Comments (1)
Finally got around to debugging this issue. It turns out this is a pathological case, since the file above has only one row group with 46 million rows:
$ du -h /Users/markogrujic/Downloads/area1.parquet
2.4G /Users/markogrujic/Downloads/area1.parquet
$ parquet meta /Users/markogrujic/Downloads/area1.parquet
File path: /Users/markogrujic/Downloads/area1.parquet
Created by: parquet-cpp version 1.5.1-SNAPSHOT
...
Row group 0: count: 46234315 54.89 B records start: 4 total(compressed): 2.363 GB total(uncompressed):2.363 GB
--------------------------------------------------------------------------------
type encodings count avg size nulls min / max
X DOUBLE S RBR_ 46234315 7.67 B 0 "-268.5730217805162" / "-68.00000035424296"
Y DOUBLE S RBR_ 46234315 7.56 B 0 "-298.7632813729358" / "-108.00000066228672"
Z DOUBLE S RBR_ 46234315 7.11 B 0 "-3.1149840059754865" / "97.65842918119495"
X_noise DOUBLE S RBR_ 46234315 7.81 B 0 "-268.5741613914974" / "-67.99562912963299"
Y_noise DOUBLE S RBR_ 46234315 7.68 B 0 "-298.7601570277598" / "-107.99524445315944"
Z_noise DOUBLE S RBR_ 46234315 8.01 B 0 "-3.119372332345796" / "97.66003008163513"
R DOUBLE S RBR_ 46234315 0.72 B 0 "-0.0" / "255.0"
G DOUBLE S RBR_ 46234315 0.72 B 0 "-0.0" / "255.0"
B DOUBLE S RBR_ 46234315 0.71 B 0 "-0.0" / "255.0"
time DOUBLE S RBR_ 46234315 6.92 B 0 "1087.0830847224747" / "2118.595793055997"
eol DOUBLE S RBR_ 46234315 0.00 B 0 "-0.0" / "1.0"
label DOUBLE S RBR_ 46234315 0.00 B 0 "-0.0" / "8.0"
On the other hand, the arrow's async parquet reader ultimately streams the record batches after loading the whole row group in memory:
It means that in this case the reader effectively loads the entire file in memory upon initiating the stream, which explains the memory profile.
Since there's nothing we can do in this case I'm closing this issue.
from seafowl.
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from seafowl.