[jira] [Commented] (HBASE-9471) htrace synchronized on getInstance

["Elliott Clark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-9471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762031#comment-13762031 ] 

Elliott Clark commented on HBASE-9471:
--------------------------------------

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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