[OpenSIPS-Users] [NEW] Load-balancing module + usage tutorial

[Bogdan-Andrei Iancu]

Hi Matteo,

There is no need for a specific mechanism to do failover. It is not like 
in other cases where you build a list of destinations and try them in 
order. With LB, you cannot build an ordered set of destinations, because 
the order relation depends on load and load is continuously changing.

So, if a destination fail, in failure route you simple do again 
load_balance() to get the new less loaded destination and re-try.

Regards,
Bogdan

mmarzuola at interfree.it wrote:
> Hi Bogdan.
> I have a question about the features of the new load-balancer module.
> If the better selected destination is unreachable, the module provides a failover by selecting the second best destination?
>
> Thanks in advance.
>
> Matteo Marzuola
>
> 		
>
>
>
>
>   
>> Hi,
>>     
>
>   
>> Before the SVN freeze for 1.5, as per TODO list, I uploaded a 
>>     
> load-balancing module. I kept quite until now as I wanted to prepare >a good description and documentation about it.
>
>
>   
>> The Load-Balancer module comes to provide traffic routing based on load. 
>> Shortly, when OpenSIPS routes calls to a set of destinations, it is able 
>> to keep the load status (as number of ongoing calls) of each destination 
>> and to choose to route to the less loaded destination (at that moment). 
>> OpenSIPS is aware of the capacity of each destination - it is 
>>     
> preconfigured with the maximum load accepted by the destinations. To be 
>   
>> more precise, when routing, OpenSIPS will consider the less loaded 
>>     
> destination not the destination with the smallest number of ongoing 
> calls, but the destination with the largest available slot.
>
> The "load-balancing" functionality comes to enhance the "dispatcher" 
> one. The difference comes in having or not load information about the 
> destinations where you are routing to.
>
> For more info, please refer to the tutorial I just uploaded on the web site:
>  http://www.opensips.org/index.php?n=Resources.DocsTutLoadbalancing
>
> Best regards,
> Bogdan
>
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