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https://issues.apache.org/jira/browse/FLINK-7210?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Nowojski updated FLINK-7210:
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    Description: To implement exactly-once sink there is a re-occurring pattern 
for doing it - two phase commit algorithm. It is used both in `BucketingSink` 
and in `Pravega` sink and it will be used in `Kafka 0.11` connector. It would 
be good to extract this common logic into one class, both to improve existing 
implementation (for exampe `Pravega`'s sink doesn't abort interrupted 
transactions) and to make it easier for the users to implement their own custom 
exactly-once sinks.  (was: To implement exactly-once sink there is a 
re-occurring pattern for doing it - two phase commit algorithm. It is used both 
in `BucketedSink` and in `Pravega` sink and it will be used in `Kafka 0.11` 
connector. It would be good to extract this common logic into one class, both 
to improve existing implementation (for exampe `Pravega`'s sink doesn't abort 
interrupted transactions) and to make it easier for the users to implement 
their own custom exactly-once sinks.)

> Add TwoPhaseCommitSinkFunction (implementing exactly-once semantic in generic 
> way)
> ----------------------------------------------------------------------------------
>
>                 Key: FLINK-7210
>                 URL: https://issues.apache.org/jira/browse/FLINK-7210
>             Project: Flink
>          Issue Type: Improvement
>            Reporter: Piotr Nowojski
>            Assignee: Piotr Nowojski
>
> To implement exactly-once sink there is a re-occurring pattern for doing it - 
> two phase commit algorithm. It is used both in `BucketingSink` and in 
> `Pravega` sink and it will be used in `Kafka 0.11` connector. It would be 
> good to extract this common logic into one class, both to improve existing 
> implementation (for exampe `Pravega`'s sink doesn't abort interrupted 
> transactions) and to make it easier for the users to implement their own 
> custom exactly-once sinks.



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