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https://issues.apache.org/jira/browse/IMPALA-9997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joe McDonnell resolved IMPALA-9997.
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Fix Version/s: Impala 4.0
Resolution: Fixed
> Update to a newer version of LZ4
> --------------------------------
>
> Key: IMPALA-9997
> URL: https://issues.apache.org/jira/browse/IMPALA-9997
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 4.0
> Reporter: Joe McDonnell
> Priority: Major
> Labels: native-toolchain
> Fix For: Impala 4.0
>
>
> Impala currently uses LZ4 version 1.7.5. The LZ4 project lists several
> performance improvements in later versions:
>
> {noformat}
> v1.9.0
> perf: large decompression speed improvement on x86/x64 (up to +20%) by
> @djwatson
> ...
> v1.8.3
> perf: minor decompression speed improvement (~+2%) with gcc
> ...
> v1.8.2
> perf: *much* faster dictionary compression on small files, by @felixhandte
> perf: improved decompression speed and binary size, by Alexey Tourbin (@svpv)
> perf: slightly faster HC compression and decompression speed
> perf: very small compression ratio improvement
> ...
> v1.8.1
> perf : faster and stronger ultra modes (levels 10+)
> perf : slightly faster compression and decompression speed
> perf : fix bad degenerative case, reported by @c-morgenstern
> ...{noformat}
> [https://github.com/lz4/lz4/blob/dev/NEWS]
>
>
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