Thanks for providing this dataset.
It seems that two files 000_00015.parquet and 000_00027.parquet in data/CC-MAIN-2015-32 have corrupt page headers.
000_00015.parquet
000_00027.parquet
data/CC-MAIN-2015-32
Pyarrow localizes the damage in 000_00015 to row groups 163–171.
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