hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-6757) Very inefficient behaviour of scan using FilterList
Date Wed, 12 Sep 2012 02:29:09 GMT

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

Lars Hofhansl reassigned HBASE-6757:
------------------------------------

    Assignee: 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: 0.96.0, 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.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message