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https://issues.apache.org/jira/browse/FLINK-15221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16995247#comment-16995247
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chaiyongqiang commented on FLINK-15221:
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[~jark] thanks . You're right . But i've  checked the kafkatablesink. I don't 
think an overwrite of 'KafkaTableSink' and 'KafkaTableSourceSinkFactory'  is a 
perfect way to gain the end-to-end exactly-once semantic when a user develops 
an app .   It's a too complex for a flink app developer and it makes him focus 
too much on the details of flink. I think   we'd better expose a semantic 
configuration for app users to set when they want exectly-once semantic. 

 
You can have a look at the following issue i opened. How do you think about it?

[FLINK-14719|https://issues.apache.org/jira/projects/FLINK/issues/FLINK-14719?filter=allopenissues]

> supporting Exactly-once for table APi
> -------------------------------------
>
>                 Key: FLINK-15221
>                 URL: https://issues.apache.org/jira/browse/FLINK-15221
>             Project: Flink
>          Issue Type: Wish
>          Components: Table SQL / API
>            Reporter: chaiyongqiang
>            Priority: Major
>
> The Table Api doesn't support End to End Exactly once sematic like datastream 
> Api.  Does Flink have a plan for this?



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