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From Michael Segel <michael_se...@hotmail.com>
Subject Re: Can I make use of TableSplit across Regions to make my MR job faster?
Date Mon, 26 Aug 2013 10:48:50 GMT
A 'table split' is a region split and as you split regions, balance the regions, you should
see some parallelism in your M/R jobs. 

Of course depending on your choice of row keys... YMMV.



On Aug 26, 2013, at 2:16 AM, Pavan Sudheendra <pavan0591@gmail.com> wrote:

> Hi all,
> How to make use of a TableSplit or a Region Split? How is it used in
> TableInputFormatBase#
> getSplits() ?
> I have 6 Region Servers across the cluster for the map-reduce task which i
> am using, How to leverage this so that the table is split across the
> clusters and the map-reduce application finishes fast.. Right now, it is
> very slow.. For aggregating 3 table values, 1 with 100,000 rows and other
> two tables i'm only using get operating to get the value by passing the
> key.. For this setup, it takes 40-50 mins.. Which is worse.. The first
> table would eventually be around 20-25m rows.. Please lead me in the right
> way.. I will paste the code if anybody is interested.
> -- 
> Regards-
> Pavan

The opinions expressed here are mine, while they may reflect a cognitive thought, that is
purely accidental. 
Use at your own risk. 
Michael Segel
michael_segel (AT) hotmail.com

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