Setting Hystrix timeout with environment variable - spring-cloud

Question

In order to change Hystrix's default request timeout (1000ms), one must set the following property :
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=2000
What is the corresponding environment variable ?
I would like to "tune" the timeout on my favorite cloud platform without touching the source code first.
I'm pretty sure this one doesn't work : HYSTRIX_COMMAND_DEFAULT_EXECUTION_ISOLATION_THREAD_TIMEOUT_IN_MILLISECONDS=2000
EDIT : Problem was found with Spring Cloud Camden / Spring Boot 1.4.

Answer 1

VM options and environment variables can be referenced from application configuration, which is often a more convenient way to set properties with longer names.
For example, one can define the following reference in application.yml:
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds: ${service.timeout}
which will be resolved from the VM option -Dservice.timeout=10000, setting the default Hystrix command timeout to 10 seconds. It is even simpler with environment variables - thanks to relaxed binding, any of these will work (export examples are for Linux):
export service.timeout=10000
export service_timeout=10000
export SERVICE.TIMEOUT=10000
export SERVICE_TIMEOUT=10000
The common approach is to use lowercase.dot.separated for VM arguments and ALL_CAPS_WITH_UNDERSCORES for environment variables.

Answer 2

You could try expression with a default value:
hystrix.command.default.execution.isolation.thread.timeoutIn‌Milliseconds: ${SERVICE_TIMEOUT:2000}
In case you have SERVICE_TIMEOUTsystem variable - it will be used by an application, otherwise, a default value will be picked up.

Answer 3

Found more of a workaround than a solution, using SPRING_APPLICATION_JSON environment variable :
SPRING_APPLICATION_JSON='{ "hystrix" : { "command" : { "default" : { "execution" : { "isolation" : { "thread" : { "timeoutInMilliseconds" : 3000 } } } } } } }'

Answer 4

You can use Spring config yaml file , Please read further on following link
https://github.com/spring-cloud/spring-cloud-netflix/issues/321

Answer 5

VM option -Dhystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=2000 works for me. However it has a side effect, then you can not change the config value in java code since system properties are prioritized.
ConfigurationManager.getConfigInstance().setProperty(
"hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds", 3000);// it doesn't work