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From Ted Yu <yuzhih...@gmail.com>
Subject Re: determining which region a mapper processed
Date Sun, 20 Jul 2014 17:15:40 GMT
You shouldn't rely on mapper number. 

Each mapper can log the first key it processes. 


On Jul 20, 2014, at 7:52 AM, Brian Jeltema <brian.jeltema@digitalenvoy.net> wrote:

> When  a MapReduce job is run against HBase, a mapper is created for each region (using
> Is there a way look at the history and determine which region a given mapper ran against?
Or can I rely on 
> the mapper number being the same as the region number?
> Brian

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