chunhui shen created HBASE-9488:
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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：
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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