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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2438) Addition of a Column Pagination Filter
Date Wed, 14 Apr 2010 17:36:50 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12856977#action_12856977
] 

Jonathan Gray commented on HBASE-2438:
--------------------------------------

Patch looks good, just some nitpicks.

- Take out cleanup changes made to TestSingleColumnValueFilter (your patch otherwise does
not touch this file so doesn't belong in this patch)
- TestColumnPaginationFilter has a copyright header from your company.  This should be removed
and replaced with the apache license.
- ColumnPaginationFilter should be given an apache copyright header as well.

Otherwise, this looks good.  Haven't run unit tests yet but will try to get to that tonight.

Good stuff Paul.

> Addition of a Column Pagination Filter
> --------------------------------------
>
>                 Key: HBASE-2438
>                 URL: https://issues.apache.org/jira/browse/HBASE-2438
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: filters
>    Affects Versions: 0.20.3
>            Reporter: Paul Kist
>            Assignee: Paul Kist
>         Attachments: hbase-2438-0.20.3-v2.patch, hbase-2438-0.20.3.patch
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> Client applications may need to do pagination, depending on the number of columns returned,
it may be more efficient to perform pagination algorithms at the database level (similar to
SQL's LIMIT and OFFSET).  This will be an additional filter taking two parameters:
> - page
> - pageSize
> For every row, that gets returned, only a subset of columns are returned based on page
and pageSize
> If the page / pageSize column goes over the limits, then no results are returned from
the filter.
> A practical example for using a filter like this may be for folks doing Row-based indexing
with Hbase.

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