Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/17295
> The penalty comes when transferring that encrypted data from disk. If the
data ends up in memory again, it is as efficient as before; but if the
evicted block needs to be transferred directly to a remote executor, then
there's now a performance penalty, since the code now uses a custom
FileRegion implementation to decrypt the data before transferring.
What's the actual difference? previously we transfer encrypted data?
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