[erlang-questions] process restarts and dropped messages

[Giovanni Giorgi]

Message sent are always successful.
This is my scenario: use gen_server behavior.
Client A has supervisor A.
Server  B has supervisor B.

if B crashes, client A will receive a badmessage (or no message at all).
So A will crash too.
The A supervisor will relaunch it, and also B supervisor will do the same for B.
So if this error is infrequent, all is fine.

Otherwise there is no easy way to fix it.


On 23/ago/2014, at 05:52, Chris Pacejo <colanderman@REDACTED> wrote:

> Hi list,
> 
> Consider the case of a gen_server which crashes and is restarted by
> its supervisor.  If the gen_server had outstanding casts in its
> mailbox, it will lose them.  If the server is restarted quickly
> enough, any clients communicating with it will be unaware of this
> crash, and thus unaware that these messages were dropped.
> 
> What is the standard way of avoiding this issue (assuming crashing the
> client is acceptable)?  Favor calls over casts?  Link to servers you
> need reliable communication with?  Use a reliable message broker?
> 
> Thanks.
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[    [   [  Giovanni ``Daitan`` Giorgi ]   ]    ] 
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