[jira] [Resolved] (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:all-tabpanel ]

Elliott Clark resolved HBASE-9471.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 0.96.0
                   0.98.0
     Hadoop Flags: Reviewed

Committed to 0.96 and trunk. Thanks [~stack] and [~nkeywal]
                
> 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: Elliott Clark
>            Priority: Minor
>             Fix For: 0.98.0, 0.96.0
>
>         Attachments: HBASE-9471-0.patch
>
>
> 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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