Loadbalancing with failover but remembering the unavailable endpoint

[bob_sheknowdas <bo...@googlemail.com>]

Hi,

I implemented a load balancer using camel and its failover and round robin
features.
Everythink works perfectly well.

But now Im trying to improve my load balancer in a way, that it keeps track
of the unavailable endpoints.

Currently, my balancing routine looks like this:
     *from("startpoint").loadBalance().failover(3, false,
true).to("endpoint1", "endpoint2");*

Now, the problem is, that if one of the endpoints becomes unavailable, the
routine doesnt become aware of that and keeps trying to contact the every
endpoint. With a maximumFailoverAttempt of 3 this means, that every second
request becomes very slow.

Is there a way to make camel remember the unavailable endpoint.
It would be perfect, if camel could assaign a timeout to an unavailable
endpoint and not contact that one any longer, until the timeout has passed.

I've read, that the circuit breaker load balancer offers such a feature.
But I dont know how to combine that with my already pretty well working
failover load balancer.

Can you guys help me?



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Re: Loadbalancing with failover but remembering the unavailable endpoint

[Claus Ibsen <cl...@gmail.com>]

Hi

No not with those OOTB load balancers from camel-core. They are a bit limited.
You can build your custom load balancer, and extend some of the OOTBs
or copy their code.

If you want to use hystrix circuit breaker, then it has such a
functionality but for calling one service. But you can use it for
failing over via network to service 2 - if you have a limited number
of services.

See the hystrix docs and examples.
http://camel.apache.org/hystrix-eip.html

Another options is the service call eip which can lookup services per
request and then select among the live services.
http://camel.apache.org/servicecall-eip.html



On Sat, Jan 28, 2017 at 5:20 PM, bob_sheknowdas <bo...@googlemail.com> wrote:
> Hi,
>
> I implemented a load balancer using camel and its failover and round robin
> features.
> Everythink works perfectly well.
>
> But now Im trying to improve my load balancer in a way, that it keeps track
> of the unavailable endpoints.
>
> Currently, my balancing routine looks like this:
>      *from("startpoint").loadBalance().failover(3, false,
> true).to("endpoint1", "endpoint2");*
>
> Now, the problem is, that if one of the endpoints becomes unavailable, the
> routine doesnt become aware of that and keeps trying to contact the every
> endpoint. With a maximumFailoverAttempt of 3 this means, that every second
> request becomes very slow.
>
> Is there a way to make camel remember the unavailable endpoint.
> It would be perfect, if camel could assaign a timeout to an unavailable
> endpoint and not contact that one any longer, until the timeout has passed.
>
> I've read, that the circuit breaker load balancer offers such a feature.
> But I dont know how to combine that with my already pretty well working
> failover load balancer.
>
> Can you guys help me?
>
>
>
> --
> View this message in context: http://camel.465427.n5.nabble.com/Loadbalancing-with-failover-but-remembering-the-unavailable-endpoint-tp5793144.html
> Sent from the Camel - Users mailing list archive at Nabble.com.



-- 
Claus Ibsen
-----------------
http://davsclaus.com @davsclaus
Camel in Action 2: https://www.manning.com/ibsen2