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From "Chao Shi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9488) Improve performance for small scan
Date Fri, 18 Oct 2013 05:20:42 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13798807#comment-13798807
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Chao Shi commented on HBASE-9488:
---------------------------------

Hi [~lhofhansl], will this be checked into 0.94 branch?

> 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
>             Fix For: 0.98.0, 0.96.0
>
>         Attachments: hbase-9488-94-v3.patch, HBASE-9488-trunk.patch, HBASE-9488-trunkV2.patch,
HBASE-9488-trunkV3.patch, HBASE-9488-trunkV4.patch, HBASE-9488-trunkV4.patch, HBASE-9488-trunkV5.patch,
mergeRpcCallForScan.patch, test results.jpg
>
>
> review board:
> https://reviews.apache.org/r/14059/
> *Performance Improvement*
> Test shows about 1.5~3X improvement for small scan where limit<=50 under cache hit
ratio=100%.
> See more performance test result from 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 object, others are the same
> 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
> patched on 0.94 version
> 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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