On Saturday, January 18, 2014 4:26:32 PM UTC, Jatin Puri wrote: > > Hi Alistair, > > Thanks. How safe would you consider it in case of implementing a > distributed cache like structure. > I presume a single attempt will be considered alright. Because if it > doesn't end up in a single attempt, there are hardly any chances it will > succeed on the next attempt. > > On Saturday, 18 January 2014 12:50:22 UTC+5:30, Alistair George wrote: >> >> >> >> On Friday, January 17, 2014 6:47:47 PM UTC, Jatin Puri wrote: >>> >>> I have an application where actors will normally be deployed remotely >>> rather than locally. There will be one leader actor and the rest will >>> be its junior. >>> >>> Now the leader needs to know if the junior is alive or dead or not >>> reachable. As to distinguish deadwith not reachable I have decided to >>> have a convention that: If an actor is not reachable, it can be considered >>> dead. (Is this assumption safe?) >>> >> Whether this is safe or not depends on what the junior actor is doing. >> Consider the case where the junior actor is an automated trading system, >> and one of the functions of the leader is to stop the junior trading when a >> user presses a "panic button". If the junior is dead, it's not trading and >> this is safe. If it's alive but unreachable, it is out of control and >> unsafe. >> >> However, if the junior only responds to work sent to it by the leader, >> then unreachable and dead are pretty much equivalent. The awkward case is >> where the junior acts autonomously and the leader needs to control it >> reliably. >> >> Alistair >> >> So now to know if a remote actor is dead or alive: One way is to keep >>> polling repeatedly. Though I normally use context.watch for this >>> purpose. Now the question is: How expensive is DeathWatch. What is the >>> inner mechanism? As load-test would it be safe if I have an actor that is >>> watching 100's of actors if not thousands? >>> >>> What would be the other ideal way to know if a remote actor is alive or >>> dead? >>> >>
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