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Posted to issues@hbase.apache.org by "ramkrishna.s.vasudevan (JIRA)" <ji...@apache.org> on 2019/07/12 05:53:00 UTC

[jira] [Updated] (HBASE-22670) JDK 11 and CellComparator

     [ https://issues.apache.org/jira/browse/HBASE-22670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ramkrishna.s.vasudevan updated HBASE-22670:
-------------------------------------------
    Labels: jdk11  (was: )

> 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
>            Priority: Major
>              Labels: jdk11
>
> 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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