Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/322#issuecomment-39543185
Hi,
I think `MesosExecutorBackend` should have own `ContextClassLoader` and it
should be set to the class loader of `MesosExecutorBackend` class before it
creates `Executor` object.
I mistakenly thought that `MesosExecutorBackend` has own context class
loader, but it doesn't. While creating `SparkEnv` in the `Executor`'s
constructor, `Thread.currentThread.getContextClassLoader` returns `null`
because `MesosExecutorBackend` doesn't have context class loader.
`Class.forName()` method with `null` for 3rd argument tries to load class from
bootstrap class loader, which doesn't know the class
`org.apache.spark.serializer.JavaSerializer`.
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