Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/15#issuecomment-38757007
`LocalActor` has 4 threads to handle Actor messages but the replacement of
the ContextClassLoader happens only one of them.
I believe that the **UNBALANCED** state is not desirable.
Your patch can fix my original problem but the undesirable state remains.
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