Github user CharlesYeh commented on the pull request:
https://github.com/apache/spark/pull/9571#issuecomment-155863566
I'm assuming you didn't make a HistorySource in HistoryServer (what
MasterSource in Master does) because it requires the MetricsSystem.
Where does MetricsSystem require a SparkContext? It looks like it just
takes SparkConf which HistoryServer has.
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