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

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

    [ https://issues.apache.org/jira/browse/SPARK-14708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15246230#comment-15246230 ] 

Bill Chambers commented on SPARK-14708:
---------------------------------------

cc:[~joshrosen]

> 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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