Bill Chambers created SPARK-14708:
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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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