[jira] [Created] (SPARK-14708) Repl Serialization Issue

["Bill Chambers (JIRA)" <ji...@apache.org>]

Bill Chambers created SPARK-14708:
-------------------------------------

             Summary: Repl Serialization Issue
                 Key: SPARK-14708
                 URL: https://issues.apache.org/jira/browse/SPARK-14708
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
            Reporter: Bill Chambers
            Priority: Critical


Run this code 6 times with the :paste command in Spark. You'll see exponential slow downs.

class IntWrapper(val i: Int) extends Serializable {  }
 
var pairs = sc.parallelize(Array((0, new IntWrapper(0))))
 
for (_ <- 0 until 3) {
  val wrapper = pairs.values.reduce((x,_) => x)
  pairs = pairs.mapValues(_ => wrapper)
}
val result = pairs.collect()


https://forums.databricks.com/questions/7729/delays-when-running-program-multiple-times-in-note.html



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