Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/3715#discussion_r23817918
--- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
---
@@ -371,54 +372,28 @@ private[spark] object PythonRDD extends Logging {
}
def writeIteratorToStream[T](iter: Iterator[T], dataOut:
DataOutputStream) {
- // The right way to implement this would be to use TypeTags to get the
full
- // type of T. Since I don't want to introduce breaking changes
throughout the
- // entire Spark API, I have to use this hacky approach:
- if (iter.hasNext) {
- val first = iter.next()
- val newIter = Seq(first).iterator ++ iter
- first match {
- case arr: Array[Byte] =>
- newIter.asInstanceOf[Iterator[Array[Byte]]].foreach { bytes =>
- dataOut.writeInt(bytes.length)
- dataOut.write(bytes)
- }
- case string: String =>
- newIter.asInstanceOf[Iterator[String]].foreach { str =>
- writeUTF(str, dataOut)
- }
- case stream: PortableDataStream =>
- newIter.asInstanceOf[Iterator[PortableDataStream]].foreach {
stream =>
- val bytes = stream.toArray()
- dataOut.writeInt(bytes.length)
- dataOut.write(bytes)
- }
- case (key: String, stream: PortableDataStream) =>
- newIter.asInstanceOf[Iterator[(String,
PortableDataStream)]].foreach {
- case (key, stream) =>
- writeUTF(key, dataOut)
- val bytes = stream.toArray()
- dataOut.writeInt(bytes.length)
- dataOut.write(bytes)
- }
- case (key: String, value: String) =>
- newIter.asInstanceOf[Iterator[(String, String)]].foreach {
- case (key, value) =>
- writeUTF(key, dataOut)
- writeUTF(value, dataOut)
- }
- case (key: Array[Byte], value: Array[Byte]) =>
- newIter.asInstanceOf[Iterator[(Array[Byte],
Array[Byte])]].foreach {
- case (key, value) =>
- dataOut.writeInt(key.length)
- dataOut.write(key)
- dataOut.writeInt(value.length)
- dataOut.write(value)
- }
- case other =>
- throw new SparkException("Unexpected element type " +
first.getClass)
- }
+
+ def write(obj: Any): Unit = obj match {
--- End diff --
This JavaRDD could only be String, Array[Byte], Stream, or a pair of them.
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