Vensence commented on issue #2441: Frequent register and unregister of services 
using Redis registry
URL: 
https://github.com/apache/incubator-dubbo/issues/2441#issuecomment-420927108
 
 
   yes it use System.currentTimeMillis() to determin the service is expired or 
not. According to the code the RedisRegistry has a expireFuture to check the 
service is expired or not every 30000ms(by default, and I use the default 
value), no matter the machine time is correct or not it should check every 30s, 
it couldn't be so frequently. I am really confusing now, these things flying 
around in my head for several days

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