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From "Alex Baranau (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-2038) Coprocessors: Region level indexing
Date Tue, 07 Feb 2012 12:59:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202338#comment-13202338
] 

Alex Baranau commented on HBASE-2038:
-------------------------------------

Yeah, same thought here: use fast-forwarding filter (the one which provides hints for the
next row to forward to). I guess we can add such filter to a scan as a hook in open scan (on
region level) time. 

I guess ideally we'd want to add such filter for RegionScanner in postScannerOpen(). Though
RegionScanner interface does not exposes filters info. We could try to cast it to particular
class but it may be too unsafe.

Alternatively we could try to modify Scan object (add filters), but this is obviously too
bad approach as this object is reused across regions.

May be we can hear some advice from Coprocessor feature devs? ;)
                
> Coprocessors: Region level indexing
> -----------------------------------
>
>                 Key: HBASE-2038
>                 URL: https://issues.apache.org/jira/browse/HBASE-2038
>             Project: HBase
>          Issue Type: New Feature
>          Components: coprocessors
>            Reporter: Andrew Purtell
>            Priority: Minor
>
> HBASE-2037 is a good candidate to be done as coprocessor. It also serve as a good goalpost
for coprocessor environment design -- there should be enough of it so region level indexing
can be reimplemented as a coprocessor without any loss of functionality. 

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