Mnesia fragmentation

martin logan <>
Fri Aug 16 02:06:28 CEST 2002


Hello All,

I would like to preface this by saying that this question is not about 
telephony, so all those who read the first sentence and turn away, please 
keep reading.

I have a call detail record collection system for a sip platform that needs 
to be monitored. The system has a non fixed collection of nodes that exist 
as state servers for all calls existing on the platform. I must be able to 
accuratly monitor calls on these servers. This task is complicated by the 
fact that servers are going to be hosting thousands of calls at any given 
time. The high volume of data and the high write to read ratio militates 
against efficiant standard mnesia replication. I need to come up with a 
system wherein I can veiw all of the servers as a single resource 
independent of the location of the various server instances. I was thinking 
that fragmentation would be the solution. Ideally each server would write 
all of its data to its local fragment but when queries are performed the 
table is treated as a whole. Perhaps I have missunderstood the purpose of 
fragmentation. It seems to me that without control over the fragments that I 
could incur a network hit on every write. This is obviously preferable to a 
full mesh of fully replicated mnesia nodes but still not adiquate for my 
system. If anyone out there has experiance with this type of problem please 
let me in on your solution.

Thanks alot,
Martin


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