Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3705#issuecomment-67907847
> so I think all accesses to that field will be serialized by Akka.
Hmm, I'm not so sure. From the page you linked:
> processing of one message happens before processing of the next message
by the same actor.
I read that sentence as: "messages from the same sender are processed in
order", not "each receiver will only process one message at a time".
`Worker.receiveWithLogging` handles messages from both `Master` and `Executor`,
and both could cause `appDirectories` to be modified.
Anyway, in these cases I tend to err on the side of safety; the extra
synchronization here shouldn't cause any performance issues.
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