supervisor uptime

[Sa Li]

Hi, All

I didn't notice before, but just see the uptime of storm supervisor node in
storm UI are
      7h32m42s
      1d 21h 53m 10s
      9h 3m 31s
      8h 10m 2s

However, they should be up for few weeks, since I've been running
topologies on the cluster. I actually use upstart to control storm
supervisor process? Does this mean, my supervisor process might fails in
the middle, but upstart restart them automatically? does this happen often?
what is the impact?

thanks

AL