Lei Sun created ORC-997:
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Summary: Share compress output buffer among TreeWriter
Key: ORC-997
URL: https://issues.apache.org/jira/browse/ORC-997
Project: ORC
Issue Type: New Feature
Components: compression, Java
Reporter: Lei Sun
There's individual instance of `OutStream` within each TreeWriter created by
`WriterContext#createStream` method. Within `OutStream`, there are totally 3
buffers:
* current: the regular input buffer holding uncompressed, unencrypted bytes.
* compress: the output buffer holding compressed bytes
* overflow: same as "compress" but only used when the last compression output
is larger than remaining capacity of compress buffer.
Potentially the compress and overflow buffer doesn't have to be allocated
individually within each OutStream object, but shared across all of them so to
save memory. This ticket is trying to achieve that and obtain saving number
with some sort of benchmarking(yet to be defined).
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