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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-40437] [Change Streams] Allow to recognize last change of transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-40437</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I&apos;m using Mongo change streams to send database changes in realtime from my node backend to an angular webapplication.&lt;/p&gt;

&lt;p&gt;When I mutate a lot of data rows using a transaction, I want to send those changes to the client as one accumulated change and not one by one.&lt;/p&gt;

&lt;p&gt;To achive that, I queue new changes if they are part of a transaction.&lt;/p&gt;

&lt;p&gt;And here starts my problem:&lt;/p&gt;

&lt;p&gt;How to identify the last change event of a transaction? At the moment I set a timeout and wait if another change with the same lsid arrives within the timeout. If not I consider the transaction complete.&lt;/p&gt;

&lt;p&gt;Aside from being a very ugly hack, this has two severe downside:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;If the timeout is too short, I can&apos;t rely on the transaction changes to arrive fast enough&lt;/li&gt;
	&lt;li&gt;The timeouts accumulate and lead (in case of transactions affecting a lot of documents) to very high response times on the client side&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I think the best solution would be to either set a flag on the change event (something like a &quot;last&quot; or &quot;finished&quot; boolean in addition to the lsid)&#160;or emit a specific event in the stream after a transaction&apos;s last change.&lt;/p&gt;

&lt;p&gt;If anybody has already solved that issue in another fashion, please let me know.&lt;/p&gt;

&lt;p&gt;Thanks very much!&lt;/p&gt;</description>
                <environment></environment>
        <key id="727879">SERVER-40437</key>
            <summary>[Change Streams] Allow to recognize last change of transaction</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="stefanholzapfel">Stefan Holzapfel</reporter>
                        <labels>
                            <label>change-streams-improvements</label>
                    </labels>
                <created>Tue, 2 Apr 2019 12:11:52 +0000</created>
                <updated>Fri, 13 Jan 2023 12:15:41 +0000</updated>
                                            <version>4.0.8</version>
                                                    <component>Querying</component>
                                        <votes>4</votes>
                                    <watches>23</watches>
                                                                                                                <comments>
                            <comment id="2203996" author="stefanholzapfel" created="Fri, 5 Apr 2019 21:06:09 +0000"  >&lt;p&gt;Great, thx!&lt;/p&gt;</comment>
                            <comment id="2203943" author="eric.sedor" created="Fri, 5 Apr 2019 20:31:04 +0000"  >&lt;p&gt;Thanks for your request &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=stefanholzapfel&quot; class=&quot;user-hover&quot; rel=&quot;stefanholzapfel&quot;&gt;stefanholzapfel&lt;/a&gt;. We&apos;re assigning this ticket to the appropriate team to be evaluated against our currently planned work. Updates will be posted on this ticket as they happen.&lt;/p&gt;</comment>
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