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https://issues.apache.org/jira/browse/HBASE-17332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15760834#comment-15760834
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binlijin commented on HBASE-17332:
----------------------------------
Because idArray[Byte.MAX_VALUE] = null, so throw IllegalArgumentException.
{code}
if (algorithm == null) {
throw new IllegalArgumentException(String.format(
"There is no data block encoder for given id '%d'",
(int) dataBlockEncodingId));
}
{code}
> 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.V2.patch,
> HBASE-17332.V3.patch, 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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