Github user MattWhelan commented on the pull request:
https://github.com/apache/spark/pull/3233#issuecomment-71116000
Sorry, "cache" was vague. It's often called that, but what it really
refers to is the call to findLoadedClass(name) near the top of the loadClass
method in ClassLoader. That call looks up the name in this CL's cache. The
actual implementation is a native method in the JVM, not some sort of data
structure it ClassLoader itself.
Since you're calling findClass before findLoadedClass, you're going to
defineClass on the same class more than once, in some cases, which throws that
LinkageError
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