zhengruifeng commented on code in PR #53150:
URL: https://github.com/apache/spark/pull/53150#discussion_r2550004092
##########
mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala:
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@@ -1142,4 +1144,47 @@ private[spark] object ReadWriteUtils {
spark.read.parquet(path).as[T].collect()
}
}
+
+ def saveDataFrame(path: String, df: DataFrame): Unit = {
+ if (localSavingModeState.get()) {
+ val filePath = Paths.get(path)
+ Files.createDirectories(filePath.getParent)
+
+ Using.resource(
+ new ObjectOutputStream(new BufferedOutputStream(new
FileOutputStream(filePath.toFile)))
+ ) { oos =>
+ val schema: StructType = df.schema
+ oos.writeObject(schema)
+ val it = df.toLocalIterator()
+ while (it.hasNext) {
+ oos.writeBoolean(true) // hasNext = True
+ val row: Row = it.next()
+ oos.writeObject(row)
+ }
+ oos.writeBoolean(false) // hasNext = False
+ }
+ } else {
+ df.write.parquet(path)
+ }
+ }
+
+ def loadDataFrame(path: String, spark: SparkSession): DataFrame = {
+ if (localSavingModeState.get()) {
+ Using.resource(
+ new ObjectInputStream(new BufferedInputStream(new
FileInputStream(path)))
+ ) { ois =>
+ val schema = ois.readObject().asInstanceOf[StructType]
Review Comment:
resort to arrow format suggested by @cloud-fan
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