Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/8880#issuecomment-163371575
> Yes, I agree that we should encrypt the compressed stream when writing.
However, BlockStoreShuffleReader should be opposite to the write path
Sorry, I don't follow. Why does that mean the change cannot be made? Just
invert the streams ordering in both places. Writer wraps the compressed stream
with an encrypting stream, reader wraps the unencrypting stream with the
uncompressing stream.
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