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From "LiuLei (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-2247) [performance] Small scans should run like a random-read
Date Sun, 23 Sep 2012 06:21:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461331#comment-13461331

LiuLei commented on HBASE-2247:

Hi stackļ¼Œ I  think We can new smallScan() method in HTable, the method use pread to read
data and  the method return all data in one hfile block.  I think we can let users to decide
use smallScan() method or getScanner method.

> [performance] Small scans should run like a random-read
> -------------------------------------------------------
>                 Key: HBASE-2247
>                 URL: https://issues.apache.org/jira/browse/HBASE-2247
>             Project: HBase
>          Issue Type: Improvement
>          Components: Performance
>            Reporter: stack
> hbase-2180 added pread whenever we do a get -- random-read -- and kept the old sync+position+read
for when scanning.   In between is the case of small scans.  Small scans of 0-100 or so rows
where the cells are small will likely fit a single hfile blocksize, especially if its the
default 64k.  We should recognize small scans and flip to random-read to satisfy (somehow).
 It'll up the performance a bit.

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