Can access it via the Job API?
http://hadoop.apache.org/mapreduce/docs/current/api/org/apache/hadoop/mapreduce/Job.html#getCounters%28%29
> Hi,
> I have a similar query.
>
> Infact, I sent it yesterday and waiting for anybody's response who might
> have done it.
>
>
> Thanks,
> Anurag Tangri
>
> 2011/11/30 rabbit_cheng <rabbit_ch...@126.com>
>
> > I have created a counter in mapper to count something, I wanna get the
> >
> > counter's value in reducer phase, the code segment is as follow:
> >
> > public class MM extends Mapper<LongWritable, Text, Text, Text> {
> >
> > static enum TEST{ pt }
> > @Override
> > public void map(LongWritable key, Text values, Context context)
> > throws
> >
> > IOException, InterruptedException {
> >
> > context.getCounter(TEST.pt).increment(1);
> >
> > }
> >
> > }
> > public class KMeansReducer extends Reducer<Text, Text, Text, Text> {
> >
> > @Override
> > protected void setup(Context context) throws IOException,
> >
> > InterruptedException {
> >
> > long ptValue=context.getCounter(MM.TEST.pt <http://mm.test.pt/>
> >
> > ).getValue();
> >
> > }
> >
> > }
> > but what I get is always 0, i.e., the value of variable ptValue is always
> > 0.
> > Does anybody know how to access a mapper counter in reducer?
