[GitHub] [spark] dongjoon-hyun commented on issue #25494: [SPARK-28655] [patch] Support to cut the event log, and solve the history server was too slow when event log is too large.

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dongjoon-hyun commented on issue #25494: [SPARK-28655] [patch] Support to cut the event log, and solve the history server was too slow when event log is too large.
URL: https://github.com/apache/spark/pull/25494#issuecomment-522770970
 
 
   Hi, @shaohk . Thank you for making PRs again. But, SPARK-28655 is an improvement PR and Apache Spark don't allow new feature backporting. So, an improvement PR to non-`master` branch is invalid from the beginning. Like your previous PR, I need to close this PR, https://github.com/apache/spark/pull/25387 .
   
   You can open this to `master` branch. BTW, the new PR description should answer @srowen 's question when you reopen this to `master`.
   > This isn't opened vs master. Also, there are already several properties that let you limit how much history is retained. Why is this needed?

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