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https://issues.apache.org/jira/browse/SPARK-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-7121.
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Resolution: Fixed
Fix Version/s: 1.4.0
> ClosureCleaner does not handle nesting properly
> -----------------------------------------------
>
> Key: SPARK-7121
> URL: https://issues.apache.org/jira/browse/SPARK-7121
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Reporter: Andrew Or
> Assignee: Andrew Or
> Fix For: 1.4.0
>
>
> For instance, in SparkContext, I tried to do the following:
> {code}
> def scope[T](body: => T): T = body // no-op
> def myCoolMethod(path: String): RDD[String] = scope {
> parallelize(1 to 10).map { _ => path }
> }
> {code}
> and I got an exception complaining that SparkContext is not serializable. The
> issue here is that the inner closure is getting its path from the outer
> closure (the scope), but the outer closure actually references the
> SparkContext object itself to get the `parallelize` method.
> Note, however, that the inner closure doesn't actually need the SparkContext;
> it just needs a field from the outer closure. If we modify ClosureCleaner to
> clean the outer closure recursively while using the fields accessed by the
> inner closure, then we can serialize the inner closure.
> This is blocking my effort on a visualization task.
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