Github user dongjoon-hyun commented on the issue: https://github.com/apache/spark/pull/22601 `spark.history.fs.endEventReparseChunkSize` and `spark.history.fs.inProgressOptimization.enabled` exist since `branch-2.4`. So, this PR lands at master/2.4. If you want to fix some in `branch-2.3`, please make another PR. :)
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