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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6870) HTable#coprocessorExec always scan the whole table
Date Wed, 04 Sep 2013 21:25:55 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Hsieh updated HBASE-6870:
----------------------------------

    Description: 
In current logic, HTable#coprocessorExec always scans the entire META table, loading it into
memory and then filters the keys to return only those that fall in specified range.  The version
after the patch only scans the portions of meta that are in the specified key range, and returns
them.  Put simply -- before we did a load-all-then-filter; afterwards we only-scan-what-is-needed.

The former has low efficiency and greatly impacts the Regionserver carrying .META. when there
are many coprocessorExec requests.



  was:
In current logic, HTable#coprocessorExec always scans the entire META table, loading it into
memory and then filters the keys to return only those that fall in specified range.  The version
after the patch only scans the portions of meta that are in the specified key range, and returns
them.  Put simply -- before we did a load-all-then-filter; afterwards we only-scan-what-is-needed.

The former has low efficiency, and greatly impacts the Regionserver carrying .META. when there
are many coprocessorExec requests.



    
> 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: 0.98.0, 0.94.8, 0.95.1
>
>         Attachments: 6870-v4.txt, hbase-0.94-6870v6.patch, hbase-0.95-6870v6.patch, HBASE-6870.patch,
HBASE-6870-testPerformance.patch, HBASE-6870v2.patch, HBASE-6870v3.patch, hbase-6870v5.patch,
hbase-6870v6.patch
>
>
> In current logic, HTable#coprocessorExec always scans the entire META table, loading
it into memory and then filters the keys to return only those that fall in specified range.
 The version after the patch only scans the portions of meta that are in the specified key
range, and returns them.  Put simply -- before we did a load-all-then-filter; afterwards we
only-scan-what-is-needed.
> The former has low efficiency and greatly impacts the Regionserver carrying .META. when
there are many coprocessorExec requests.

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