[erlang-patches] Supervisor improvements

Henrik Nord <>
Thu Sep 15 09:19:27 CEST 2011

On 09/14/2011 06:00 PM, Christopher Faulet wrote:
> Le 14/09/2011 11:51, Siri Hansen a écrit :
>> I have discussed the simple_one_for_one_shutdown problem with my
>> colleagues, and finally we came to the same conclusion as you did :) The
>> current behavior is definitely not acceptable so we decided to take in
>> you patch. If you don't mind I would however like you to do some minor
>> adjustments first:
>> 1) I think it would be good to document the differences in how shutdown
>> is handled for simple_one_for_one supervisors compared to other
>> supervisors. I.e. that there is no defined shutdown order, and that the
>> workers will terminate "in parallel".
>> 2) If the shutdown strategy for the dynamic children is a timer, and the
>> timer expires - then it looks like there will be one error report
>> printed per worker that is not yet terminated (please correct me if I'm
>> wrong). I believe that this could be quite heavy if there are many
>> workers left. I would suggest to print only one error report in this
>> situation - either listing all pids or just say how many processes we
>> are talking about.
>> Also, as Henrik writes, your supervisor_shutdown_infinity patch is
>> already included in pu. Before finally including it in our development
>> branch, I would also like you to add some more information to the
>> documentation (a warning?) - about using this feature with care, and if
>> you need to use it then implement the worker in a safe way so the
>> cleanup procedure can not hang... since this can actually cause the
>> termination of the complete supervisor tree to hang.
> Siri,
> Thanks for your feedback. You can re-fetch the branches:
> git fetch git://github.com/capflam/otp.git simple_one_for_one_shutdown
> git fetch git://github.com/capflam/otp.git supervisor_shutdown_infinity
> Let me know if there is any problem with my updates (Especially with the
> documentation).
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Refetched supervisor_shutdown_infinity

Included simple_one_for_one_shutdown in 'pu'

Thank you

/Henrik Nord Erlang/OTP

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