Hi Imen,
You can visit the MR web UI at "JobTrackerHost:50030" and see all the
useful information like no. of mappers, no of reducers, time taken for the
execution etc.
One quick question for you, what is the size of your data and what is the
no of maps which you are getting right now?
Regards,
Mohammad Tariq
On Wed, Dec 12, 2012 at 5:11 PM, imen Megdiche <imen.megdi...@gmail.com>wrote:
> Thank you Mohammad but the number of map tasks still the same in the
> execution. Do you know how to capture the time spent on execution.
>
>
> 2012/12/12 Mohammad Tariq <donta...@gmail.com>
>
>> Hi Imen,
>>
>> You can add "mapred.map.tasks" property in your mapred-site.xml file.
>>
>> But, it is just a hint for the InputFormat. Actually no. of maps is
>> actually determined by the no of InputSplits created by the InputFormat.
>>
>> HTH
>>
>> Regards,
>> Mohammad Tariq
>>
>>
>>
>> On Wed, Dec 12, 2012 at 4:11 PM, imen Megdiche
>> <imen.megdi...@gmail.com>wrote:
>>
>>> Hi,
>>>
>>> I try to force the number of map for the mapreduce job with the command
>>> :
>>> public static void main(String[] args) throws Exception {
>>>
>>> JobConf conf = new JobConf(WordCount.class);
>>> conf.set("mapred.job.tracker", "local");
>>> conf.set("fs.default.name", "local");
>>> conf.setJobName("wordcount");
>>>
>>> conf.setOutputKeyClass(Text.class);
>>> conf.setOutputValueClass(IntWritable.class);
>>>
>>> conf.setNumMapTask(6);
>>> conf.setMapperClass(Map.class);
>>> conf.setCombinerClass(Reduce.class);
>>> conf.setReducerClass(Reduce.class);
>>> ...
>>> }
>>>
>>> But it doesn t work.
>>> What can i do to modify the number of map and reduce tasks.
>>>
>>> Thank you
>>>
>>
>>
>
