Elliott Clark created HBASE-16305:
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             Summary: Multi threaded scan performance bottlenecked on Connection
                 Key: HBASE-16305
                 URL: https://issues.apache.org/jira/browse/HBASE-16305
             Project: HBase
          Issue Type: Bug
            Reporter: Elliott Clark


Pretty simple repro. On a single region server host ~10 or more regions. Then 
for each region spawn a thread that starts a scan. Try an pull the scan as fast 
as possible.

If all the scans are created through the same connection then it's slow. If all 
the scans are created through different connections then the scan speed is 
doubled.

Since we recommend a single connection per application this is pretty 
surprising behavior.



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