wu-sheng opened a new issue #1181: Provide dynamic refresh file in agent
URL: https://github.com/apache/incubator-skywalking/issues/1181
   This requirement came from the upgrade, SkyWalking's agent and protocol are 
stable enough, and didn't need to update for a long time. But considering right 
now, there are a lot of buffer in agent, so end users must reboot the monitored 
applications to upgrade backend, which caused by backend upgrade is not 
   I proposal to provide a dynamic flush like this:
   # false by default, change to `true` if need runtime refresh.
   # After refresh happends, agent will rewrite this to true.
   # default value is reboot time. After refresh happends, agent will rewrite 
this timestamp
   last_refresh_time = xxxxx
   By having this feature, the backend break upgrade should be:
   1. Stop all backends.
   1. Clear the ElasticSearch data.
   1. Set all flush file to **true**, and wait all agents refreshed and updated 
the new refresh time.
   1. Start up new version collector.
   FYI @hanahmily @peng-yongsheng @liuhaoyang @yuleyule66

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