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https://issues.apache.org/jira/browse/HBASE-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762031#comment-13762031
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Elliott Clark commented on HBASE-9471:
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Commented on github. There's also a test failure that we've seen in unit
tests. Hopefully we can get these two issues fixed in time for the next rc.
> htrace synchronized on getInstance
> ----------------------------------
>
> Key: HBASE-9471
> URL: https://issues.apache.org/jira/browse/HBASE-9471
> Project: HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.98.0, 0.96.0
> Reporter: Nicolas Liochon
> Assignee: Nicolas Liochon
> Priority: Minor
>
> When doing tests on cached data, one of the bottleneck is the getInstance()
> on HTrace, called in RequestContext#set() --> Trace.isTracing()
> When it's fixed, we see threads blocked in sendResponse and in the metrics
> (with hadoop 1).
> The difference is not huge (it's in the range 0-5%), but there is no reason
> to keep this.
> I'm sending a pull request to htrace.
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