What types of RDD can saveAsObjectFile(path) handle? I tried a naive test with an RDD[Array[String]], but when I tried to read back the result with sc.objectFile(path).take(5).foreach(println), I got a non-promising output looking like:
[Ljava.lang.String;@46123a [Ljava.lang.String;@76123b [Ljava.lang.String;@13144c [Ljava.lang.String;@75146d [Ljava.lang.String;@79118f Arun
