Huginn-kio opened a new pull request, #8665: URL: https://github.com/apache/hbase/pull/8665
## HBASE-27049 ### Summary Avoid an intermediate heap buffer when reading decompressed stream data into an on-heap `ByteBuff`. ### Root cause The stream fallback in `HFileBlockDefaultDecodingContext` uses `BlockIOUtils.readFullyWithHeapBuffer`, which allocates a temporary heap buffer and copies each read into the destination `ByteBuff`. This adds an avoidable copy for on-heap destinations. ### Fix - Read directly into the backing array when the destination `ByteBuff` exposes one. - Preserve the existing temporary-buffer fallback for direct or non-array `ByteBuff` instances. - Use the new helper for compressed stream fallback and uncompressed stream reads. - Add regression coverage for both the direct-read and fallback paths. ### Compatibility - Public API impact: none; `BlockIOUtils` remains internal. - Configuration impact: none. - Persisted file format impact: none. - Wire format impact: none. ### Testing - `mvn -pl hbase-server -am -Dtest=TestBlockIOUtils -DfailIfNoTests=false -DskipITs test` - `mvn -pl hbase-common -DskipTests -Dcheckstyle.includes="**/BlockIOUtils.java,**/HFileBlockDefaultDecodingContext.java" checkstyle:check` - `mvn -pl hbase-server -DskipTests -Dcheckstyle.includes="**/TestBlockIOUtils.java" checkstyle:check` -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
