Github user vanzin commented on the issue: https://github.com/apache/spark/pull/17295 > What's the actual difference? previously we transfer encrypted data? Yes. The previous version of the code would transfer the encrypted file over to the receiver, and the encrypted data for serialized blocks would also be stored in `MemoryStore` (and then decrypted on every use). That means the files could just be mmap'ed for transfer, which is faster than the `ReadableByteChannel` path even without encryption in the picture. (If you consider the previous code had to decrypt from the `MemoryStore` on every read, you can end up with better performance overall with this patch.) But this caused all the other issues with making the `BlockManager` harder to use when encryption was on, so I think this is a better solution.
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