[erlang-questions] Erlang in Amazon AWS cloud

Daniel Dormont <>
Thu Nov 3 18:30:14 CET 2011


One issue I've run into is that at least with the setup my company is using
now, any time we restart an instance it gets a different host name, which
means the Erlang node name changes, which means the existing Mnesia tables
are no good. I'm not familiar enough with AWS to know if there's something
different to be done.

dan

On Thu, Nov 3, 2011 at 11:42 AM, dokondr <> wrote:

> Torben, thanks for detailed answer!
>
> On Thu, Nov 3, 2011 at 11:37 AM, Torben Hoffmann <>wrote:
> ...
>
>> Mnesia in AWS is not a bit problem, but you have to deal with the fact
>> that your instance can disappear and everything is lost, so you need do a
>> bit of thinking about how to deal with that. I bet some of the Mnesia gurus
>> can help you with some pointers there.
>>
>
> This should be a general problem, not just Mnesia. What is Amazon idea
> what user should do with his data stored in DBMS, e.x. MySql,  when
> instance disappear?
>
> Have  anybody tried to run Erlang ETS / DETS key-value storage on Amazon
> AWS? How  to scale ETSDETS to several instances in this case?
>
>>  2) My app today consists of several standalone processes that
>> communicate by means of simple files. I move from files to key-value store,
>> but would like to preserve independent processes communicating with each
>> other. What is a natural Erlang way to do this? How this natural way will
>> be able to scale in AWS?
>>
>> Erlang is all about message passing directly between processes - forget
>> about the files. It scales extremely well in AWS. Disclaimer: we have not
>> tried to do inter-machine communication with our newest architecture, but I
>> doubt it will be much of an issue.
>>
>
> Will I need some external Message Queue product (such as RabbitMQ) for two
> Erlang machines to communicate? I know about general mechanism of message
> passing between Erlang processes in the same or several machines. But what
> about "store-and-forward" mechanism between machines, is it supported? As I
> understand, I myself will have to implement persistent store to save
> messages between instance restarts, Erlang OTP does not have this "out of
> the box", correct?
>
> Thanks,
> Dmitri
>
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