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https://issues.apache.org/jira/browse/HBASE-28256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17807949#comment-17807949
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Hudson commented on HBASE-28256:
--------------------------------
Results for branch master
[build #987 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/987/]:
(x) *{color:red}-1 overall{color}*
----
details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/987/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/987/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/master/987/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(x) {color:red}-1 client integration test{color}
--Failed when running client tests on top of Hadoop 3. [see log for
details|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/987//artifact/output-integration/hadoop-3.log].
(note that this means we didn't check the Hadoop 3 shaded client)
> Enhance ByteBufferUtils.readVLong to read more bytes at a time
> --------------------------------------------------------------
>
> Key: HBASE-28256
> URL: https://issues.apache.org/jira/browse/HBASE-28256
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Reporter: Becker Ewing
> Assignee: Becker Ewing
> Priority: Major
> Fix For: 2.6.0, 2.5.8, 3.0.0-beta-2
>
> Attachments: ReadVLongBenchmark.zip, async-prof-rs-cpu.html
>
>
> Currently, ByteBufferUtils.readVLong is used to decode rows in all data block
> encodings in order to read the memstoreTs field. For a data block encoding
> like prefix, ByteBufferUtils.readVLong can surprisingly occupy over 50% of
> the CPU time in BufferedEncodedSeeker.decodeNext (which can be quite a hot
> method in seek operations).
>
> Since memstoreTs will typically require at least 6 bytes to store, we could
> look to vectorize the read path for readVLong to read 8 bytes at a time
> instead of a single byte at a time (like in
> https://issues.apache.org/jira/browse/HBASE-28025) in order to increase
> performance.
>
> Attached is a CPU flamegraph of a region server process which shows that we
> spend a surprising amount of time in decoding rows from the DBE in
> ByteBufferUtils.readVLong.
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