Hotswap

[Peter-Henry Mander]

I couldn't let this pass me by without complementing the guys who wrote 
the MeGaCo stack. I use Erlang/MeGaCo to test for interop with 3rd party 
stacks and the in-house C/C++ implementation. We performed an acceptance 
test using it, and pinpointed about a dozen issues with the software we 
commisioned from XXX (no names given, but they are stack specialists). 
We couldn't do acceptance against our actual product because the C/C++ 
MeGaCo stack was nowhere near ready. No comment!

I think we embarassed the guy who came over to aid the integration! And 
our own MeGaCo team! The current Erlang version of the MeGaCo stack is a 
very solid product, it's value is priceless. I can vouch for it.

Pete.


Ulf Wiger wrote:
> On Thu, 3 Apr 2003, Vance Shipley wrote:
> 
> 
>>Hot swap is useful for more than constant uptime production
>>systems.  When you are doing development on a system
>>involving more than a few modules/processes the startup
>>time can be significant.  Just starting an erlang node
>>takes a while.  I generally edit code in one window and
>>then in another I am running an erlang shell on the system
>>under test in which I run c(module) which compiles and
>>loads the new module.  You then test, edit, test, etc.
>>This iteration is really fast compared to a cold boot of
>>the erlang node and starting the processes.
> 
> 
> Oh, and this feature is a jaw dropper at Interops. I've
> heard several accounts where people have brought
> erlang-based systems to interops (Megaco, MPLS, etc.), and
> have debugged and fixed interoperability problems in minutes
> without restarting the system -- sometimes without even
> dropping the session!
> 
> I also seem to recall occasions where the erlang guys have
> helped their competitors debugging _their_ system simply by
> being able to follow the communication so much better on the
> erlang side. Finally, I've heard accounts of the erlang guys
> implementing workarounds to other people's bugs simply
> because it was so much easier to do it that way than to wait
> for them to get a fix from their design teams.
> 
> /Uffe