Saad Ahmad Sabri created HBASE-30321:
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Summary: Implement GzipByteBuffDecompressor with on-heap and
off-heap decompression paths
Key: HBASE-30321
URL: https://issues.apache.org/jira/browse/HBASE-30321
Project: HBase
Issue Type: Improvement
Reporter: Saad Ahmad Sabri
Add GzipByteBuffDecompressor, a ByteBuffDecompressor implementation that
enables GZIP
decompression directly from/to ByteBuffer objects without intermediate byte
array copies.
Two decompression paths are supported:
- Off-heap (direct ByteBuffer): delegates to Hadoop's native
ZlibDirectDecompressor with
GZIP_FORMAT when native zlib is loaded
- On-heap (heap ByteBuffer): falls back to Java's Inflater in raw DEFLATE
(nowrap) mode,
manually skipping the GZIP header and verifying the CRC32 and ISIZE trailer
fields
Also adds GzipHFileDecompressionContext to carry per-block configuration, and
input-length validation to reject inputs too short to be a valid GZIP member.
The prior code had no ByteBuff-based GZIP decompression path, requiring byte
array
copies for on-heap scenarios. This eliminates those copies for both direct and
heap
buffer cases.
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