Github user haohui commented on the issue:
https://github.com/apache/flink/pull/3712
Thanks for the review. I'm not aware of the fact that OutputFormats are not
integrated with Flink's checkpointing mechanism.
To address this problem, maybe we can do something similar to the
`FlinkKafkaProducerBase`? What do you think @zentol and @aljoscha ?
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