HystrixRuntimeException intermittently

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Ashish Kumar Alugaddala

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Jun 26, 2020, 10:22:11 AM6/26/20
to HystrixOSS

Dear Team,


I am getting HystrixRuntimeException intermittently in my service when calling downstream service using spring rest template. Same downstream service is called from other services as well but not seeing any error. Not getting any timeout errors before short circuit. 


DownStreamService: 

      execution: 

        isolation: 

          thread: 

            timeoutInMilliseconds: 3000 


DownStreamServiceThreadPoolKey: 

      coreSize: 100 

      maximumSize: 100 

      maxQueueSize: 5


Code: 

@HystrixCommand(commandKey = "DownStreamService", fallbackMethod = "downStreamApIResponse FallBackMethodForHystrixFailure", threadPoolKey = "DownStreamServiceThreadPoolKey")

public Observable<DownStreamApIResponse> getAPIResponse(HttpHeaders headers) {


return ResponseEntity< DownStreamApIResponse > responseEntity = restTemplate.exchange(

url, HttpMethod.GET, requestEntity, DownStreamApIResponse.class);

}



public DownStreamApIResponse downStreamApIResponse FallBackMethodForHystrixFailure(HttpHeaders headers,

Throwable hystrixCommandExp) throws TimeoutException {

if (hystrixCommandExp.getCause() instanceof HttpStatusCodeException) {

HttpStatusCodeException httpStatusCodeExp = (HttpStatusCodeException) hystrixCommandExp.getCause();

LOG.error("HttpStatusCodeException: " + httpStatusCodeExp.getMessage());

throw httpStatusCodeExp;

} else if (hystrixCommandExp instanceof HystrixTimeoutException) {

LOG.error("HystrixTimeoutException: " + hystrixCommandExp.getMessage());

throw new TimeoutException();

}

        return new DownStreamApIResponse(status:"error");

}



Please let me know some ways to overcome this. Transactions per second of my API is more than 20 and 2 app instances running on cloud. 

Ashish Kumar Alugaddala

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Jun 26, 2020, 10:33:00 AM6/26/20
to HystrixOSS

This is my fallback.


public DownStreamApIResponse downStreamApIResponse FallBackMethodForHystrixFailure(HttpHeaders headers,

Throwable hystrixCommandExp) throws TimeoutException {

if (hystrixCommandExp.getCause() instanceof HttpStatusCodeException) {

HttpStatusCodeException httpStatusCodeExp = (HttpStatusCodeException) hystrixCommandExp.getCause();

LOG.error": HttpStatusCodeException: " + httpStatusCodeExp.getMessage());

throw httpStatusCodeExp;

} else if (hystrixCommandExp instanceof HystrixTimeoutException) {

LOG.error(": HystrixTimeoutException: " + hystrixCommandExp.getMessage());

throw new TimeoutException();

}

        throw new RuntimeException("Failure occurred while making rest call"); 

}


Error:


com.netflix.hystrix.exception.HystrixRuntimeException: DownStreamService short-circuited and fallback failed


java.lang.RuntimeException: Hystrix circuit short-circuited and is OPEN

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