24 Nov
2005
24 Nov
'05
8:30 p.m.
On 11/24/05 20:52, Douglas Garstang wrote:
I'm trying to understand a little better the docs
for the algorithms in the dispatcher module.
What exactly does 'hash over call-id', or 'hash over from uri' mean? The
emphasis here is on the use of the word 'hash'.
the hash is an integer
number computed from a value, based on different
algorithm. For same value, the hash is the same. In this case a modulo
to number of destinations is applied to get the entry in the destination
set. An example of an hashing algorithm for string values is to add the
ASCII codes of the characters in the string. In openser it is used a
more complex hashing.
For a given call-id or a given from uri, I think I
understand that the selected proxy will always be the same. However, is there any way to
determine how this will distribute call volume between proxies?
You can do some
statistics based on the traffic you have on your
platform. Watch the dispatching by writing log messages and after
several days see the results.
Is there some magic formula that is used (ie the
hash) to select the proxy? I'd like to know what it is so I could run some numbers
through it and try and understand how it would break up call placement to proxies for
certain input values.
For same value, the hash result is the same. Try with hash over From uri
and make several calls.
Cheers,
Daniel
Doug.
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