Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/4512#issuecomment-73834654
@ScrapCodes , I just realized that we may not be able to provide an empty
class for failure detector
because in some cases, the user needs to connect external akka system with
spark's actor system, if an empty class does not send any heartbeat...the
external akka system will always disassociate with it...
if we send heartbeat in the empty class...how about the frequency?
So...I think leaving the large interval for sending heartbeat might be
better...at least it provides some interface for the external system to
integrate...
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