koert kuipers created SPARK-1863:
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Summary: Allowing user jars to take precedence over Spark jars
does not work as expected
Key: SPARK-1863
URL: https://issues.apache.org/jira/browse/SPARK-1863
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 1.0.0
Reporter: koert kuipers
Priority: Minor
See here:
http://apache-spark-user-list.1001560.n3.nabble.com/java-serialization-errors-with-spark-files-userClassPathFirst-true-td5832.html
The issue seems to be that within ChildExecutorURLClassLoader userClassLoader
has no visibility on classes managed by parentClassLoader because their is no
parent/child relationship. What this means that if a class is loaded by
userClassLoader and it refers to a class loaded by parentClassLoader you get a
NoClassDefFoundError.
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