[erlang-questions] Is supervisor notified when child is restarted?
Tue Jul 28 22:25:21 CEST 2015
Thank you for your time and information. Process groups sound
interesting. I will dig deeper.
On 7/28/2015 6:24 PM, Sean Cribbs wrote:
> Woops, forgot to include the link:
>  http://erlang.org/doc/man/pg2.html
> On Tue, Jul 28, 2015 at 10:23 AM, Sean Cribbs <seancribbs@REDACTED
> <mailto:seancribbs@REDACTED>> wrote:
> Hi Martin,
> It sounds like you need either to use either registered names,
> process groups, or the one_for_all strategy. Registered processes
> are the easiest way, you can simply refer to them by the atom --
> but you must expect that sometimes messages will be lost if the
> process is restarting. Alternately, if you change this
> supervisor's strategy to one_for_all you will ensure that every
> process always has the correct state (assuming it already starts
> up in the correct state), but existing work from non-failed
> processes can be lost. For process groups, you can use pg2 
> which comes with OTP, or there are several alternate
> implementations available on github, but messaging the other
> processes in this small group will incur additional overhead.
> Each solution has tradeoffs, I hope that helps you decide which
> one to use.
> On Tue, Jul 28, 2015 at 10:03 AM, Martin Koroudjiev
> <mrtndimitrov@REDACTED <mailto:mrtndimitrov@REDACTED>> wrote:
> I am wondering how can I get notified when a child process is
> Imagine this simple scenario - supervisor with one_for_one
> strategy and
> 3 gen_servers as workers. Each in its state has the PIDs of
> the other 2
> and sends them messages. Now if one child gets restarted, the
> other 2
> will have the old PID. How can I notify them?
> I can't restart the whole supervision tree because the number
> of child
> processes is buried deep in the initialization logic of the
> erlang-questions mailing list
> erlang-questions@REDACTED <mailto:erlang-questions@REDACTED>
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