Github user holdenk commented on a diff in the pull request: https://github.com/apache/spark/pull/14467#discussion_r73411677 --- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala --- @@ -889,21 +891,40 @@ private class PythonAccumulatorParam(@transient private val serverHost: String, socket } - override def zero(value: JList[Array[Byte]]): JList[Array[Byte]] = new JArrayList + override def reset(): Unit = { + this._acc = new JArrayList[Array[Byte]] + } + + override def isZero: Boolean = { + this._acc.isEmpty + } - override def addInPlace(val1: JList[Array[Byte]], val2: JList[Array[Byte]]) - : JList[Array[Byte]] = synchronized { + override def copy(): PythonAccumulatorV2 = { + val newAcc = new PythonAccumulatorV2(serverHost, serverPort) + newAcc._acc = this._acc --- End diff -- Yah `copy()` could be used elsewhere besides inside of `copyAndReset()` - although I don't see any blindingly obvious places where it is used inside of Spark. I'll switch this to be more like the `CollectionAccumulator` and have a specialized `copyAndReset` and do a deep copy on `copy`.
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