Github user XuTingjun commented on the pull request:
https://github.com/apache/spark/pull/6545#issuecomment-108708777
I think the reason is not just because of the appCache. After my debug the
code, I found there are two mainly reasons:
1. First time send *"/history/appid"* request, the *handler "/history/*"*
will deal with it. During this, the handler adds the handlers of sparkui into
historyserver, contains the *handler "/history/appid"*. So when the second time
send *"/history/appid"* request, the *handler "/history/appid"* will deal with
it instead of *handler "/history/*"*. so the second time ui is the same with
the first one;
2. In the *handler "/history/*"*, the code use `appCache.get()` to cache
app ui. I think we should use `appCache.refresh()` instead to make it can
refresh.
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