[zeromq-dev] 0MQ to the rescue

gonzalo diethelm gdiethelm at dcv.cl
Tue Aug 10 14:17:38 CEST 2010

> COBOL on AIX... <eyes glaze over, PTSD kicks in>...


Oops. Sorry about that; I am stuck with this POS.


> Gonzalo, sounds like a very interesting project.  You'll have seen the

> discussion on reliability at

> http://www.zeromq.org/blog:requirements-for-reliability?


Yes, and I am thinking pretty much along those lines. I have even

of using SQLite as a temporary message store. My first concern is not to

bog Sybase down with the XSP; I don't think it should impose much of a

load on the server (but I will benchmark the thing). Then, I don't want

those messages to ever get lost, even if I must store them to disk

after being shipped out, at which point I am not as concerned with

performance as on the XSP.


> Regarding the design, you'll probably get more feedback from the list

> if you can provide a diagram showing the pieces and how they connect.


Ok, I don't have the wonderful tools you guys use to create drawings,

But here is a feeble attempt; if this doesn't show up on the list, I

can provide URLs.




The COBOL programs issue insert, update and delete statements to Sybase;

the XSP gets called for each of them, and ships that information out to

my external Data Analysis program, which will make sure to logically

replicate the changes done in Sybase onto my new, "next generation"

system (and DB).


Alternatively, I could go for this:




Basically the same idea, but I use a streamer in there if the load

justifies it.


Notice that this is a change from my initial design: the XSP always

connects. In the first case, the Data Analysis binds; in the second

case, they both connect to the streamer.


Thanks for any further feedback.



Gonzalo Diethelm


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