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From George Datskos <george.dats...@jp.fujitsu.com>
Subject Re: How to get the number of node in cluster?
Date Wed, 26 Sep 2012 06:06:16 GMT
Hey Jason,

This should return the number of active tasktrackers in the cluster:
int numNodes = new JobClient(conf).getClusterStatus().getTaskTrackers()



> Hi, all
>
> As I have to run my MapReduce program on clusters of different size, 
> and I would like the reducer number adapt to (0.95 * NodeNo. * 
> mapred.tasktracker.reduce.tasks.maximum) automatically, so I was 
> wondering how to get get the number of node in cluster in a MapReduce Job?
>
> -- 
> YANG, Lin
>


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