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Posted to issues@hbase.apache.org by "huginn (Jira)" <ji...@apache.org> on 2026/09/16 13:45:00 UTC

[jira] [Created] (HBASE-30395) Avoid heap buffer copy in decompression stream fallback

huginn created HBASE-30395:
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             Summary: Avoid heap buffer copy in decompression stream fallback
                 Key: HBASE-30395
                 URL: https://issues.apache.org/jira/browse/HBASE-30395
             Project: HBase
          Issue Type: Improvement
            Reporter: huginn


Motivation

The decompression stream fallback currently uses BlockIOUtils.readFullyWithHeapBuffer, which allocates a temporary 1 KiB heap buffer and copies each read into the destination ByteBuff. This adds an avoidable heap buffer copy for on-heap ByteBuff destinations.

Proposed change

* Add a readFully(InputStream, ByteBuff, int) helper.
* Read directly into the backing array when the destination ByteBuff is on heap.
* Preserve the existing temporary-buffer fallback for direct or non-array ByteBuff instances.
* Update the compressed and uncompressed stream fallback paths in HFileBlockDefaultDecodingContext.
* Add regression tests for the direct-read and fallback paths.

Compatibility

This change does not modify the HFile file format, wire format, or configuration behavior.

Related context: HBASE-27049
Related change: https://github.com/apache/hbase/pull/8665



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