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Re:Apache Spark building on Scala 2.12 by mightyhops on Thursday August 02, 2018 @07:30PM (#17676305)
This was a long and major effort, awesome to see it completed. I believe the underlying issue holding Flink back from 2.12 support was also the ClosureCleaner taken from Spark[0].

[0] https://github.com/apache/flink/blob/dacc16b4fa6db6abfdbf73b...