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Antoine Pitrou commented on ARROW-9648: --------------------------------------- Filed https://github.com/lz4/lz4/issues/1041 for LZ4 block compression. > [C++] LZ4 compression level not supported > ----------------------------------------- > > Key: ARROW-9648 > URL: https://issues.apache.org/jira/browse/ARROW-9648 > Project: Apache Arrow > Issue Type: Bug > Components: C++ > Reporter: Pierre > Priority: Minor > > 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. > {code:python} > from pyarrow import parquet as pq > pq.write_table(data, file, compression='LZ4', compression_level=12) > {code} > Error message > {code:bash} > 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. > {code} > However man page of LZ4 states the following > {code:bash} > 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. > {code} > Please, can you activate compression levels for LZ4? > Thanks, > Bests > -- This message was sent by Atlassian Jira (v8.20.1#820001)