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https://issues.apache.org/jira/browse/ARROW-9648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-9648.
-----------------------------------
Fix Version/s: 7.0.0
Resolution: Fixed
Issue resolved by pull request 11810
[https://github.com/apache/arrow/pull/11810]
> [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
> Assignee: Joost Hoozemans
> Priority: Minor
> Labels: good-first-issue, pull-request-available
> Fix For: 7.0.0
>
> Time Spent: 4.5h
> Remaining Estimate: 0h
>
> 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
>
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