[rules-users] Drools HA

[Mauricio Salatino]

+1 to Wolfwang solution
The other alternative is to share information between the two nodes
using an extra master node that keeps a global status (high-level
information) to know when to update each of the low-level nodes that
handle more specific information.

On Fri, Dec 30, 2011 at 5:09 AM, Wolfgang Laun <wolfgang.laun at gmail.com> wrote:
> The standard proposal for this kind of problem is to route messages
> to processing nodes according to some account key function, e.g. mod 2.
> Thus, all state handling for one account is done in one node.
> -W
>
> On 29/12/2011, gboro54 <gboro54 at gmail.com> wrote:
>> 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 &lt;gboro54@&gt; 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
>>>>
>>>> --
>>>> View this message in context:
>>>> http://drools.46999.n3.nabble.com/Drools-HA-tp3619496p3619496.html
>>>> Sent from the Drools: User forum mailing list archive at Nabble.com.
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>>>
>>>
>>>
>>> --
>>>  - CTO @ http://www.plugtree.com
>>>  - MyJourney @ http://salaboy.wordpress.com
>>>  - Co-Founder @ http://www.jugargentina.org
>>>  - Co-Founder @ http://www.jbug.com.ar
>>>
>>>  - Salatino "Salaboy" Mauricio -
>>>
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>>>
>>
>>
>> --
>> View this message in context:
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>> Sent from the Drools: User forum mailing list archive at Nabble.com.
>>
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-- 
 - CTO @ http://www.plugtree.com
 - MyJourney @ http://salaboy.wordpress.com
 - Co-Founder @ http://www.jugargentina.org
 - Co-Founder @ http://www.jbug.com.ar

 - Salatino "Salaboy" Mauricio -