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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7612) [JDK8] Replace use of high-scale-lib counters with intrinsic facilities
Date Sun, 18 Sep 2016 07:25:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15500463#comment-15500463

Duo Zhang commented on HBASE-7612:

The failed test can not be reproduced locally and there is no log so I do not know what is
the cause...

And the findbugs warning is strange, it says that there is a null check at line 182 of EncodedDataBlock.java
but there is no null check there...

> [JDK8] Replace use of high-scale-lib counters with intrinsic facilities
> -----------------------------------------------------------------------
>                 Key: HBASE-7612
>                 URL: https://issues.apache.org/jira/browse/HBASE-7612
>             Project: HBase
>          Issue Type: Sub-task
>          Components: metrics
>    Affects Versions: 2.0.0
>            Reporter: Andrew Purtell
>            Assignee: Duo Zhang
>            Priority: Trivial
>             Fix For: 2.0.0
>         Attachments: HBASE-7612.patch
> JEP155 introduces a few new classes (DoubleAccumulator, DoubleAdder, LongAccumulator,
LongAdder) that "internally employ contention-reduction techniques that provide huge throughput
improvements as compared to Atomic variables". There are applications of these where we are
currently using Cliff Click's high-scale-lib and for metrics.
> See http://openjdk.java.net/jeps/155

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