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    <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>[DOCS-13757] [KAFKA] Add delivery guarantee to source and sink</title>
                <link>https://jira.mongodb.org/browse/DOCS-13757</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;p&gt;There has been some questions around delivery guarantee of data to and from the topic with respect to exactly once, at least once, etc. We should add this delivery information explicitly to the documentation for both source and sink.&lt;/p&gt;

&lt;p&gt;Answered by Robert in the forums here:&#160;&lt;a href=&quot;https://developer.mongodb.com/community/forums/t/kafka-connector-delivery-guarantees/8757&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://developer.mongodb.com/community/forums/t/kafka-connector-delivery-guarantees/8757&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;For sink default is At Least Once. If there is an error when processing data from a topic the connector will retry the write. However, if the data on the topic contains a unique attribute, it is possible to achieve exactly once semantics by configuring the Sink connector to use upserts and the DocumentIdAdder strategy. The sink connector can not support at most once.&lt;/p&gt;

&lt;p&gt;For source default is At least once. There is a risk of duplicate messages if you use copy.existing. Note that change stream events are idempotent so the need to support other delivery guarantees are not applicable.&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;p&gt;All versions&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;
&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;</description>
                <environment></environment>
        <key id="1405194">DOCS-13757</key>
            <summary>[KAFKA] Add delivery guarantee to source and sink</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="chris.cho@mongodb.com">Christopher Cho</assignee>
                                    <reporter username="robert.walters@mongodb.com">Robert Walters</reporter>
                        <labels>
                            <label>kafka-connect</label>
                    </labels>
                <created>Thu, 9 Jul 2020 16:10:57 +0000</created>
                <updated>Sun, 29 Oct 2023 13:54:59 +0000</updated>
                            <resolved>Fri, 11 Sep 2020 15:30:18 +0000</resolved>
                                                                    <component>Kafka</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3385563" author="chris.cho" created="Thu, 10 Sep 2020 15:58:01 +0000"  >&lt;p&gt;PR ready for review:&#160;&lt;a href=&quot;https://github.com/10gen/docs-kafka-connector/pull/44&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-kafka-connector/pull/44&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3381127" author="chris.cho" created="Tue, 8 Sep 2020 23:28:54 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=robert.walters&quot; class=&quot;user-hover&quot; rel=&quot;robert.walters&quot;&gt;robert.walters&lt;/a&gt;&#160;quick question:&lt;/p&gt;

&lt;p&gt;When you mention that you need to use &quot;upserts and the DocumentIdAdder strategy&quot; to get an exactly-once guarantee, what configuration controls whether it&apos;s upserts?&lt;/p&gt;</comment>
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