new to erlang: need ideas for server software
Joe Armstrong (TN/EAB)
Thu Aug 17 09:35:44 CEST 2006
Interesting - can somebody answer the following:
cometd looks to be a ideal application for Erlang. I have written this
try of application *many times*
I have implemented a similar thing (many times). With the following
- instead of using JSON encoded message bodies I can send an
message with an arbitrary encoding, determined by the mime-type
of the message.
In fact I use binary encoded Erlang terms (using
When I compared this with XML encoded terms, my version ran 16 times
- the set of messages
- I use what I call "poly ports", poly ports understand
so even though I use port 80 and HTTP I can interleave non-http messages
on the port 80 channel (A kind of short form of the HTTP) instead of
sending GET .... or POST ... I just send "eBin...." meaning "here comes
an Erlang term encoded with term_to_binary. When I decode this term I
the parse tree of the HTTP GET/POST etc. request, again much faster
Now I have some questions about cometd.
- Is this an "interesting" application - ie if implemented in an
efficient manner will
anybody be interested and use the implementation?
- Just how high performance is desirable?
How many message/sec should a single server handle?
How many simultaneously open connections should a single server
How frozen is the protocol?
A really large server would benefit from an addition message in the
* redirect (client - server message)
* hand-over (server - server message)
redirect can move a connection to a new server, the server send
redirect to the client
with a new server IP. The client closes the connection and connects to
the new server.
hand-over is used between server to negotiate a redirection before it
This can be used for:
- load balancing (a busy server can redirect connections to a
- taking a server out of service, without interrupting the service
- scaling the capacity of the server.
> -----Original Message-----
> [mailto:] On Behalf Of Roberto Saccon
> Sent: den 17 augusti 2006 04:32
> Subject: Re: new to erlang: need ideas for server software
> oh, this is exactly what I am working on right now.
> > A cometd implementation:
> > http://cometd.com/
> Roberto Saccon
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