hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9488) Improve performance for small scan
Date Tue, 10 Sep 2013 03:11:51 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

chunhui shen updated HBASE-9488:
--------------------------------

    Description: 
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


*Usage:*
Scan scan = new Scan(startRow,stopRow);
scan.setSmall(true);
ResultScanner scanner = table.getScanner(scan);

Set the new 'small' attribute as true for scan, others are the same
 

  was:
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
 

    
> 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
> *Usage:*
> Scan scan = new Scan(startRow,stopRow);
> scan.setSmall(true);
> ResultScanner scanner = table.getScanner(scan);
> Set the new 'small' attribute as true for scan, others are the same
>  

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message