Github user fanyon commented on the issue:
https://github.com/apache/flink/pull/3766
The new API should in a new class, such as FlinkKafkaPartitioner. For the
older KafkaPartitioner implementation, it will be delegated by
FlinkKafkaAdpterPartitioner extends FlinkKafkaPartitioner, in which contains
defaultTopicId/partitions and KafkaPartitioner delegate, and map the new api to
the current one in terms. Of course, as it is now, default topic's partitions
will be used for the diffrent target topics in FlinkKafkaAdpterPartitioner.
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