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https://issues.apache.org/jira/browse/SPARK-1866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-1866:
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Component/s: Spark Core
> Closure cleaner does not null shadowed fields when outer scope is referenced
> ----------------------------------------------------------------------------
>
> Key: SPARK-1866
> URL: https://issues.apache.org/jira/browse/SPARK-1866
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.0.0
> Reporter: Aaron Davidson
> Assignee: Kan Zhang
> Priority: Critical
>
> Take the following example:
> {code}
> val x = 5
> val instances = new org.apache.hadoop.fs.Path("/") /* non-serializable */
> sc.parallelize(0 until 10).map { _ =>
> val instances = 3
> (instances, x)
> }.collect
> {code}
> This produces a "java.io.NotSerializableException:
> org.apache.hadoop.fs.Path", despite the fact that the outer instances is not
> actually used within the closure. If you change the name of the outer
> variable instances to something else, the code executes correctly, indicating
> that it is the fact that the two variables share a name that causes the issue.
> Additionally, if the outer scope is not used (i.e., we do not reference "x"
> in the above example), the issue does not appear.
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