Bryan Beaudreault created HBASE-27710:
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Summary: ByteBuff ref counting is too expensive for on-heap buffers
Key: HBASE-27710
URL: https://issues.apache.org/jira/browse/HBASE-27710
Project: HBase
Issue Type: Improvement
Reporter: Bryan Beaudreault
We recently were upgrading an internal project's hbase client from 1.2 to 2.5.
The project does raw HFile.Reader reading of some hfiles. We noticed an over 4x
performance regression with the new client. Profiling showed that the majority
of the time was spent in SingleByteBuff.checkRefCount. That ref counting is
necessary for off-heap reads, but this case was using on-heap. Removing
checkRefCount eliminated the regression.
I asked on the dev list and we agreed to remove checkRefCount calls for on-heap
buffers: https://lists.apache.org/thread/2qm0g8fbxb0no4ozfx7bw8xmkryt4zz0
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