Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/771#issuecomment-43535796
@ScrapCodes, I definitely like the idea. I think we need to update the API
a little before it's ready to be publicly accessible, though. First,
LeaderElectionAgent and PersistenceEngine should be `@DeveloperApi` and not
`private[spark]`.
Second, LeaderElectionAgent should be refactored to not be an Actor (there
is a TODO since the Curator refactor, I think it just needs to be done before
we can finalize this API). This should be pretty straightforward to do, I would
just add a trait like
```scala
trait LeaderElectable {
def electedLeader()
def revokedLeadership()
}
```
which Master implements by simply calling `self ! ElectedLeader`, for
instance, to ensure we maintain the thread safety of the actor without leaking
the actor abstraction.
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