Gian Merlino created PARQUET-2429:
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Summary: Direct buffer churn in NonBlockedDecompressor
Key: PARQUET-2429
URL: https://issues.apache.org/jira/browse/PARQUET-2429
Project: Parquet
Issue Type: Bug
Reporter: Gian Merlino
NonBlockedDecompressor (and NonBlockedCompressor) are grown one chunk at a time
as the class receives successive setInput calls. When decompressing a 64MB
block using a 4KB chunk size, this leads to thousands of allocations and
deallocations totaling GBs of memory. This can be avoided by doubling the
buffer each time rather than adding on a minimal amount of new space.
In a practical scenario I ran into, the time taken to read a 140MB Parquet file
was reduced from 35s to <2s.
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