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Date: Tue, 23 Jun 2009 17:31:07 -0700 (PDT)
From: "Andrew Purtell (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1576) TIF needs to be able to set scanner
 caching size for smaller row tables & performance
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    [ https://issues.apache.org/jira/browse/HBASE-1576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723381#action_12723381 ] 

Andrew Purtell commented on HBASE-1576:
---------------------------------------

Should the default also be upped to something like 30 as before, or even 100? 

> TIF needs to be able to set scanner caching size for smaller row tables & performance
> -------------------------------------------------------------------------------------
>
>                 Key: HBASE-1576
>                 URL: https://issues.apache.org/jira/browse/HBASE-1576
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.20.0
>            Reporter: ryan rawson
>            Assignee: Andrew Purtell
>            Priority: Critical
>             Fix For: 0.20.0
>
>         Attachments: HBASE-1576.patch
>
>
> TIF goes with the default scanner caching size (1).  When each row is processed very fast and is small, this limits the overall performance.  By setting a higher scanner caching level you can achieve 100x+ the performance with the exact same map-reduce and table.

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