The hystrix version in my application is 1.5.12.@Hystrix. The command is used like this:
@HystrixCommand(groupKey = "myGroupKey", commandKey = "myCommandKey", fallbackMethod = "myFallBack").
The value of hystrix.command.default.execution.timeout.enabled is false in the config file, which means that the hystrix timeout is forbidden, but the HystrixTimeoutException is thrown by a thread named HystrixTimer-2.