Ion Gaztañaga created ORC-639:
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Summary: Improve zstd compression performance
Key: ORC-639
URL: https://issues.apache.org/jira/browse/ORC-639
Project: ORC
Issue Type: Bug
Components: C++, compression
Affects Versions: 1.6.3
Reporter: Ion Gaztañaga
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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