[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 schema

["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:
---------------------------

    Attachment: HBASE-2302.patch

*  add a method TableInputFormatBase.java#getPrunedKeys , where the user can prune the list of keys on which M-R needs to be applied to reduce the number of InputSplit . 

Very non-intrusive, but probably not the most API friendly. 

TODO: unit tests as necessary 

> 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
> --------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2302
>                 URL: https://issues.apache.org/jira/browse/HBASE-2302
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Kay Kay
>         Attachments: 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.  

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.