Github user srowen commented on a diff in the pull request: https://github.com/apache/spark/pull/14467#discussion_r73407720 --- 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 -- OK but this keeps the original accumulator's data -- it even makes both point to the same instance of the data. I suspect I'm missing something.
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