oopDaniel commented on issue #26821: [SPARK-20656][CORE]Support Incremental parsing of event logs in SHS URL: https://github.com/apache/spark/pull/26821#issuecomment-564349390 I was also working on a PR for incremental parsing in SHS as well, and there are 2 ways to skip the parsed content: filtering by lines (the approach in this PR) and skipping by bytes (see `mergeApplicationListing`). From what I tested locally, filtering by lines roughly takes about 30 seconds for file sizes ranging from 10MB to 400MB, while skipping by bytes only takes 2 ms for a 400MB file.
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