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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1576) TIF needs to be able to set scanner caching size for smaller row tables & performance
Date Wed, 24 Jun 2009 00:38:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723383#action_12723383
] 

Jean-Daniel Cryans commented on HBASE-1576:
-------------------------------------------

bq. Should the default also be upped to something like 30 as before, or even 100? I mean the
default as set by TableMapReduceUtil, not in hbase-default.xml.

Every time I had to change it that was for a MR job where I was doing heavy processing on
each row. So -1 on that.

> 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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