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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6757) Very inefficient behaviour of scan using FilterList
Date Sun, 07 Apr 2013 04:59:19 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-6757:
-------------------------

    Fix Version/s:     (was: 0.95.0)
                   0.94.2

Fix up after bulk move overwrote some 0.94.2 fix versions w/ 0.95.0 (Noticed by Lars Hofhansl)
                
> Very inefficient behaviour of scan using FilterList
> ---------------------------------------------------
>
>                 Key: HBASE-6757
>                 URL: https://issues.apache.org/jira/browse/HBASE-6757
>             Project: HBase
>          Issue Type: Bug
>          Components: Filters
>    Affects Versions: 0.90.6
>            Reporter: Jerry Lam
>            Assignee: Lars Hofhansl
>             Fix For: 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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