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From "Kay Kay (JIRA)" <j...@apache.org>
Subject [jira] Created: (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 schema
Date Tue, 09 Mar 2010 03:53:27 GMT
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 schema
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                 Key: HBASE-2302
                 URL: https://issues.apache.org/jira/browse/HBASE-2302
             Project: Hadoop HBase
          Issue Type: Improvement
            Reporter: Kay Kay


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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