Hi Pedro,
I can answer a couple of these.
On Tue, Jan 5, 2010 at 5:46 PM, psdc1978 wrote:
> 1 - What are the difference between the classes:
> org.apache.hadoop.mapred.Reducer.java and
> org.apache.hadoop.mapreduce.Reducer.java? In which case the 2 reducers
> are used?
>
> 2 - The same question
Hi list,
I downloaded the Hadoop 0.20.1 and now I'm looking to the source of
the MapReduce. I've got the following questions:
1 - What are the difference between the classes:
org.apache.hadoop.mapred.Reducer.java and
org.apache.hadoop.mapreduce.Reducer.java? In which case the 2 reducers
are used?
On Jan 5, 2010, at 9:13 AM, psdc1978 wrote:
1 - I would like to see what is output that the Maps is doing on my
example. Is it possible to put hadoop only running Map tasks,
excluding the Reduce tasks?
Set the number of reduce tasks to 0.
2 - The output of the Maps is written into a tempora
Hi,
1 - I would like to see what is output that the Maps is doing on my
example. Is it possible to put hadoop only running Map tasks,
excluding the Reduce tasks?
2 - The output of the Maps is written into a temporary file?
3 - How the output of the maps is passed to the reduce tasks? Is using
a
the number from Reduce output records Counter doesn't match its
actually # of records in the output files. although after reran it, it
did match. any idea what could be wrong?
Thanks,
Yonggang
