Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Plain View
Hive >> mail # user >> Modify the number of map tasks


+
imen Megdiche 2012-12-12, 10:41
+
Mohammad Tariq 2012-12-12, 11:04
+
imen Megdiche 2012-12-12, 11:41
+
Mohammad Tariq 2012-12-12, 12:06
+
imen Megdiche 2012-12-12, 12:11
+
imen Megdiche 2012-12-12, 12:12
Copy link to this message
-
Re: Modify the number of map tasks
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
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>
+
imen Megdiche 2012-12-12, 12:23
+
Mohammad Tariq 2012-12-12, 12:25
+
imen Megdiche 2012-12-12, 12:30
+
Mohammad Tariq 2012-12-12, 12:36
+
imen Megdiche 2012-12-12, 12:44
+
Mohammad Tariq 2012-12-12, 12:53
+
imen Megdiche 2012-12-12, 13:01
+
Mohammad Tariq 2012-12-12, 13:07
+
imen Megdiche 2012-12-12, 13:16
+
Mohammad Tariq 2012-12-12, 13:22
+
imen Megdiche 2012-12-12, 13:38
+
Mohammad Tariq 2012-12-12, 13:48
+
imen Megdiche 2012-12-12, 14:01
+
Mohammad Tariq 2012-12-12, 14:07
+
imen Megdiche 2012-12-12, 14:15
+
Mohammad Tariq 2012-12-12, 14:48
+
imen Megdiche 2012-12-12, 15:25
+
Mohammad Tariq 2012-12-12, 15:37