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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5520) Support reseek() at RegionScanner
Date Fri, 16 Mar 2012 05:13:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5520?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230900#comment-13230900
] 

Lars Hofhansl commented on HBASE-5520:
--------------------------------------

Have been thinking a bit more about this.

I think if we allow the caller just to pass a rowkey, and then enforce the we only seek forward
this would be a great feature to have.
Since we're operation at the level of a region scanner (where we think about regions, rather
than stores) this would be the right abstraction too.

Alternatively looking at the MemstoreScanner code, seeking backwards would just be a no-op,
so that is another option.

Sorry, didn't mean to be dis-encouraging before just cautious :)
                
> Support reseek() at RegionScanner
> ---------------------------------
>
>                 Key: HBASE-5520
>                 URL: https://issues.apache.org/jira/browse/HBASE-5520
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Anoop Sam John
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.96.0
>
>         Attachments: HBASE-5520_1.patch, HBASE-5520_2.patch, HBASE-5520_3.patch
>
>
> reseek() is not supported currently at the RegionScanner level. We can support the same.
> This is created following the discussion under HBASE-2038

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