Configuration setting for "Rolling Window" for Circuit Breaker

[Dave Leo]

I am new to Hystrix and feel like the documentation is better than alot of open source libraries.

Either I am misunderstanding something or I the documentation doesn't explain the Default value or conifgurable setting for  the Circuit Breaker's "rolling window" length of time.

Both circuitBreaker.requestVolumeThreshold and circuitBreaker.errorThresholdPercentage seem to be based on a "rolling window" timeframe but I haven't been able to track down what it is and how to modify it.

Am I misreading this? Or missing something?

Please help,

--Dave Leo

[Ben Christensen]

Hi Dave, 

A circuit breaker has a “sleep window” which is documented here: https://github.com/Netflix/Hystrix/wiki/Configuration#circuitbreakersleepwindowinmilliseconds

The metrics window is here: https://github.com/Netflix/Hystrix/wiki/Configuration#metricsrollingstatstimeinmilliseconds and here https://github.com/Netflix/Hystrix/wiki/Configuration#metricsrollingpercentiletimeinmilliseconds for the different rolling windows.

-- 
Ben Christensen - Netflix Edge Engineering
+1.310.782.5511  @benjchristensen

--
You received this message because you are subscribed to the Google Groups "HystrixOSS" group.
To unsubscribe from this group and stop receiving emails from it, send an email to hystrixoss+...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Dave Leo]

Thanks.  I eventually found in some javadoc that said that the rolling window that the circuit breaker uses is the metrics one.  Maybe a tweak to the documentation to mention that would be helpful for future newbies.

Thanks for the response,

-Dave

[Johan Haleby]

I'm also a bit confused by this. Did you find out exactly which property that is used and did you verify that it worked? I'm looking into the source code but I cannot seem to find that the metrics window should affect the circuit breakers in this sense.

Regards,

/Johan

[David Leo]

It uses: hystrix.command.default.metrics.rollingStats.timeInMilliseconds

I did verify this with some tests.  Docs talk about this value used for stats but it also used by Circuit Breaker.

Hope that answers your question,

Dave