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https://issues.apache.org/jira/browse/HBASE-27710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17702058#comment-17702058
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Hudson commented on HBASE-27710:
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Results for branch branch-2.4
[build #531 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/531/]:
(x) *{color:red}-1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/531/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/531/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/531/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(x) {color:red}-1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.4/531/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> 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
> Assignee: Bryan Beaudreault
> Priority: Major
> Fix For: 2.6.0, 3.0.0-alpha-4, 2.4.17, 2.5.4
>
>
> 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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