Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/8744#issuecomment-145818164
@tgravescs: ATS v1. What we got from the ATS team was a commitment to not
break that API at some ws/v1/ endpoint they'll continue to offer.
However, V2 is designed to address other things (like availability), as
well as scale. 1.x clients won't get that.
This implementation is designed to keep load on ATS down (you can tell it
not to do any refresh in the background), but an 8GB event, while it should be
handled by leveldb, is a pretty serious json ser/deser load at both ends. I'd
like to move to background playback where the getAppUI() returns the UI, but
the UI is built up asynchronously, as you'd get from a running app. The
filesystem history provider could do the same thing.
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