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https://issues.apache.org/jira/browse/HBASE-25998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17366078#comment-17366078
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Hudson commented on HBASE-25998:
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Results for branch branch-2.4
[build #145 on
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2.4/145/]:
(/) *{color:green}+1 overall{color}*
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details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2.4/145/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
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report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2.4/145/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
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(/) {color:green}+1 jdk11 hadoop3 checks{color}
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(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> Revisit synchronization in SyncFuture
> -------------------------------------
>
> Key: HBASE-25998
> URL: https://issues.apache.org/jira/browse/HBASE-25998
> Project: HBase
> Issue Type: Improvement
> Components: Performance, regionserver, wal
> Affects Versions: 3.0.0-alpha-1, 1.7.0, 2.5.0
> Reporter: Bharath Vissapragada
> Assignee: Bharath Vissapragada
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.5.0, 2.3.6, 2.4.5
>
> Attachments: monitor-overhead-1.png, monitor-overhead-2.png
>
>
> While working on HBASE-25984, I noticed some weird frames in the flame graphs
> around monitor entry exit consuming a lot of CPU cycles (see attached
> images). Noticed that the synchronization there is too coarse grained and
> sometimes unnecessary. I did a simple patch that switched to a reentrant lock
> based synchronization with condition variable rather than a busy wait and
> that showed 70-80% increased throughput in WAL PE. Seems too good to be
> true.. (more details in the comments).
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