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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2018/09/03 09:31:35 UTC

[GitHub] zentol opened a new pull request #6653: [FLINK-10235][kafka] Explicitly cast custom partitioner classes

zentol opened a new pull request #6653: [FLINK-10235][kafka] Explicitly cast custom partitioner classes
URL: https://github.com/apache/flink/pull/6653
 
 
   This PR fixes a jdk9 incompatibility regarding generics. The method compilation fails on java 9 since the CONNECTOR_SINK_PARTITIONER_VALUE_CUSTOM branch returns an Optional<Class<? extends FlinkKafkaPartitioner>>, but the method requires a Optional<FlinkKafkaPartitioner<Row>>.
   
   The compiler obviously cannot infer that the instantiated partitioner is always a `FlinkKafkaPartitioner<Row>` (since it technically could work on any type), so we have to help a bit.

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