Github user JeetKunDoug commented on the issue:
https://github.com/apache/spark/pull/21322
@cloud-fan yes, essentially... the only thing I'd add is that it's bound to
"whatever scope the driver sees fit to bind it to", if that makes sense. In my
particular case, it happens to be a stage, but it's possible that others may
find there are longer-lived cases, all of which should be supportable... As
this is my side-project for work, it may take me a bit to get something more
together, but I'll see what I can sketch out. Would you prefer some sort of
design doc, or is an update to this PR (or a new one) appropriate?
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