Robert Yokota created HBASE-18559:
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             Summary: Provide metrics for concurrent calls per server to be 
able to effectively use new config setting from HBASE-16388
                 Key: HBASE-18559
                 URL: https://issues.apache.org/jira/browse/HBASE-18559
             Project: HBase
          Issue Type: Improvement
          Components: Client
            Reporter: Robert Yokota
            Priority: Minor


HBASE-16388 introduced a new configuration setting 
"hbase.client.perserver.requests.threshold " to deal with slow region servers.  
 I have back-ported the code for the new config setting to our environment, but 
I don't feel comfortable setting it in production without visibility into how 
the number of concurrent calls per server varies (especially the current high 
water mark or max in production when the cluster is healthy).  

It is straightforward to pass the value for the concurrent calls per server to 
a new histogram in MetricsConnection.  I will attach a patch that I am using to 
gain a better understanding of how setting 
"hbase.client.perserver.requests.threshold" will affect our production 
environment.



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