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From "Matteo Pavesi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CAMEL-7973) CircuitBreakerLoadBalancer fails on async processors
Date Thu, 30 Oct 2014 10:52:34 GMT

    [ https://issues.apache.org/jira/browse/CAMEL-7973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14189924#comment-14189924
] 

Matteo Pavesi commented on CAMEL-7973:
--------------------------------------

Thanks for the interest in this issue and for the quick change. I've also learned something
from the fix to my patch :)


> CircuitBreakerLoadBalancer fails on async processors
> ----------------------------------------------------
>
>                 Key: CAMEL-7973
>                 URL: https://issues.apache.org/jira/browse/CAMEL-7973
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-core
>    Affects Versions: 2.14.0
>            Reporter: Matteo Pavesi
>            Assignee: Willem Jiang
>            Priority: Minor
>             Fix For: 2.14.1, 2.15.0
>
>         Attachments: 0001-CAMEL-7973-added-failing-test-for-circuit-breaker-wi.patch,
0002-CAMEL-7973-fix-circuit-breaker-with-async-processors.patch
>
>
> The CircuitBreakerLoadBalancer works fine on direct synchronous processor, but it seems
to not behave as expected in case of async processor.
> To reproduce the error, it's enough to add a .threads(1) before the mock processor in
the CircuitBreakerLoadBalancerTest routeBuilder configuration.
> This misbehaviour seems to be related to the use of the AsyncProcessorConverterHelper
to force any processor to behave like asynchronous. 
> I'm going to propose a patch with the failing test and a proposal of solution.
> EDIT:
> the patch contains the fix also to other unexpected behaviour of the CircuitBreaker.
> The second problem addressed is that, after the opening of the circuit, the RejectedExecutionException
raised by the circuit breaker is set in the Exchange, but it doesn't return. This cause the
processor will receive the Exchange even if the circuit is open. In this case also, if the
CircuitBreaker is instructed to react only to specific Exception, it will close the circuit
after the following request, because the raised exception would be a RejectedExecutionException
instead of the one specified in the configuration.



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