Github user tsudukim commented on the pull request:
https://github.com/apache/spark/pull/6545#issuecomment-107833438
I wonder if it is a good idea that we have a custom HandlerCollection.
The cause of the problem is the cache mechanism in `HistoryServer`. The
current HistoryServer caches all UI object in `appCache` regardless of whether
it is completed or incomplete. I think it's reasonable to fix the cache layer
not to retain when incomplete job.
Setting `spark.history.retainedApplications = 0` (in order not to use
cache) can be a workaround for this problem.
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