Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/9051#issuecomment-148715800
I'm also a bit hesitant to change Duration but if everyone agrees its a bug
we can change it. The question is it supposed to time taken across all tasks
or is it time from first task launch to time from last task end? Generally
when I think of duration I think of the first take launch time to last take end
time.
We should also perhaps add tool tips to define it.
@andrewor14 its not making the duration field less confusing its providing
more information so you can easily find stages that exhibit certain things. I
think both of these can be useful pieces of information for different reasons.
It seems like as long as its labelled properly it shouldn't be more
confusing. If you click on the stage page you have a max task time. You also
already have a tasks: Succeeded/Total. So there are already Task related things
on that page. Perhaps label it with: "Max Task Duration" or "Tasks: Max
Duration". We could use Task Time but Duration keeps wording the same. Then
add tooltip to describe if needed. I'm also fine with pulling out a few others
like average and make them hideable. I think anything at this level makes it
easier to debug things across stages but like @kayousterhout said we also don't
want to clutter it up. Personally I don't like having to click on hundreds
of Stage pages to get that information.
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