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Date: Wed, 12 Sep 2012 04:32:07 +1100 (NCT)
From: "Andrew Purtell (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-6757) Very inefficient behaviour of scan
 using FilterList
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    [ https://issues.apache.org/jira/browse/HBASE-6757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453203#comment-13453203 ] 

Andrew Purtell commented on HBASE-6757:
---------------------------------------

+1 for 0.94 as well. The current behavior is wrong. 
                
> Very inefficient behaviour of scan using FilterList
> ---------------------------------------------------
>
>                 Key: HBASE-6757
>                 URL: https://issues.apache.org/jira/browse/HBASE-6757
>             Project: HBase
>          Issue Type: Improvement
>          Components: filters
>    Affects Versions: 0.90.6
>            Reporter: Jerry Lam
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 6757.txt, CopyOfTestColumnPrefixFilter.java, DisplayFilter.java
>
>
> The behaviour of scan is very inefficient when using with FilterList.
> The FilterList rewrites the return code from NEXT_ROW to SKIP from a filter if Operator.MUST_PASS_ALL is used. 
> This happens when using ColumnPrefixFilter. Even though the ColumnPrefixFilter indicates to jump to NEXT_ROW because no further match can be found, the scan continues to scan all versions of a column in that row and all columns of that row because the ReturnCode from ColumnPrefixFilter has been rewritten by the FilterList from NEXT_ROW to SKIP. 
> This is particularly inefficient when there are many versions in a column because the check is performed on all versions of the column instead of just by checking the qualifier of the column name.

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