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Posted to common-issues@hadoop.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2023/06/30 09:48:00 UTC
[jira] [Commented] (HADOOP-18788) Support LZ4 compressionLevel
[ https://issues.apache.org/jira/browse/HADOOP-18788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17738999#comment-17738999 ]
ASF GitHub Bot commented on HADOOP-18788:
-----------------------------------------
wenwj0 opened a new pull request, #5799:
URL: https://github.com/apache/hadoop/pull/5799
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### Description of PR
The Hadoop's LZ4 compression codec now depends on lz4-java. There two type of compressor in lz4, `fastCompressor` and `highCompressor`. The default lz4 compressor in hadoop is fastCompressor, we also can use highCompressor by using config `IO_COMPRESSION_CODEC_LZ4_USELZ4HC_DEFAULT`
When we want to use highCompressor in hadoop, we only can use the default compression level, which is level 9. while highCompressor in lz4-java supports compression level from 1 to 17.
This PR add a configuration to let users to choose different compresssionLevel for lz4 highCompressor.
### How was this patch tested?
UT
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under [ASF 2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`, `NOTICE-binary` files?
> Support LZ4 compressionLevel
> ----------------------------
>
> Key: HADOOP-18788
> URL: https://issues.apache.org/jira/browse/HADOOP-18788
> Project: Hadoop Common
> Issue Type: New Feature
> Components: common
> Reporter: wenweijian
> Priority: Minor
>
> The Hadoop's LZ4 compression codec now depends on lz4-java. There two type of compressor in lz4, `fastCompressor` and `highCompressor`. The default lz4 compressor in hadoop is fastCompressor, we also can use highCompressor by using config `IO_COMPRESSION_CODEC_LZ4_USELZ4HC_DEFAULT`
>
> When we want to use highCompressor in hadoop, we only can use the default compression level, which is level 9. while highCompressor in lz4-java supports compression level from 1 to 17.
>
> I think we can set a configuration to let users to choose different compresssionLevel for lz4 highCompressor.
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