Netflix/Hystrix

Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable.

Alessandro Vermeulen

@spockz

@Saptarsi-C is is straightforward to convert a Single into a completable future. Single to c.twitter.util.Future

jonefee wang

@jonefeewang

Hello folks, I am encountering HystrixObservableCommand thread pool rejection problem, my Command extends HystrixObservableCommand, as I know HystrixObservableCommand dosen't has concurrency threshold or etc. Anybody know why this happends ?

jonefee wang

@jonefeewang

got the answer:

                // default to using SEMAPHORE for ObservableCommand if the user didn't set it
                commandPropertiesDefaults.withExecutionIsolationStrategy(ExecutionIsolationStrategy.SEMAPHORE);

Saptarsi-C

@Saptarsi-C

Hi I am getting timeout exceptions randomly . I am using consul, with feign. Underlying service in returning response within the fallback time. Moreover the readTimeout , connection timeout of OkHttpClient of feign has a larger time than the hystrix timeout. Can anyone suggest?

Roberto Perez Alcolea

@rpalcolea

anyone has issues with HystrixObservableCommand and RxJava zip? We are seeing our hystrixcommand keeping/creating semaphores and not killing them. No failures in the Observable

Khurrum Nasim

@knasim

Hello

is there a room for Curator ?

I had a question on curator - how do i ensure that my cache stays alive in my application ?

majidvodworks

@majidvodworks

Hi All,
I'm trying to use use spring cloud hystrix with spring cachable annotation, it is not working.
following is code sample

```
@Cacheable(value = "test", sync = true)
@HystrixCommand(fallbackMethod="recoverGetValue")
public String getValue(int id) {
    return id + "";
}

public String recoverGetValue(int id) {
    System.out.println("getting data from different resource");
    return id + "";
}

```

Cacheable annotation throws operationTimeoutException, but fallback method is not being called. How to solve this issue?

Srepfler Srdan

@schrepfler

anyone know what are the Zuul guys doing these days? there was some buzz when they explored zuul 2.0 and wrote the article with the conclusions but there was no conclusion/release afterwards, as if it all died

snakeyes30

@snakeyes30

can someone please point towards some documentation about publishing a hystrix.stream to a turbine server without using discovery?

Jagmohan Sharma

@JagmohanSharma

Hi Netflix/Hystrix Team,
I am facing issue with hystrix turbine dashboard as The request rates shown at the aggregated circuit level do not match the threadpool request rates.These should be the same or very close. Please let me know if this not expected behaviour?

Screen Shot 2017-10-13 at 3.46.03 PM.png

As shown in above screenshot- request rate at aggregated circuit level is not matching with request rate at thread pool level. As cluster rate at circuit level is 135/s and thread pool level is 1622.1/

I made some changes in hystrixThreadpool.js by taking previous changes in hystrixCommand.js into consideration. Please have look on this if It is on right side. :)

Netflix/Hystrix#1697

Thiago Santos Joaquim

@thiago-santos

Hi guys!!! Everyone ok? Sorry any mistake in my english...

So, does anyone know how I can expose a random port on dokcer to Eureka?

Thiago Santos Joaquim

@thiago-santos

Hi everyone. What is the write way? i have 5 microservices and zull, hava any way to implement hystrix over zuul to protect all services or i have to implement hystrix in any microservice? in your opinion?

Ronen

@ronenhamias

Hello guys wanted to ask you what do you think about SWIM and gossip protocol for microservices faliure detection and cluster membership for example:
https://github.com/scalecube/scalecube

Sushant Borse

@sushant91265_twitter

hey, has anyone integrated hystrix metrics to prometheus ?

David J. M. Karlsen

@davidkarlsen

@sushant91265_twitter https://github.com/ahus1/prometheus-hystrix

Sushant Borse

@sushant91265_twitter

Thanks @davidkarlsen , but unfortunately that one is not working for me...any other suggestion?

David J. M. Karlsen

@davidkarlsen

how is it not working?

Sushant Borse

@sushant91265_twitter

looks like the metrics I'm getting after hitting http://localhost:8888/metrics are spring-actuator-metrics(http://jsoneditoronline.org/?id=26dbc05242d6f12bba63df3f31ece107) and it is not in the prometheus required format and that is why getting error as "text format parsing error..."

Shivam Goel

@shivamgoel

When will be zuul/2 available ?

Hoswey

@hoswey

Hi, I want to implement the Hystrix in gateway(like zuul).
The gateway will discover service A, B or C, assume the service A has 10 instances and 10 Api. My question is.
What is the best practice for the command key decision? Service Name+Instance IP+Api Name, it seems this gain the best detail level, as the different api, different instance fail will not circle break the other, But it may occupy large volume of command key.

Jagmohan Sharma

@JagmohanSharma

Hi Hystrix team, Can somebody from hystrix team or other help me on Netflix/Hystrix#1525 issue. I was in dicussion with @mattrjacobs in this. Can someone look into this? any help would be appreciated. Thanks.

