Github user vijoshi commented on the issue:
https://github.com/apache/spark/pull/15410
@tgravescs - you're right - for newer logs that are generated, there could
be a window of time (10 secs or whatever the user configures) where the new
logs are not picked up for replay and the UI doesn't say anything about them.
however the issue we see is more with old completed apps. a little after
history server startup, user browses to the app list and has no idea why the
older completed apps are missing (perhaps those that were visible just before
the history server was restarted). since the polling for logs/replay is
scheduled immediately as part of history server startup (zero delay for the
first round), this fix could help these cases.
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