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https://issues.apache.org/jira/browse/ORC-639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17175883#comment-17175883
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Dongjoon Hyun commented on ORC-639:
-----------------------------------
Thank you, [~igaztanaga]. Merged to branch-1.6 for Apache Orc 1.6.4.
> 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
> Assignee: Ion Gaztañaga
> Priority: Minor
> Labels: performance
> Fix For: 1.6.4
>
>
> 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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