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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8063) Filter HFiles based on first/last key
Date Tue, 12 Mar 2013 05:35:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13599723#comment-13599723
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chunhui shen commented on HBASE-8063:
-------------------------------------

I am prefered to the first choice, 

using KeyValue#createFirstOnRow and KeyValue#createLastOnRow to create KeyValue per startRow/stopRow

{code}
+    assertEquals(accessedFiles.size(), expectedCount);
{code}
Changed to assertEquals(expectedCount,accessedFiles.size());
                
> Filter HFiles based on first/last key
> -------------------------------------
>
>                 Key: HBASE-8063
>                 URL: https://issues.apache.org/jira/browse/HBASE-8063
>             Project: HBase
>          Issue Type: Improvement
>          Components: Scanners
>    Affects Versions: 0.98.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HBASE-8063.txt, HBASE-8063-v2.txt
>
>
> # hbase-5010 introduced a filter mechanism based on timerange hint
> # this jira is a placeholder just for keyrange hint: currently, low layer(hfile reader)
has first/last key getter methods already. we should utilize this information to pre-filte
hfiles while choosing scanners from storefiles.
> It's just a raw thought right now, no patch available yet. I'll summit a patch asap if
it's reasonable, welcome to give some suggestions/comments:)

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