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https://issues.apache.org/jira/browse/HBASE-12839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14274145#comment-14274145
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Elliott Clark commented on HBASE-12839:
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Don't you need to re-assign stats if the put if absent returns something
different?
> Remove synchronization in ServerStatisticsTracker
> -------------------------------------------------
>
> Key: HBASE-12839
> URL: https://issues.apache.org/jira/browse/HBASE-12839
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 2.0.0
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HBASE-12839.patch
>
>
> Remove synchronization in ServerStatisticTracker. We can use putIfAbsent
> instead of a synchronized block to add ServerStatistic objects to the
> concurrent statistics hashmap.
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