Github user mridulm commented on the issue: https://github.com/apache/spark/pull/17295 > First, keep in mind that there's no metadata that tells the receiver whether a block is encrypted or not. This means that methods like BlockManager.get, which can read block data from either local or remote sources, need to return data that is either always encrypted or always not encrypted for the same block ID. This can be solved by tagging the block data with a prefix byte - we do something similar for MapStatus (direct or broadcast).
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