Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/16603
> what is reported by a consumer as used need not match what it releases as
freed
Right, but if even the sum of the reported used memory is not enough for
the new consumer, spilling existing consumers is just causing harm. You can
just report there's not enough memory without spilling anything.
But it's fine to leave that for a separate discussion, since I believe
that's how the current code behaves anyway.
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