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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, 12:30
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2012/12/12 Mohammad Tariq <[EMAIL PROTECTED]>

> Any luck with "localhost:50030"??
>
> Regards,
>     Mohammad Tariq
>
>
>
> On Wed, Dec 12, 2012 at 5:53 PM, imen Megdiche <[EMAIL PROTECTED]>wrote:
>
>> 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
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>