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https://issues.apache.org/jira/browse/FLINK-11320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17328494#comment-17328494
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Flink Jira Bot commented on FLINK-11320:
----------------------------------------

This major issue is unassigned and itself and all of its Sub-Tasks have not 
been updated for 30 days. So, it has been labeled "stale-major". If this ticket 
is indeed "major", please either assign yourself or give an update. Afterwards, 
please remove the label. In 7 days the issue will be deprioritized.

> Support user callback in Kafka sink
> -----------------------------------
>
>                 Key: FLINK-11320
>                 URL: https://issues.apache.org/jira/browse/FLINK-11320
>             Project: Flink
>          Issue Type: Improvement
>          Components: Connectors / Kafka
>            Reporter: Allen Wang
>            Priority: Major
>              Labels: pull-request-available, stale-major
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> We would like to get notified when Flink's Kafka sink successfully produces a 
> message to the Kafka cluster for message tracing purposes. The callback 
> should be created for the specific item being produced. Currently this 
> functionality is inside Flink's internal code and not accessible to the user. 
> This change would allow user to get callback when a message is produced in 
> the sink:
>  * Add a new interface {{UserCallbackFactory}}:
> {code:java}
> public interface UserCallbackFactory<IN> {
>     Callback create(IN next);
> }{code}
>  * Add new constructor in {{FlinkKafkaProducer}} to pass in an optional 
> argument of {{UserCallbackFactory}}
>  * In the  {{FlinkKafkaProducer.invoke}} method, create a user callback given 
> the produced item and invoke this callback.
>  
>  



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