Ngone51 commented on issue #27599: [SPARK-30846][CORE] Add AccumulatorV2 API in JavaSparkContext URL: https://github.com/apache/spark/pull/27599#issuecomment-590711791 In general, **java-friendly** really refer to: https://github.com/apache/spark/blob/56e9e97073cf1896e301371b3941c9307e42ff77/core/src/main/scala/org/apache/spark/api/java/JavaSparkContext.scala#L40-L41 But, practically, developers do have added duplicate APIs to `JavaSparkContext` as @HyukjinKwon mentioned.
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