Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/14467#discussion_r79369158 --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala --- @@ -866,11 +866,14 @@ class BytesToString extends org.apache.spark.api.java.function.Function[Array[By } /** - * Internal class that acts as an `AccumulatorParam` for Python accumulators. Inside, it + * Internal class that acts as an `AccumulatorV2` for Python accumulators. Inside, it * collects a list of pickled strings that we pass to Python through a socket. */ -private class PythonAccumulatorParam(@transient private val serverHost: String, serverPort: Int) - extends AccumulatorParam[JList[Array[Byte]]] { +private[spark] class PythonAccumulatorV2(@transient private val serverHost: String, serverPort: Int) + extends AccumulatorV2[JList[Array[Byte]], JList[Array[Byte]]] { --- End diff -- I gave this a shot locally -- haven't tested it though. Does this make sense or do you see a reason this won't work? https://github.com/srowen/spark/commit/f13034bfeacb43d816c78a03e891ea46efa43607
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