Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/4293#discussion_r23885864
--- Diff: core/src/main/scala/org/apache/spark/rdd/HadoopRDD.scala ---
@@ -308,6 +309,14 @@ class HadoopRDD[K, V](
// Do nothing. Hadoop RDD should not be checkpointed.
}
+ override def persist(storageLevel: StorageLevel): this.type = {
+ if (storageLevel.deserialized) {
+ throw new SparkException("Can't cache HadoopRDDs as deserialized
objects because Hadoop's" +
--- End diff --
+1; I had a recent PR that added some similar errors / warnings for common
user mistakes, but I only raised exceptions for branches of the code that threw
errors (e.g. NPE) 100% of the time. Let's make this into a warning.
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