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Hive, mail # user - Modify the number of map tasks


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Re: Modify the number of map tasks
imen Megdiche 2012-12-12, 11:41
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 <[EMAIL PROTECTED]>

> 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 <[EMAIL PROTECTED]>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
>>
>
>