[ARROW-9648] [C++] LZ4 compression level not supported

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 7.0.0
• Component/s: C++
• Labels: good-first-issue pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/17299
• Assignee: Joost Hoozemans
• Reporter: Pierre
• Created: 04/Aug/20 18:51
• Updated: 11/Jan/23 08:08
• Resolved: 07/Dec/21 13:15

Description

Hi,

I am currently checking the different compression codecs available when writing parquet files.

Testing LZ4, I got the error message that compression level is not supported.

from pyarrow import parquet as pq

pq.write_table(data, file, compression='LZ4', compression_level=12)

Error message

 File "pyarrow/_parquet.pyx", line 1374, in pyarrow._parquet.ParquetWriter.write_table

File "pyarrow/error.pxi", line 99, in pyarrow.lib.check_status

OSError: Invalid: LZ4 doesn't support setting a compression level.

However man page of LZ4 states the following

Operation modifiers
 -# Compression level, with # being any value from 1 to 12. Higher
 values trade compression speed for compression ratio. Values
 above 12 are considered the same as 12. Recommended values are 1
 for fast compression (default), and 9 for high compression.
 Speed/compression trade-off will vary depending on data to com‐
 press. Decompression speed remains fast at all settings.

Please, can you activate compression levels for LZ4?

Thanks,

Bests

 

Issue Links

• links to: GitHub Pull Request #11810