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`.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
