&gt;
db1.coll1&lt;br/&gt;
db1.coll2&lt;br/&gt;
db1.coll3 &lt;/p&gt;

&lt;p&gt;Application thread-1 opens a change stream on db1.coll1 and thread-2 opens a change stream on db1.coll3. Everything captured from these collections will be send to mdbsrv-02, db2.do_it_now.&lt;/p&gt;

&lt;p&gt;If db1.coll1 gets dropped, the invalidate event is triggered and a invalidate document is inserted into mdbsrv-02, db2.do_it_now. The invalidate document only contains the _id and operationType: &quot;invalidate&quot;. &lt;/p&gt;

&lt;p&gt;By looking into db2.do_it_now, how do I know which collection has inserted the invalidate document into the collection? &lt;/p&gt;
</description>
                <environment></environment>
        <key id="510329">SERVER-33844</key>
            <summary>Change Streams - provide details for metadata operations instead of (or in addition to) invalidation</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="nicholas.zolnierz@mongodb.com">Nicholas Zolnierz</assignee>
                                    <reporter username="rodrigo@logwriter.net">Rodrigo Nascimento</reporter>
                        <labels>
                    </labels>
                <created>Tue, 13 Mar 2018 06:26:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:33:50 +0000</updated>
                            <resolved>Tue, 10 Jul 2018 17:30:40 +0000</resolved>
                                                    <fixVersion>4.1.1</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>1</votes>
                                    <watches>13</watches>
                                                                                                                <comments>
                            <comment id="1858399" author="asya" created="Sat, 7 Apr 2018 12:16:48 +0000"  >&lt;blockquote&gt;&lt;p&gt;namespace information would be useful in case of the invalidate event&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Since in the current version (3.6) you can only watch one collection at a time, the namespace is already available to the consumer of change events.&lt;/p&gt;

&lt;p&gt;In addition, invalidation is not meant to be interpreted as a &quot;change event&quot; - it is strictly an indication that the stream has been invalidated and cannot be continued transparently.&lt;/p&gt;

&lt;p&gt;However, since we are planning to allow watching more than one collection in a single change stream in the future, I&apos;m going to convert this ticket to an improvement request to provide notification of metadata events (collection or db drops, collection rename, etc) that on a single collection would be an invalidation.&lt;/p&gt;</comment>
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