[rules-users] Drools HA

[gboro54]

Messages may or may not update the same context depending on the message. In
this case we are generating charges for accounts. When the total sum of
charges hit a certain threshold for a given account a new rate needs to be
given. So in the example message 1 and message 2 are for account 123.
Message 1 is picked up by node 1 and message 2 by node 2 from the queue.
During evaluation of message 1 it is determined that the threshold is
reached and all messages going forward are charged differently(i.e a rule
checks the context plus the new charge to determine this). Therefor message
2 should be charged less. If both message 1 and 2 where in the same rules
session and update is called on the context object the rule tree would be
reevaluated and a new charge could be generated for message 2. In this case
they are running on separate nodes and I am not sure who drools stateful
sessions replicate if at all...



salaboy wrote
> 
> So, you are interchanging messages between the nodes to notify the
> updates that needs to be executed?
> Message 1 and Message 2 are related? Can they be evaluated in
> parallel? or they require to have the same context?
> Cheers
> 
> On Thu, Dec 29, 2011 at 4:25 PM, gboro54 <gboro54@> wrote:
>> Hi everyone. We are currently evaluating drools as a potential solution
>> of a
>> high throughput billing system. As is such we are planning to have
>> messages
>> read from a queue from 2 or more nodes. One thing we are trying to figure
>> out is best way to share state in drools. The situation we are facing is
>> as
>> follow:
>>
>> -Node 1 reads message 1
>> -Node 2 reads message 2
>> -Node1 begins execution of rules on message 1 with context information
>> -Node2 begins execution of rules on message 2 with context information
>> -Node 1 updates the context information such that rules being executed by
>> node2 should be reevaluated(i.e node 1 in the rules session executed an
>> update on the context object)
>>
>>
>> What is the best way to handle this situation?
>>
>> Thanks
>>
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> 
> 
> 
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> 
>  - Salatino "Salaboy" Mauricio -
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