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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9488) Improve performance for small scan
Date Tue, 10 Sep 2013 03:07:51 GMT
chunhui shen created HBASE-9488:
-----------------------------------

             Summary: Improve performance for small scan
                 Key: HBASE-9488
                 URL: https://issues.apache.org/jira/browse/HBASE-9488
             Project: HBase
          Issue Type: Improvement
          Components: Client, Performance, Scanners
            Reporter: chunhui shen
            Assignee: chunhui shen
         Attachments: HBASE-9488-trunk.patch, test results.jpg

Now, one scan operation would call 3 RPC at least:
openScanner();
next();
closeScanner();

I think we could reduce the RPC call to one for small scan to get better performance

Also using pread is better than seek+read for small scan (For this point, see more on HBASE-7266)


Implements such a small scan as the patch, and take the performance test as following:

a.Environment´╝Ü
one regionserver; 
one client with 50 concurrent threads;
KV size:50/100;
100% LRU cache hit ratio;
Random start row of scan


b.Results:
See the picture attachment
 

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