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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-33745] ChangeStream clientSession passed to change event</title>
                <link>https://jira.mongodb.org/browse/SERVER-33745</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We have many (&amp;gt;1) applications making changing to the same collections it would be nice to determine which client/application instigated the change in the database.  &lt;/p&gt;

&lt;p&gt;Currently the only solution is maintaining some state in the object itself.&lt;/p&gt;

&lt;p&gt;Ideally when we listen to stream.on(&apos;change&apos;, (change, &lt;b&gt;clientSession&lt;/b&gt;) =&amp;gt; { } );&lt;br/&gt;
a new clientSession parameter could be provided.  This would be the clientSession of the process that inserted/updated/deleted the object, not the local listener clientSession.&lt;/p&gt;

&lt;p&gt;Is this possible?&lt;br/&gt;
TIA&lt;br/&gt;
Kevin Fairclough&lt;/p&gt;</description>
                <environment></environment>
        <key id="507760">SERVER-33745</key>
            <summary>ChangeStream clientSession passed to change event</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="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="2">Won&apos;t Fix</resolution>
                                        <assignee username="asya.kamsky@mongodb.com">Asya Kamsky</assignee>
                                    <reporter username="KevinFairclough">Kevin Fairclough</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Mar 2018 14:40:21 +0000</created>
                <updated>Sat, 7 Apr 2018 12:13:51 +0000</updated>
                            <resolved>Sat, 7 Apr 2018 12:13:51 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1858393" author="asya" created="Sat, 7 Apr 2018 12:13:51 +0000"  >&lt;blockquote&gt;&lt;p&gt;Currently the only solution is maintaining some state in the object itself.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;This is the only correct solution.   Change streams is a server-side feature, and in order for it to provide such information, the server would have to save in the oplog information about client session which made the write operation.  This does not seem like correct approach so our recommendation is to have client write the necessary information into the object itself if this information is needed downstream.&lt;/p&gt;</comment>
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