[jira] [Updated] (ORC-639) Improve zstd compression performance

["Ion Gaztañaga (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ORC-639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ion Gaztañaga updated ORC-639:
------------------------------
    Issue Type: Improvement  (was: Bug)

> Improve zstd compression performance
> ------------------------------------
>
>                 Key: ORC-639
>                 URL: https://issues.apache.org/jira/browse/ORC-639
>             Project: ORC
>          Issue Type: Improvement
>          Components: C++, compression
>    Affects Versions: 1.6.3
>            Reporter: Ion Gaztañaga
>            Priority: Minor
>              Labels: performance
>
> In Compression.cc, classes ZSTDCompressionStream and ZSTDDecompressionStream employ Zstd's "Simple API", which initializes the compression/decompression context each time. This context initialization includes time to initialize all compression/decompression tables.
>  
> Using the "Explicit context" API improves the performance significantly as compression/decompression tables are constructed once and reused each time "decompress" or "doBlockCompression" is called.
> We've noticed more than 15% time improvement in some applications with this change, so it seems that any ORC user using Zstd can benefit from this change.



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