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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>[SERVER-39143] Add noop-event to Change stream</title>
                <link>https://jira.mongodb.org/browse/SERVER-39143</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When you listening changeStream for collection with rare updates, you have not any knowledge about:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;you don&apos;t reciving event because nothing happens or somethins broken?&lt;/li&gt;
	&lt;li&gt;what processing events delay do you have (you can get unpredictable delay on changeStream resuming)?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Also you can&apos;t update refresh token without receiving changeStream event.&lt;/p&gt;

&lt;p&gt;So, I think should be some `noop` event for changeStream (optional or with configurable period).&lt;/p&gt;</description>
                <environment></environment>
        <key id="676494">SERVER-39143</key>
            <summary>Add noop-event to Change stream</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="bernard.gorman@mongodb.com">Bernard Gorman</assignee>
                                    <reporter username="bozaro">Artem</reporter>
                        <labels>
                    </labels>
                <created>Wed, 23 Jan 2019 07:49:43 +0000</created>
                <updated>Mon, 28 Jan 2019 11:46:09 +0000</updated>
                            <resolved>Mon, 28 Jan 2019 11:46:09 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="2128937" author="bernard.gorman" created="Mon, 28 Jan 2019 11:45:53 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bozaro&quot; class=&quot;user-hover&quot; rel=&quot;bozaro&quot;&gt;bozaro&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Many thanks for your comments, and for highlighting this issue. As it happens, we are currently in the process of implementing exactly the functionality you describe. The work involved in doing so is tracked under the umbrella ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35740&quot; title=&quot;Report high-water-mark resume token with each (possibly empty) change stream batch&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35740&quot;&gt;&lt;del&gt;SERVER-35740&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;In broad terms, this project will ensure that every change stream batch returned from the server, whether empty or not, will include a resume token indicating the latest point from which it is safe to resume the stream. Even when the stream is not returning any events, the so-called &quot;high water mark&quot; token will continue to advance over time. In cases where a stream is waiting for events that occur very infrequently, therefore, your application will both be able to verify that the stream is still actively monitoring the collection, and it will be able to update its resume token without having to wait until the next event.&lt;/p&gt;

&lt;p&gt;Since we already have a ticket to track this work, I&apos;m going to close this ticket as a duplicate of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-35740&quot; title=&quot;Report high-water-mark resume token with each (possibly empty) change stream batch&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-35740&quot;&gt;&lt;del&gt;SERVER-35740&lt;/del&gt;&lt;/a&gt;. Please feel free to set yourself as a Watcher on that ticket, and to ask any further questions you may have!&lt;/p&gt;

&lt;p&gt;Best regards,&lt;br/&gt;
Bernard&lt;/p&gt;</comment>
                            <comment id="2123987" author="ramon.fernandez" created="Wed, 23 Jan 2019 12:58:40 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bozaro&quot; class=&quot;user-hover&quot; rel=&quot;bozaro&quot;&gt;bozaro&lt;/a&gt;, sending it to the Query team for consideration.&lt;/p&gt;</comment>
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