Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/322#issuecomment-39551604
BTW, we might have to restore the context class loader of
`MesosExecutorBackend` to bootstrap class loader.
We should restore if there are 2 or more threads to handle
`MesosExecutorBackend`, but I don't know how many threads there are.
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