Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18446
Yes, this is discussed ever in https://github.com/apache/spark/pull/16989 .
Only average size of blocks are stored in `HighlyCompressedMapStatus`. If
driver has enough memory, we can store more accurately in
`CompressedMapStatus`. This is pretty useful for example controlling shuffle
blocks.
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