Aaron Davidson created SPARK-1866:
-------------------------------------
Summary: 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
Affects Versions: 1.0.0
Reporter: Aaron Davidson
Priority: Critical
Fix For: 1.1.0, 1.0.1
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.
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