Yang Lifan

@yanglifan

In Hystrix 1.6.0, HystrixObservableCommand might remove thread-isolation. Netflix/Hystrix#1200 @jonefeewang

FDebiesse

@FDebiesse

Hello. I'm using Hystrix and its circuit breaker. It seems that HTTP 404 error is considered as an error so the circuit gets opened (trapped) after multiple 404 errors. How can I tell Hystrix to consider 404 responses as a success ? (to deal with Restful architecture)

Yang Lifan

@yanglifan

Why Hystrix fallback not controlled by timeout?

Mr.CrazyIT

@dicheng52119

Is neccessary to save the Hystrix monitoring log information to the database?

I really want to know there is no need, because my project needs to use it, which God can help me?

pbagchi

@pbagchi

Hi, I am working on a project using Hystrix and gRPC. I have a HystrixObservableCommand class - MemberCommand and I am subscribing using Schedulers.io()

memberCommand.toObservable().subscribeOn(Schedulers.io());

In the construct method, I log the gRPC context but it returns null -

protected Observable<Greeter.GreeterReply> construct() {
 logger.info("0 -- In MemberCommand, traceId from gRPC context = {}", ContextKeys.TRACE_ID_CTX_KEY.get());

Any ideas, how I can propagate gRPC context through RxIoScheduler threads?
For the above I get,

0 -- In MemberCommand, traceId from gRPC context = null

Eric Turley

@ericjturley

I could really use a look at this question regarding testing the hystrix fallback behavior in a Feign client:
https://stackoverflow.com/questions/48815080/testing-hystrix-fallback-through-feign-api-com-netflix-client-clientexception

I'm new to this, so I'm probably just missing something simple.

Ahmed BOUCETTA

@ahmed-boucetta

hello can i use failsafe with hystrix Dashboard ?

Charlotte Williams

@charsfamily1106

Shane Witbeck

@digitalsanctum

hi, can anyone from Netflix comment on when Sonar will be open sourced?

pankajrepo

@pankajrepo

Hi I want to use zuul for api gateway. I am using spring boot 2.0 and <dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zuul</artifactId>
<version>1.2.3.RELEASE</version>
</dependency>

getting below exception [INFO] --- spring-boot-maven-plugin:2.0.0.RELEASE:start (pre-integration-test) @ api-gateway ---
[WARNING]
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run (AbstractRunMojo.java:496)
at java.lang.Thread.run (Thread.java:748)
Caused by: java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder.<init>([Ljava/lang/Object;)V
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext (BootstrapApplicationListener.java:120)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent (BootstrapApplicationListener.java:84)
at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent (BootstrapApplicationListener.java:62)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener (SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener (SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent (SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent (SimpleApplicationEventMulticaster.java:127)
at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared (EventPublishingRunListener.java:74)
at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared (SpringApplicationRunListeners.java:54)
at org.springframework.boot.SpringApplication.prepareEnvironment (SpringApplication.java:351)
at org.springframework.boot.SpringApplication.run (SpringApplication.java:317)
at org.springframework.boot.SpringApplication.run (SpringApplication.java:1246)
at org.springframework.boot.SpringApplication.run (SpringApplication.java:1234)
at com.noonwallet.api.gateway.service.ApiGatewayServiceLauncher.main (ApiGatewayServiceLauncher.java:12)
at sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:498)
at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run (AbstractRunMojo.java:496)
at java.lang.Thread.run (Thread.java:748)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

while starting the application

anyone have any idea, what am i missing here?

itshan

@MadeInChina

Is anyone here who can check Netflix/ribbon#377

Srini555

@Srini555

Netflix hystrix can support to Soap WS

wuheng3803

@wuheng3803

java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6882d8d8: startup date [Tue Jul 17 16:03:25 CST 2018]; parent: org.springframework.context.annotation.AnnotationConfigApplicationContext@25139613
at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414)
at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97)
at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523)
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968)
at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
at com.tienon.TurbineApplication.main(TurbineApplication.java:16)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)

2018-07-17 16:03:25.617 ERROR [spring-cloud-hyxtrix-turbine,,,] 9844 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class [com.tienon.TurbineApplication]; nested exception is java.lang.IllegalStateException: Failed to introspect annotated methods on class org.springframework.cloud.netflix.turbine.stream.TurbineStreamConfiguration
at org.springframework.context.annotation.ConfigurationClassParser.processImports(ConfigurationClassParser.java:616)
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:299)
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:198)
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308)
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationC

benyVip

@benyVip

The Error Message so long

Ghost

@ghost~5b08154ed73408ce4f9ab57b

How can I reset Only eventNotifier, instead of Hystrix.reset(), because it is resetting my micrometer publisher too

Mate Lang

@matelang

Hello. Can somebody please take a look at a long pending pull request for a non-intrusive, yet important (for us at least) feature at the following PR:
Netflix/Hystrix#1809

vinishasharma

@vinishasharma

Hey!! I have wrapped my commands to access datastax under hystix. When I disconnect myself from internet, I sometimes get NoHostAvailable(Wrapped under HystrixRuntimeException) and sometimes I get HystrixTimeout with all the other configurations, even the withExecutionTimeoutInMilliseconds remaining same for both cases.
Can anyone let me know, why i am getting these two different types of exceptions?

Kevin

@kevinludwig

is there a mechanism to load hystrix configuration from a properties file (or application.yml in a boot app)? In particular I'm using the javanica contrib library.

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