Github user wuchong commented on the pull request:
https://github.com/apache/storm/pull/1082#issuecomment-189140525
I find that when we set `nimbus.seeds` as ip, such as `nimbus.seeds:
[10.0.0.10]`. Then a nimbus for 10.0.0.10 will be 'Offline'.
That's because the nimbus information saved in zk is CanonicalHostName. But
the nimbus seeds we set maybe ip. At last, the nimbus with ip will be
'Offline'.
```
offline-nimbuses (clojure.set/difference nimbus-seeds alive-nimbuses)
```
<img width="1268" alt="2016-02-26 2 51 43"
src="https://cloud.githubusercontent.com/assets/5378924/13345347/10e3c232-dc99-11e5-9350-5ff1c6c65224.png";>
Maybe we need to change all nimbus-seeds to hostname, before do
set/difference.
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