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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6577) RegionScannerImpl.nextRow() should seek to next row
Date Tue, 14 Aug 2012 05:11:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433898#comment-13433898
] 

Lars Hofhansl commented on HBASE-6577:
--------------------------------------

@Ram: I see.

I think filters and coprocessors should be kept separately. There are many places where filters
fast forward and if we decorate all those points with a CP hooks we'd slow things down again.
If one needs to hook into fast forward seeking with a CP hook I think one should use the reseek
that you added RegionScanner from within a coprocessor instead of a filter.
(I hope I unserstood the comment correctly).
So from that viewpoint I would find it weird to place a CP hook inside of filter fast forward
optimization code.
                
> RegionScannerImpl.nextRow() should seek to next row
> ---------------------------------------------------
>
>                 Key: HBASE-6577
>                 URL: https://issues.apache.org/jira/browse/HBASE-6577
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 6577.txt
>
>
> RegionScannerImpl.nextRow() is called when a filter filters the entire row. In that case
we should seek to the next row rather then iterating over all versions of all columns to get
there.

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