Github user steveloughran commented on the pull request:
https://github.com/apache/spark/pull/6935#issuecomment-166966798
I've updated the patch with the comments, and reworked how the updated
probe works, removing the need to have provider-specific state cached, returned
in the callback and cast.
Now, when an app UI is loaded, a probe is returned which has it's
{{isUpdated()}} predicate evaluated âand if true, a cache refresh triggered.
The FS probe looks a filesize; the yarn one will do a version counter, anything
else can do there own.
This is a lot cleaner and purer: the only more puritanical option would be
to go from an abstract probe class to simply passing a function
{{Unit=>Boolean}} around.
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