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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6757) Very inefficient behaviour of scan using FilterList
Date Fri, 05 Oct 2012 00:38:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469906#comment-13469906

Hudson commented on HBASE-6757:

Integrated in HBase-0.94-security-on-Hadoop-23 #8 (See [https://builds.apache.org/job/HBase-0.94-security-on-Hadoop-23/8/])
    HBASE-6757 Very inefficient behaviour of scan using FilterList (Revision 1383749)

     Result = FAILURE
larsh : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/filter/FilterList.java

> 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, 0.96.0
>         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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