[GitHub] [dubbo] wangchengming666 commented on issue #8710: FAIL_OVER和FAIL_BACK 区别

[GitBox <gi...@apache.org>]

wangchengming666 commented on issue #8710:
URL: https://github.com/apache/dubbo/issues/8710#issuecomment-914146565


   FAIL_OVER我的理解是，当我们的应用是集群模式，请求当出现失败的时候，会尝试集群中其他节点。用户可以通过retries="2"设置重试次数。这是Dubbo的默认容错机制，会对请求做负载均衡。通常使用在读操作或者幂等性写操作上，但是重试操作会导致接口的延迟增大，在下游机器负载已经到达极限的情况下，重试会增加下游机器的负载。
   
   FAIL_BACK我的理解是请求失败之后，会自动记录失败的请求，并由RetryTimerTask定时重试，适用一些异步或者最终以执行的请求，官方也在javaDoc中写道：Especially useful for services of notification.适合消息通知的场景


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