ramkrishna.s.vasudevan created HBASE-22670:
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Summary: JDK 11 and CellComparator
Key: HBASE-22670
URL: https://issues.apache.org/jira/browse/HBASE-22670
Project: HBase
Issue Type: Improvement
Affects Versions: 3.0.0
Reporter: ramkrishna.s.vasudevan
Assignee: ramkrishna.s.vasudevan
This could act as a parent JIRA for analysing JDK 11 and the Comparator impls
that we have.
Latest JDK has support for SIMD and AVX512, which means it has support for
vectorizations.
See JDK11's ArraysSupport#mismatch() and vectorizedMismatch().
We also have BufferMismatch#mismatch() which is not publicly exposed but it
uses the ArraysSupport#vectorizedMismatch().
Internally vectorizedMismatch() does something similar to what
UnsafeComparator#compareToUnsafe does. Will add about the details of the study
in further comments.
The JDK also exposes new annotations like @HotSpotIntrinsicCandidate and
@ForceInline tags that helps in inlining the intrinsic calls.
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