[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

["Kay Kay (JIRA)" <ji...@apache.org>]

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

Kay Kay updated HBASE-2302:
---------------------------

    Affects Version/s: 0.20.3
        Fix Version/s: 0.20.4
              Summary: 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  (was: 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)

This does not break any compatibility - so would be a nice-to-have for 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
>             Fix For: 0.20.4
>
>         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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