Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/2573#issuecomment-57285525
Actually HistoryServer can read application logs generated by Spark apps on
another node. The `spark.eventLog.dir` could be different between this and
that. So on my opinion it is flexible to seperate the two configs.
Also `spark.eventLog.dir` is activated only if `spark.eventLog.enabled` is
true. If HistoryServer load data in `spark.eventLog.dir`, is it necessary to
check value of `spark.eventLog.enabled`?
In a word current solution is simple and loose coupling.
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