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MapReduce >> mail # user >> Re: MAP_INPUT_RECORDS counter in the reducer


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Rahul Bhattacharjee 2013-09-18, 03:09
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Shahab Yunus 2013-09-18, 13:46
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Yaron Gonen 2013-09-20, 09:12
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MAP_INPUT_RECORDS counter in the reducer
Hi,
Is there a way for the reducer to get the total number of input records to
the map phase?
For example, I want the reducer to normalize a sum by dividing it in the
number of records. I tried getting the value of that counter by using the
line:

context.getCounter(Task.Counter.MAP_INPUT_RECORDS).getValue();

in the reducer code, but I got 0.

Thanks!
Yaron
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Shahab Yunus 2013-09-17, 13:49