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https://issues.apache.org/jira/browse/HBASE-2302?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-2302:
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Fix Version/s: 0.20.5
(was: 0.20.4)
> 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: 0.20.5, 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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