Github user steveloughran commented on the pull request:

    https://github.com/apache/spark/pull/6545#issuecomment-114656223
  
    -yes, independent. SPARK-1537: implements the HistoryProvider in YARN, gets 
it from ATS, etc, etc. The JIRA we are looking at here, where my patch is 
[pull/6935](https://github.com/apache/spark/pull/6935) says "we ask the 
provider for the app UI again if it is (a) incomplete and (b) being asked for 
after some defined interval" . I know deciding what's a good interval is hard, 
as there's a tradeoff in responsiveness and system load —I'll leave it to 
others to suggest a good default there.


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