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Posted to issues@arrow.apache.org by "Wes McKinney (Jira)" <ji...@apache.org> on 2019/08/26 03:10:00 UTC
[jira] [Resolved] (ARROW-6216) [C++] Allow user to select the
compression level
[ https://issues.apache.org/jira/browse/ARROW-6216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wes McKinney resolved ARROW-6216.
---------------------------------
Fix Version/s: 0.15.0
Resolution: Fixed
Issue resolved by pull request 5192
[https://github.com/apache/arrow/pull/5192]
> [C++] Allow user to select the compression level
> ------------------------------------------------
>
> Key: ARROW-6216
> URL: https://issues.apache.org/jira/browse/ARROW-6216
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Martin Radev
> Assignee: Martin Radev
> Priority: Minor
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Original Estimate: 2h
> Time Spent: 13h 40m
> Remaining Estimate: 0h
>
> The compression level selected in Arrow for ZSTD is 1 which is the minimal compression level for the compressor. This leads to very high compression speed at the sacrifice of compression ratio.
> The user should be allowed to select the compression level as both speed and ratio are data specific.
> The proposed solution is to expose the knob via an environment variable such as ARROW_ZSTD_COMPRESSION_LEVEL.
> Example:
> export ARROW_ZSTD_COMPRESSION_LEVEL=10
> ./my_parquet_app
> Here is a test run with compression levels of 1, 2 and 5:
> Level Time (s) Size (mb)
> 1 13.02 181
> 2 13.10 177
> 5 19.44 148
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