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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, 12:23
i run the job through the command line
2012/12/12 Mohammad Tariq <[EMAIL PROTECTED]>

> You have to replace "JobTrackerHost" in "JobTrackerHost:50030" with the
> actual name of the machine where JobTracker is running. For example, If
> you are working on a local cluster, you have to use "localhost:50030".
>
> Are you running your job through the command line or some IDE?
>
> Regards,
>     Mohammad Tariq
>
>
>
> On Wed, Dec 12, 2012 at 5:42 PM, imen Megdiche <[EMAIL PROTECTED]>wrote:
>
>> excuse me the data size is 98 MB
>>
>>
>> 2012/12/12 imen Megdiche <[EMAIL PROTECTED]>
>>
>>> the size of data 49 MB and n of map 4
>>> the web UI JobTrackerHost:50030 does not wok, what should i do to make
>>> this appear , i work on ubuntu
>>>
>>>
>>> 2012/12/12 Mohammad Tariq <[EMAIL PROTECTED]>
>>>
>>>> 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 <[EMAIL PROTECTED]
>>>> > 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 <[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
>>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>