JavaPaidRDD class creates instances of scala.math.Ordering<K>. I've been able to view the code with Fernflower decompiler in IntelliJ IDEA. For K=Integer, one can do: "Ordering<Integer> ordering = Ordering$.MODULE$.comparatorToOrdering(Comparator.<Integer>naturalOrder())" or implement Comparator directly. But beware... "Ordering$.MODULE$" is the static reference, and thus is not Serializable. So, the whole class performing calculation should implement Serializable.
I do have a working example of RDD.countByValue(Ordering<K>) in Java. I'm guessing the creators of scala.math.* wanted those classes to be used in Scala, not in Java (and Scala doesn't have static references). -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/How-to-use-scala-math-Ordering-in-java-tp26019p26218.html Sent from the Apache Spark User List mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@spark.apache.org For additional commands, e-mail: user-h...@spark.apache.org
