[erlang-questions] can nodes fail/recover too fast to be seen?

Per Hedeland <>
Fri Jul 5 23:44:39 CEST 2013


Jonathan Leivent <> wrote:
>
>On 07/05/2013 04:31 PM, Per Hedeland wrote:
>> Jonathan Leivent <> wrote:
>>>
>>> OK - so it is TCP that saves the day.  I'm not sure I want to be that
>>> dependent on TCP, though.
>>
>> I'm not sure how to interpret that statement. If you mean
>>
>> - "I want to be able to use something other than TCP" - fine, as long as
>> it provides the same guarantees, and you can figure out how to hook it
>> into the Erlang distribution.
>
>I might want to use UDP in the future.  Or, something that is just 
>slightly more than UDP - such as providing traffic control, but not 
>reliability. My app is supposed to be able to handle 
>lost/duplicate/unordered messages on is own - so much of what TCP 
>provides is redundant.

So use UDP to send Erlang terms as binaries over plain sockets, gen_udp
is a fine module. But don't try to implement Erlang distribution on top
of UDP - some number of years from now you will at best have
re-implemented TCP with characteristics that are significantly inferior
to the real thing. Or you may have something that *isn't* Erlang
distribution.

--Per



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