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https://issues.apache.org/jira/browse/HBASE-16648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15508357#comment-15508357
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Hiroshi Ikeda commented on HBASE-16648:
---------------------------------------

That result seems natural. The atomicity of ConcurrentHashMap.computeIfAbsent 
is useful for, for example, establishing network connections, which are not 
easily excessively executed and immediately discarded. The atomicity apparently 
requires non-trivial logic and overhead but is indispensable for some cases, 
excluding just creating light objects.

> [JDK8] Use computeIfAbsent instead of get and putIfAbsent
> ---------------------------------------------------------
>
>                 Key: HBASE-16648
>                 URL: https://issues.apache.org/jira/browse/HBASE-16648
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Performance
>    Affects Versions: 2.0.0
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16648-v1.patch, HBASE-16648-v2.patch, 
> HBASE-16648.patch
>
>




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