Hi
You can create your own counters like
enum CountFruits {
Apple,
Mango,
Banana
}
And in your mapper class when you see condition to increment , you can use
Reporter incrCounter method to do the same.
http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapred/Reporter.html#incrCounter(java.lang.Enum,%20long)
e.g
// I saw Apple increment it by one
reporter.incrCounter(CountFruits.Apple,1);
Now you can access them using job.getCounters
http://hadoop.apache.org/common/docs/current/api/org/apache/hadoop/mapreduce/Job.html#getCounters()
Hope this helps
Regards,
Jagat Singh
On Fri, Apr 20, 2012 at 9:43 PM, Gayatri Rao <rgayat...@gmail.com> wrote:
> Hi All,
>
> Is there a way for me to set global counters in Mapper and access them from
> reducer?
> Could you suggest how I can acheve this?
>
> Thanks
> Gayatri
>
