по умолчанию Zuul использует стратегию изоляции семафора, которая не позволяет установить тайм-аут. Я не могу использовать балансировку нагрузки с этим стратегия. Что сработало для меня (следуя вашему примеру):

1) Изменение изоляции Zuul в поток:

hystrix:
  command:
    reservation-service:
      execution:
        isolation:
          strategy: THREAD
          thread:
            timeoutInMilliseconds: 100000

важно: timeoutInMilliseconds= 100000-это как сказать, что нет HystrixTimeout. Почему? Потому что, если Hystrix times out не будет балансировки нагрузки (я только что протестировал его, играя с timeoutInMilliseconds)

затем настройте ReadTimeout ленты на нужное значение:

reservation-service:
  ribbon:
    ReadTimeout: 800
    ConnectTimeout: 250
    OkToRetryOnAllOperations: true
    MaxAutoRetriesNextServer: 2
    MaxAutoRetries: 0

в этом случае после истечения времени службы 1sec в ленте он повторит попытку с помощью службы 500ms

ниже у вас есть журнал, который я получил в своем экземпляре zuul:

o.s.web.servlet.DispatcherServlet        : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/api/stories]
o.s.web.servlet.DispatcherServlet        : Last-Modified value for [/api/stories] is: -1
c.n.zuul.http.HttpServletRequestWrapper  : Path = null
c.n.zuul.http.HttpServletRequestWrapper  : Transfer-Encoding = null
c.n.zuul.http.HttpServletRequestWrapper  : Content-Encoding = null
c.n.zuul.http.HttpServletRequestWrapper  : Content-Length header = -1
c.n.loadbalancer.ZoneAwareLoadBalancer   : Zone aware logic disabled or there is only one zone
c.n.loadbalancer.LoadBalancerContext     : storyteller-api using LB returned Server: localhost:7799 for request /api/stories

---> ATTEMPTING THE SLOW SERVICE

com.netflix.niws.client.http.RestClient  : RestClient sending new Request(GET: ) http://localhost:7799/api/stories
c.n.http4.MonitoredConnectionManager     : Get connection: {}->http://localhost:7799, timeout = 250
com.netflix.http4.NamedConnectionPool    : [{}->http://localhost:7799] total kept alive: 1, total issued: 0, total allocated: 1 out of 200
com.netflix.http4.NamedConnectionPool    : No free connections [{}->http://localhost:7799][null]
com.netflix.http4.NamedConnectionPool    : Available capacity: 50 out of 50 [{}->http://localhost:7799][null]
com.netflix.http4.NamedConnectionPool    : Creating new connection [{}->http://localhost:7799]
com.netflix.http4.NFHttpClient           : Attempt 1 to execute request
com.netflix.http4.NFHttpClient           : Closing the connection.
c.n.http4.MonitoredConnectionManager     : Released connection is not reusable.
com.netflix.http4.NamedConnectionPool    : Releasing connection [{}->http://localhost:7799][null]
com.netflix.http4.NamedConnectionPool    : Notifying no-one, there are no waiting threads

--- HERE'S RIBBON'S TIMEOUT

c.n.l.reactive.LoadBalancerCommand       : Got error com.sun.jersey.api.client.ClientHandlerException: java.net.SocketTimeoutException: Read timed out when executed on server localhost:7799
c.n.loadbalancer.ZoneAwareLoadBalancer   : Zone aware logic disabled or there is only one zone
c.n.loadbalancer.LoadBalancerContext     : storyteller-api using LB returned Server: localhost:9977 for request /api/stories

---> HERE IT RETRIES

com.netflix.niws.client.http.RestClient  : RestClient sending new Request(GET: ) http://localhost:9977/api/stories
c.n.http4.MonitoredConnectionManager     : Get connection: {}->http://localhost:9977, timeout = 250
com.netflix.http4.NamedConnectionPool    : [{}->http://localhost:9977] total kept alive: 1, total issued: 0, total allocated: 1 out of 200
com.netflix.http4.NamedConnectionPool    : Getting free connection [{}->http://localhost:9977][null]
com.netflix.http4.NFHttpClient           : Stale connection check
com.netflix.http4.NFHttpClient           : Attempt 1 to execute request
com.netflix.http4.NFHttpClient           : Connection can be kept alive indefinitely
c.n.http4.MonitoredConnectionManager     : Released connection is reusable.
com.netflix.http4.NamedConnectionPool    : Releasing connection [{}->http://localhost:9977][null]
com.netflix.http4.NamedConnectionPool    : Pooling connection [{}->http://localhost:9977][null]; keep alive indefinitely
com.netflix.http4.NamedConnectionPool    : Notifying no-one, there are no waiting threads
o.s.web.servlet.DispatcherServlet        : Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling
o.s.web.servlet.DispatcherServlet        : Successfully completed request
o.s.web.servlet.DispatcherServlet        : DispatcherServlet with name 'dispatcherServlet' processing GET request for [/favicon.ico]
o.s.w.s.handler.SimpleUrlHandlerMapping  : Matching patterns for request [/favicon.ico] are [/**/favicon.ico]
o.s.w.s.handler.SimpleUrlHandlerMapping  : URI Template variables for request [/favicon.ico] are {}
o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapping [/favicon.ico] to HandlerExecutionChain with handler [ResourceHttpRequestHandler [locations=[ServletContext resource [/], class path resource [META-INF/resources/], class path resource [resources/], class path resource [static/], class path resource [public/], class path resource []], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver@a0d875d]]] and 1 interceptor
o.s.web.servlet.DispatcherServlet        : Last-Modified value for [/favicon.ico] is: -1
o.s.web.servlet.DispatcherServlet        : Null ModelAndView returned to DispatcherServlet with name 'dispatcherServlet': assuming HandlerAdapter completed request handling
o.s.web.servlet.DispatcherServlet        : Successfully completed request