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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6870) HTable#coprocessorExec always scan the whole table
Date Sun, 07 Apr 2013 02:59:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13624599#comment-13624599
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chunhui shen commented on HBASE-6870:
-------------------------------------

bq.How come useCache being true gets translated into includeEndKey being true ?
The useCache flag is not related with includeEndKey, includeEndKey is always true in HTable#coprocessorService.

bq.I wonder if we should provide a mechanism for coprocessors to specify whether fresh .META.
scan is wanted.
Making a useCache flag is used for performance comparision in my initial purpose, I think
there's no necessary to provide a choice for fresh .META. scan since it is still able to get
a invalid region location from the .META.
                
> HTable#coprocessorExec always scan the whole table 
> ---------------------------------------------------
>
>                 Key: HBASE-6870
>                 URL: https://issues.apache.org/jira/browse/HBASE-6870
>             Project: HBase
>          Issue Type: Improvement
>          Components: Coprocessors
>    Affects Versions: 0.94.1, 0.95.0, 0.95.2
>            Reporter: chunhui shen
>            Assignee: chunhui shen
>            Priority: Critical
>             Fix For: 0.95.1, 0.98.0
>
>         Attachments: 6870-v4.txt, HBASE-6870.patch, HBASE-6870-testPerformance.patch,
HBASE-6870v2.patch, HBASE-6870v3.patch, hbase-6870v5.patch
>
>
> In current logic, HTable#coprocessorExec always scan the whole table, its efficiency
is low and will affect the Regionserver carrying .META. under large coprocessorExec requests

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