Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/14467#discussion_r79149813 --- 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 -- Yeah, `CollectionAccumulator` would need you to add `Array[Byte]` to get out `List[Array[Byte]]`. But actually, the only thing that's added is a singleton list of one `Array[Byte]` so the usage is already expecting to add one element, not a list. Then you don't need a custom implementation at all. Just `CollectionAccumulator[Array[Byte]]`?
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