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Posted to user@hbase.apache.org by Brian Jeltema <br...@digitalenvoy.net> on 2014/07/20 17:52:39 UTC
determining which region a mapper processed
When a MapReduce job is run against HBase, a mapper is created for each region (using TableInputFormat).
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?
TIA
Brian
Re: determining which region a mapper processed
Posted by Ted Yu <yu...@gmail.com>.
You shouldn't rely on mapper number.
Each mapper can log the first key it processes.
Cheers
On Jul 20, 2014, at 7:52 AM, Brian Jeltema <br...@digitalenvoy.net> wrote:
> When a MapReduce job is run against HBase, a mapper is created for each region (using TableInputFormat).
> 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?
>
> TIA
> Brian