router 手动创建 routee 时，监管策略如何重启？
When routees are created manually for a router, how are they restarted by the supervision strategy?
当有人像我在这个问题中所做的那样手动创建路由时，我问 。 routee需要重启时监管如何处理？
Routees that are created by a pool router will be created as the router's children. The router is therefore also the children's supervisor.
The supervision strategy of the router actor can be configured with the supervisorStrategy property of the Pool. If no configuration is provided, routers default to a strategy of “always escalate”. This means that errors are passed up to the router's supervisor for handling. The router's supervisor will decide what to do about any errors.
Note the router's supervisor will treat the error as an error with the router itself. Therefore a directive to stop or restart will cause the router itself to stop or restart. The router, in turn, will cause its children to stop and restart.
It should be mentioned that the router's restart behavior has been overridden so that a restart, while still re-creating the children, will still preserve the same number of actors in the pool.
This means that if you have not specified supervisorStrategy of the router or its parent a failure in a routee will escalate to the parent of the router, which will by default restart the router, which will restart all routees (it uses Escalate and does not stop routees during restart). The reason is to make the default behave such that adding withRouter to a child’s definition does not change the supervision strategy applied to the child. This might be an inefficiency that you can avoid by specifying the strategy when defining the router.
Setting the strategy is easily done:
final SupervisorStrategy strategy =
new OneForOneStrategy(5, Duration.create(1, TimeUnit.MINUTES),
Collections.<Class<? extends Throwable>>singletonList(Exception.class));
final ActorRef router = system.actorOf(new RoundRobinPool(5).
withSupervisorStrategy(strategy).props(Props.create(Echo.class)));
当有人像我在这个问题中所做的那样手动创建路由时，我问
Routees that are created by a pool router will be created as the router's children. The router is therefore also the children's supervisor.
The supervision strategy of the router actor can be configured with the supervisorStrategy property of the Pool. If no configuration is provided, routers default to a strategy of “always escalate”. This means that errors are passed up to the router's supervisor for handling. The router's supervisor will decide what to do about any errors.
Note the router's supervisor will treat the error as an error with the router itself. Therefore a directive to stop or restart will cause the router itself to stop or restart. The router, in turn, will cause its children to stop and restart.
It should be mentioned that the router's restart behavior has been overridden so that a restart, while still re-creating the children, will still preserve the same number of actors in the pool.
This means that if you have not specified supervisorStrategy of the router or its parent a failure in a routee will escalate to the parent of the router, which will by default restart the router, which will restart all routees (it uses Escalate and does not stop routees during restart). The reason is to make the default behave such that adding withRouter to a child’s definition does not change the supervision strategy applied to the child. This might be an inefficiency that you can avoid by specifying the strategy when defining the router.
Setting the strategy is easily done:
final SupervisorStrategy strategy =
new OneForOneStrategy(5, Duration.create(1, TimeUnit.MINUTES),
Collections.<Class<? extends Throwable>>singletonList(Exception.class));
final ActorRef router = system.actorOf(new RoundRobinPool(5).
withSupervisorStrategy(strategy).props(Props.create(Echo.class)));