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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2302) Optimize M-R by bulk excluding regions - less InputSplit-s to avoid traffic on region servers when performing M-R on a subset of the table
Date Thu, 11 Mar 2010 23:56:27 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-2302:
-------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

Committed branch and trunk.  Thanks for the patch Kay Kay.

> Optimize M-R by bulk excluding regions - less InputSplit-s  to avoid traffic on region
servers when performing M-R on a subset of the table
> -------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2302
>                 URL: https://issues.apache.org/jira/browse/HBASE-2302
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.3
>            Reporter: Kay Kay
>            Priority: Minor
>             Fix For: 0.20.4, 0.21.0
>
>         Attachments: HBASE-2302.patch, HBASE-2302.patch
>
>
> TableInputFormatBase , creates a InputSplit per region. Given that  the keys are sorted
- sometimes -  it might be needed to perform M-R on a subset of the keyset ( regions ) . Adding
a provision to filter the regions when generating InputSplits might be useful . 
> The granularity of exclusion is per-region-wise. A RowFilter might still be needed during
a Scan on a separate region, but that is a separate issue altogether. 
> Methodology: Add a way to prune the keyset before generating inputsplits , by default
- all sets are returned indicating all regions are included that could be overridden as necessary,
depending on the higher-level logic.  

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