Github user joan38 commented on a diff in the pull request:
https://github.com/apache/spark/pull/11772#discussion_r56422280
--- Diff: mllib/src/main/scala/org/apache/spark/ml/util/ReadWrite.scala ---
@@ -282,7 +282,10 @@ private[ml] object DefaultParamsReader {
*/
def loadMetadata(path: String, sc: SparkContext, expectedClassName:
String = ""): Metadata = {
val metadataPath = new Path(path, "metadata").toString
- val metadataStr = sc.textFile(metadataPath, 1).first()
+ val metadataStr = try sc.textFile(metadataPath, 1).first() catch {
+ case _: UnsupportedOperationException =>
+ throw new IllegalArgumentException(s"Empty metadata for path
$path")
+ }
--- End diff --
Or
```scala
val textFile = sc.textFile(metadataPath, 1)
if (textFile.isEmpty()) throw new IllegalArgumentException(s"Empty
metadata for path $path")
val metadataStr = textFile.first()
```
But I thought calling twice `take(1)` threw `isEmpty()` and `first()` would
be a waist.
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