[jira] [Updated] (SPARK-4170) Closure problems when running Scala app that "extends App"

["Tony Stevenson (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-4170?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tony Stevenson updated SPARK-4170:
----------------------------------
    Assignee: Sean Owen  (was: Sean Owen)

> Closure problems when running Scala app that "extends App"
> ----------------------------------------------------------
>
>                 Key: SPARK-4170
>                 URL: https://issues.apache.org/jira/browse/SPARK-4170
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.1.0
>            Reporter: Sean Owen
>            Assignee: Sean Owen
>            Priority: Minor
>
> Michael Albert noted this problem on the mailing list (http://apache-spark-user-list.1001560.n3.nabble.com/BUG-when-running-as-quot-extends-App-quot-closures-don-t-capture-variables-td17675.html):
> {code}
> object DemoBug extends App {
>     val conf = new SparkConf()
>     val sc = new SparkContext(conf)
>     val rdd = sc.parallelize(List("A","B","C","D"))
>     val str1 = "A"
>     val rslt1 = rdd.filter(x => { x != "A" }).count
>     val rslt2 = rdd.filter(x => { str1 != null && x != "A" }).count
>     
>     println("DemoBug: rslt1 = " + rslt1 + " rslt2 = " + rslt2)
> }
> {code}
> This produces the output:
> {code}
> DemoBug: rslt1 = 3 rslt2 = 0
> {code}
> If instead there is a proper "main()", it works as expected.
> I also this week noticed that in a program which "extends App", some values were inexplicably null in a closure. When changing to use main(), it was fine.
> I assume there is a problem with variables not being added to the closure when main() doesn't appear in the standard way.



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