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https://issues.apache.org/jira/browse/HBASE-17332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15759941#comment-15759941
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binlijin commented on HBASE-17332:
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There is no much different for the E2E QPS, but we can see with the patch this
method is not hot method any more.
> Replace HashMap to Array for DataBlockEncoding.idToEncoding
> -----------------------------------------------------------
>
> Key: HBASE-17332
> URL: https://issues.apache.org/jira/browse/HBASE-17332
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: binlijin
> Assignee: binlijin
> Fix For: 2.0.0
>
> Attachments: DBE.idToEncoding.png,
> DBE.idToEncoding_afterOptimize.png, HBASE-17332.patch
>
>
> Array is faster than HashMap also no need to autoboxing.
> I can see the DataBlockEncoding#getDataBlockEncoderById is a hot method if
> enable encoding in my perf test(Random read, all data cache in
> LruBlockCache).
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